NSRunLoop和NSTimer

青旅半醒 2022-08-21 01:08 186阅读 0赞

**在使用NSTimer的时候遇到过到了设定的时间NSTimer指定的方法不执行的情况,发现调用NSTimer不是在主线程,需要将NSTimer添加到NSRunloop中。下面[特酷吧][Link 1]根据自己实际开发总结使用NSTimer需要注意的问题.**

**一,调用NSTimer会对调用的对象retain**

**不管是重复的NSTimer还是一次性的NSTimer都会对创建该NSTimer的对象进行retain操作。一次性的NSTimer会在设定时间到来时完成调用然后将自己invalidate,而重复性的[NSTimer][]只有开发者调用invalidate时才会停止。鉴于此,在使用NSTimerd的时候一定不要忘记在恰当的时候执行invalidate操作,否则对于不执行invalidate操作的重复性NSTimer的,会造成对象不能释放,发生内存泄漏。**

**二,NSTimer必须加入NSRunloop中才能正确执行**

**如果在非主线程的线程中只是创建一个NSTimer并启动,该NSTimer是不会执行的,除非将NSTimer加入到该线程的NSRunloop中,并启动NSRunloop才行。示例如下:**

**\[\[NSRunLoop currentRunLoop\] addTimer:timer forMode:NSDefaultRunLoopMode\];   **

**\[\[NSRunLoop currentRunLoop\] run\]\]; **

**\[\[NSRunLoop currentRunLoop\] runUntilDate:\[NSDate dateWithTimeIntervalSinceNow:3\]\];**

**也许有朋友会说:我在主线程中创建了NSTimer,也并没有加入NSRunloop中,怎么就能正确执行呢?这是因为主线程默认创建好了NSRunloop,如果你使用如下方法打印主线程的NSRunloop信息会看到主线程的NSRunloop里面的信息非常多,是默认创建好的。**

**NSLog(@"main Runloop %@",\[NSRunLoop mainRunLoop\]);**

**\{wakeup port = 0x1e03, stopped = false, ignoreWakeUps = true,**

**current mode = GSEventReceiveRunLoopMode,**

**common modes = \{type = mutable set, count = 2,**

**entries =>**

**    0 : \{contents = "UITrackingRunLoopMode"\}**

**    1 : \{contents = "kCFRunLoopDefaultMode"\}**

**\}**

**除了主线程之外,其他线程的NSRunloop只有在调用\[NSRunloop currentRunloop\]才会创建。**

**三,NSTimer一定准确么?**

**NSTimer其实并不是一个实时的系统,正常情况下它能按照指定的周期触发,但如果当前线程有阻塞的时候会延迟执行,在延迟超过一个周期时会和下一个触发合并在下一个触发时刻执行。除此之外,多线程程序实际上也是要在CPU的处理上同步进行,操作系统并不能保证多线程严格同步。一个很典型的场景就是:如果我们定义一个一秒周期的定时器,希望它保持一秒计数,当计时的时间越来越长的时候,误差会越来越大。**

**四,如何在使NSTimer在后台也能执行?**

**正常情况下,NSTimer会在应用进入后台时停止工作,进入前台时又重新计时。那么怎么使NSTimer在后台也能执行呢?**

**要完成这个需求,就要借助苹果上的音频播放类在后台执行的这个特权。具体操作方法如下:**

**在Info.plist中，添加"Required background modes"数组键，设置一个元素为"App plays audio".**

**在\- (BOOL)application:(UIApplication \*)application didFinishLaunchingWithOptions:(NSDictionary \*)launchOptions方法中添加:**

**NSError \*err = nil;**

**\[\[AVAudioSession sharedInstance\]setCategory: AVAudioSessionCategoryPlayback error: &err\];**

**\[\[AVAudioSession sharedInstance\]setActive: YES error: &err\];**

**再添加如下方法:**

**折叠C/C++ Code复制内容到剪贴板**

*  **- (void)applicationDidEnterBackground:(UIApplication \*)application\{  **
 *  **    UIApplication\*   app = \[[UIApplication][] sharedApplication\];  **
 *  **    \_\_block    UIBackgroundTaskIdentifier bgTask;  **
 *  **    bgTask = \[app beginBackgroundTaskWithExpirationHandler:^\{  **
 *  **        dispatch\_async(dispatch\_get\_main\_queue(), ^\{  **
 *  **            if (bgTask != UIBackgroundTaskInvalid)  **
 *  **            \{  **
 *  **                bgTask = UIBackgroundTaskInvalid;  **
 *  **            \}  **
 *  **        \});  **
 *  **    \}\];  **
 *  **    dispatch\_async(dispatch\_get\_global\_queue(DISPATCH\_QUEUE\_PRIORITY\_DEFAULT, 0), ^\{  **
 *  **        dispatch\_async(dispatch\_get\_main\_queue(), ^\{  **
 *  **            if (bgTask != UIBackgroundTaskInvalid)  **
 *  **            \{  **
 *  **                bgTask = UIBackgroundTaskInvalid;  **
 *  **            \}  **
 *  **        \});  **
 *  **    \});  **
 *  **\}  **

**还有一种牺牲页面流畅性的方法，直接在主线程中，提高timer的runloop权限，不过建议为了用户体验，还是放弃这种方法。**

**    if (nil == self.updateTimer)**

**    \{**

**    self.updateTimer = \[NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(updateTime) userInfo:nil repeats:YES\];**

**        \[\[NSRunLoop currentRunLoop\] addTimer:self.updateTimer forMode:NSRunLoopCommonModes\];**

**    \}**

## 一、什么是NSRunLoop ##

NSRunLoop是消息机制的处理模式

NSRunLoop的作用在于有事情做的时候使的当前NSRunLoop的线程工作，没有事情做让当前NSRunLoop的线程休眠

NSTimer默认添加到当前NSRunLoop中，也可以手动制定添加到自己新建的NSRunLoop

NSRunLoop就是一直在循环检测，从线程start到线程end，检测inputsource(如点击，双击等操作)同步事件，检测timesource同步事件，检测到输入源会执行处理函数，首先会产生通知，corefunction向线程添加runloop observers来监听事件，意在监听事件发生时来做处理。

在单线程的app中，不需要注意Run Loop，但不代表没有。程序启动时，系统已经在主线程中加入了Run Loop。它保证了我们的主线程在运行起来后，就处于一种“等待”的状态（而不像一些命令行程序一样运行一次就结束了），这个时候如果有接收到的事件（Timer的定时到了或是其他线程的消息），就会执行任务，否则就处于休眠状态。

runloopmode是一个集合，包括监听：事件源，定时器，以及需通知的runloop observers

模式包括：

*  default模式：几乎包括所有输入源(除NSConnection) NSDefaultRunLoopMode模式
 *  mode模式：处理modal panels
 *  connection模式：处理NSConnection事件，属于系统内部，用户基本不用
 *  event tracking模式：如组件拖动输入源 UITrackingRunLoopModes 不处理定时事件
 *  common modes模式：NSRunLoopCommonModes 这是一组可配置的通用模式。将input sources与该模式关联则同时也将input sources与该组中的其它模式进行了关联。

每次运行一个run loop，你指定（显式或隐式）run loop的运行模式。当相应的模式传递给run loop时，只有与该模式对应的input sources才被监控并允许run loop对事件进行处理（与此类似，也只有与该模式对应的observers才会被通知）

例：

1).在timer与table同时执行情况，当拖动table时，runloop进入UITrackingRunLoopModes模式下，不会处理定时事件，此时timer不能处理，所以此时将timer加入到NSRunLoopCommonModes模式(addTimer forMode)

2).在scroll一个页面时来松开，此时connection不会收到消息，由于scroll时runloop为UITrackingRunLoopModes模式，不接收输入源，此时要修改connection的mode

关于-(BOOL)runMode:(NSString \*)mode beforeDate:(NSDate \*)date;方法

指定runloop模式来处理输入源，首个输入源或date结束退出。

暂停当前处理的流程，转而处理其他输入源，当date设置为\[NSDate distantFuture\](将来，基本不会到达的时间)，所以除非处理其他输入源结束，否则永不退出处理暂停的当前处理的流程。

<table style="border-spacing:0px; border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; border-collapse:collapse!important; width:auto!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
 <tbody style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
  <tr style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
   <td style="border-top-width:0px!important; border-right-width:0px!important; border-bottom-width:0px!important; border-left-style:none!important; border-color:initial!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px 0px 0px 0.5em!important; vertical-align:top!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; word-break:break-all!important; color:rgb(185,189,182)!important; background:none!important"> <code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; font-weight:bold!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(0,255,255)!important; background:none!important">while</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">(A){ </code></td> 
  </tr> 
 </tbody> 
</table>

<table style="border-spacing:0px; border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; border-collapse:collapse!important; width:auto!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
 <tbody style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
  <tr style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
   <td style="border-top-width:0px!important; border-right-width:0px!important; border-bottom-width:0px!important; border-left-style:none!important; border-color:initial!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px 0px 0px 0.5em!important; vertical-align:top!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; word-break:break-all!important; color:rgb(185,189,182)!important; background:none!important"> <code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; background:none!important">&nbsp;</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">[[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:[NSDate distantFuture]];</code></td> 
  </tr> 
 </tbody> 
</table>

当前A为YES时，当前runloop会一直接收处理其他输入源，当前流程不继续处理，出为A为NO，当前流程继续

performSelector关于内存管理的执行原理是这样的执行 \[self performSelector:@selector(method1:) withObject:self.tableLayer afterDelay:3\]; 的时候，系统会将tableLayer的引用计数加1，执行完这个方法时，还会将tableLayer的引用计数减1，由于延迟这时tableLayer的引用计数没有减少到0，也就导致了切换场景dealloc方法没有被调用，出现了内存泄露。

利用如下函数：

\[NSObject cancelPreviousPerformRequestsWithTarget:self\]

当然你也可以一个一个得这样用：

\[NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(method1:) object:nil\]

加上了这个以后，顺利地执行了dealloc方法

在touchBegan里面

\[self performSelector:@selector(longPressMethod:) withObject:nil afterDelay:longPressTime\]

然后在end 或cancel里做判断，如果时间不够长按的时间调用：

\[NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(longPressMethod:) object:nil\]

取消began里的方法

## 二、Run Loop和线程的关系： ##

1. 主线程的run loop默认是启动的，用于接收各种输入sources

2. 对第二线程来说，run loop默认是没有启动的，如果你需要更多的线程交互则可以手动配置和启动，如果线程执行一个长时间已确定的任务则不需要。

## 三、Run Loop什么情况下使用： ##

1.  使用ports 或 input sources 和其他线程通信   // 不了解
2.  在线程中使用timers                                             // 如果不启动run loop，timer的事件是不会响应的
3.  在Cocoa 应用中使用performSelector…方法   // 应该是performSelector…这种方法会启动一个线程并启动run loop吧
4.  让线程执行一个周期性的任务

注：timer的创建和释放必须在同一线程中。  
\[\[NSRunLoop currentRunLoop\] addTimer:timer forMode:NSRunLoopCommonModes\];  此方法会retain timer对象的引用计数。

## 四、关于NSTimer ##

### 1、NSTimer会是准时触发事件吗 ###

答案是否定的，而且有时候你会发现实际的触发时间跟你想象的差距还比较大。NSTimer不是一个实时系统，因此不管是一次性的还是周期性的timer的实际触发事件的时间可能都会跟我们预想的会有出入。差距的大小跟当前我们程序的执行情况有关系，比如可能程序是多线程的，而你的timer只是添加在某一个线程的runloop的某一种指定的runloopmode中，由于多线程通常都是分时执行的，而且每次执行的mode也可能随着实际情况发生变化。

假设你添加了一个timer指定2秒后触发某一个事件，但是签好那个时候当前线程在执行一个连续运算(例如大数据块的处理等)，这个时候timer就会延迟到该连续运算执行完以后才会执行。重复性的timer遇到这种情况，如果延迟超过了一个周期，则会和后面的触发进行合并，即在一个周期内只会触发一次。但是不管该timer的触发时间延迟的有多离谱，他后面的timer的触发时间总是倍数于第一次添加timer的间隙。

原文如下：

> A repeating timer reschedules itself based on the scheduled firing time, not the actual firing time. For example, if a timer is scheduled to fire at a particular time and every 5 seconds after that, the scheduled firing time will always fall on the original 5 second time intervals, even if the actual firing time gets delayed. If the firing time is delayed so far that it passes one or more of the scheduled firing times, the timer is fired only once for that time period; the timer is then rescheduled, after firing, for the next scheduled firing time in the future.

下面请看一个简单的例子:

<table style="border-spacing:0px; border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; border-collapse:collapse!important; width:auto!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
 <tbody style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
  <tr style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
   <td style="border-top-width:0px!important; border-right-width:0px!important; border-bottom-width:0px!important; border-left-style:none!important; border-color:initial!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px 0px 0px 0.5em!important; vertical-align:top!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; word-break:break-all!important; color:rgb(185,189,182)!important; background:none!important"> <code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">- (</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; font-weight:bold!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(0,255,255)!important; background:none!important">void</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">)applicationDidBecomeActive:(UIApplication *)application&nbsp;</code></td> 
  </tr> 
 </tbody> 
</table>

<table style="border-spacing:0px; border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; border-collapse:collapse!important; width:auto!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
 <tbody style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
  <tr style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
   <td style="border-top-width:0px!important; border-right-width:0px!important; border-bottom-width:0px!important; border-left-style:none!important; border-color:initial!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px 0px 0px 0.5em!important; vertical-align:top!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; word-break:break-all!important; color:rgb(185,189,182)!important; background:none!important"> <code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; background:none!important">&nbsp;&nbsp;&nbsp;&nbsp;</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">SvTestObject *testObject2 = [[SvTestObject alloc] init];&nbsp;</code></td> 
  </tr> 
 </tbody> 
</table>

<table style="border-spacing:0px; border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; border-collapse:collapse!important; width:auto!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
 <tbody style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
  <tr style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
   <td style="border-top-width:0px!important; border-right-width:0px!important; border-bottom-width:0px!important; border-left-style:none!important; border-color:initial!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px 0px 0px 0.5em!important; vertical-align:top!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; word-break:break-all!important; color:rgb(185,189,182)!important; background:none!important"> <code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; background:none!important">&nbsp;&nbsp;&nbsp;&nbsp;</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">[NSTimer scheduledTimerWithTimeInterval:1 target:testObject2 selector:@selector(timerAction:) userInfo:nil repeats:YES];&nbsp;</code></td> 
  </tr> 
 </tbody> 
</table>

<table style="border-spacing:0px; border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; border-collapse:collapse!important; width:auto!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
 <tbody style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
  <tr style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
   <td style="border-top-width:0px!important; border-right-width:0px!important; border-bottom-width:0px!important; border-left-style:none!important; border-color:initial!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px 0px 0px 0.5em!important; vertical-align:top!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; word-break:break-all!important; color:rgb(185,189,182)!important; background:none!important"> <code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; background:none!important">&nbsp;&nbsp;&nbsp;&nbsp;</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">[testObject2 release];&nbsp;</code></td> 
  </tr> 
 </tbody> 
</table>

<table style="border-spacing:0px; border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; border-collapse:collapse!important; width:auto!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
 <tbody style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
  <tr style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
   <td style="border-top-width:0px!important; border-right-width:0px!important; border-bottom-width:0px!important; border-left-style:none!important; border-color:initial!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px 0px 0px 0.5em!important; vertical-align:top!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; word-break:break-all!important; color:rgb(185,189,182)!important; background:none!important"> <code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; background:none!important">&nbsp;&nbsp;&nbsp;&nbsp;</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">NSLog(@</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(255,158,123)!important; background:none!important">"Simulate busy"</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">);&nbsp;</code></td> 
  </tr> 
 </tbody> 
</table>

<table style="border-spacing:0px; border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; border-collapse:collapse!important; width:auto!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
 <tbody style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
  <tr style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
   <td style="border-top-width:0px!important; border-right-width:0px!important; border-bottom-width:0px!important; border-left-style:none!important; border-color:initial!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px 0px 0px 0.5em!important; vertical-align:top!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; word-break:break-all!important; color:rgb(185,189,182)!important; background:none!important"> <code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; background:none!important">&nbsp;&nbsp;&nbsp;&nbsp;</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">[self performSelector:@selector(simulateBusy) withObject:nil afterDelay:3];&nbsp;</code></td> 
  </tr> 
 </tbody> 
</table>

<table style="border-spacing:0px; border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; border-collapse:collapse!important; width:auto!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
 <tbody style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
  <tr style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
   <td style="border-top-width:0px!important; border-right-width:0px!important; border-bottom-width:0px!important; border-left-style:none!important; border-color:initial!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px 0px 0px 0.5em!important; vertical-align:top!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; word-break:break-all!important; color:rgb(185,189,182)!important; background:none!important"> <code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">- (</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; font-weight:bold!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(0,255,255)!important; background:none!important">void</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">)simulateBusy&nbsp;</code></td> 
  </tr> 
 </tbody> 
</table>

<table style="border-spacing:0px; border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; border-collapse:collapse!important; width:auto!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
 <tbody style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
  <tr style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
   <td style="border-top-width:0px!important; border-right-width:0px!important; border-bottom-width:0px!important; border-left-style:none!important; border-color:initial!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px 0px 0px 0.5em!important; vertical-align:top!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; word-break:break-all!important; color:rgb(185,189,182)!important; background:none!important"> <code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; background:none!important">&nbsp;&nbsp;&nbsp;&nbsp;</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">NSLog(@</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(255,158,123)!important; background:none!important">"start simulate busy!"</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">);&nbsp;</code></td> 
  </tr> 
 </tbody> 
</table>

<table style="border-spacing:0px; border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; border-collapse:collapse!important; width:auto!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
 <tbody style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
  <tr style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
   <td style="border-top-width:0px!important; border-right-width:0px!important; border-bottom-width:0px!important; border-left-style:none!important; border-color:initial!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px 0px 0px 0.5em!important; vertical-align:top!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; word-break:break-all!important; color:rgb(185,189,182)!important; background:none!important"> <code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; background:none!important">&nbsp;&nbsp;&nbsp;&nbsp;</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">NSUInteger caculateCount = 0x0FFFFFFF;&nbsp;</code></td> 
  </tr> 
 </tbody> 
</table>

<table style="border-spacing:0px; border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; border-collapse:collapse!important; width:auto!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
 <tbody style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
  <tr style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
   <td style="border-top-width:0px!important; border-right-width:0px!important; border-bottom-width:0px!important; border-left-style:none!important; border-color:initial!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px 0px 0px 0.5em!important; vertical-align:top!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; word-break:break-all!important; color:rgb(185,189,182)!important; background:none!important"> <code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; background:none!important">&nbsp;&nbsp;&nbsp;&nbsp;</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">CGFloat uselessValue = 0;&nbsp;</code></td> 
  </tr> 
 </tbody> 
</table>

<table style="border-spacing:0px; border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; border-collapse:collapse!important; width:auto!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
 <tbody style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
  <tr style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
   <td style="border-top-width:0px!important; border-right-width:0px!important; border-bottom-width:0px!important; border-left-style:none!important; border-color:initial!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px 0px 0px 0.5em!important; vertical-align:top!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; word-break:break-all!important; color:rgb(185,189,182)!important; background:none!important"> <code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; background:none!important">&nbsp;&nbsp;&nbsp;&nbsp;</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; font-weight:bold!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(0,255,255)!important; background:none!important">for</code>&nbsp;<code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">(NSUInteger i = 0; i &lt; caculateCount; ++i) {&nbsp;</code></td> 
  </tr> 
 </tbody> 
</table>

<table style="border-spacing:0px; border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; border-collapse:collapse!important; width:auto!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
 <tbody style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
  <tr style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
   <td style="border-top-width:0px!important; border-right-width:0px!important; border-bottom-width:0px!important; border-left-style:none!important; border-color:initial!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px 0px 0px 0.5em!important; vertical-align:top!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; word-break:break-all!important; color:rgb(185,189,182)!important; background:none!important"> <code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; background:none!important">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">uselessValue = i / 0.3333;&nbsp;</code></td> 
  </tr> 
 </tbody> 
</table>

<table style="border-spacing:0px; border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; border-collapse:collapse!important; width:auto!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
 <tbody style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
  <tr style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
   <td style="border-top-width:0px!important; border-right-width:0px!important; border-bottom-width:0px!important; border-left-style:none!important; border-color:initial!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px 0px 0px 0.5em!important; vertical-align:top!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; word-break:break-all!important; color:rgb(185,189,182)!important; background:none!important"> <code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; background:none!important">&nbsp;&nbsp;&nbsp;&nbsp;</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">NSLog(@</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(255,158,123)!important; background:none!important">"finish simulate busy!"</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">);&nbsp;</code></td> 
  </tr> 
 </tbody> 
</table>

例子中首先开启了一个timer，这个timer每隔1秒调用一次target的timerAction方法，紧接着我们在3秒后调用了一个模拟线程繁忙的方法(其实就是一个大的循环)。运行程序后输出结果如下:

[![NSTimer输出结果][NSTimer 1]][NSTimer_NSTimer 1]

NSTimer输出结果

观察结果我们可以发现，当线程空闲的时候timer的消息触发还是比较准确的，但是在36分12秒开始线程一直忙着做大量运算，知道36分14秒该运算才结束，这个时候timer才触发消息，这个线程繁忙的过程超过了一个周期，但是timer并没有连着触发两次消息，而只是触发了一次。等线程忙完以后后面的消息触发的时间仍然都是整数倍与开始我们指定的时间，这也从侧面证明，timer并不会因为触发延迟而导致后面的触发时间发生延迟。

综上: timer不是一种实时的机制，会存在延迟，而且延迟的程度跟当前线程的执行情况有关。

### 2、NSTimer为什么要添加到RunLoop中才会有作用 ###

前面的例子中我们使用的是一种便利方法，它其实是做了两件事：首先创建一个timer，然后将该timer添加到当前runloop的default mode中。也就是这个便利方法给我们造成了只要创建了timer就可以生效的错觉，我们当然可以自己创建timer，然后手动的把它添加到指定runloop的指定mode中去。

NSTimer其实也是一种资源，如果看过多线程变成指引文档的话，我们会发现所有的source如果要起作用，就得加到runloop中去。同理timer这种资源要想起作用，那肯定也需要加到runloop中才会又效喽。如果一个runloop里面不包含任何资源的话，运行该runloop时会立马退出。你可能会说那我们APP的主线程的runloop我们没有往其中添加任何资源，为什么它还好好的运行。我们不添加，不代表框架没有添加，如果有兴趣的话你可以打印一下main thread的runloop，你会发现有很多资源。

下面我们看一个小例子：

<table style="border-spacing:0px; border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; border-collapse:collapse!important; width:auto!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
 <tbody style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
  <tr style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
   <td style="border-top-width:0px!important; border-right-width:0px!important; border-bottom-width:0px!important; border-left-style:none!important; border-color:initial!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px 0px 0px 0.5em!important; vertical-align:top!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; word-break:break-all!important; color:rgb(185,189,182)!important; background:none!important"> <code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">- (</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; font-weight:bold!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(0,255,255)!important; background:none!important">void</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">)applicationDidBecomeActive:(UIApplication *)application&nbsp;</code></td> 
  </tr> 
 </tbody> 
</table>

<table style="border-spacing:0px; border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; border-collapse:collapse!important; width:auto!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
 <tbody style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
  <tr style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
   <td style="border-top-width:0px!important; border-right-width:0px!important; border-bottom-width:0px!important; border-left-style:none!important; border-color:initial!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px 0px 0px 0.5em!important; vertical-align:top!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; word-break:break-all!important; color:rgb(185,189,182)!important; background:none!important"> <code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; background:none!important">&nbsp;&nbsp;&nbsp;&nbsp;</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">[self testTimerWithOutShedule];&nbsp;</code></td> 
  </tr> 
 </tbody> 
</table>

<table style="border-spacing:0px; border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; border-collapse:collapse!important; width:auto!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
 <tbody style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
  <tr style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
   <td style="border-top-width:0px!important; border-right-width:0px!important; border-bottom-width:0px!important; border-left-style:none!important; border-color:initial!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px 0px 0px 0.5em!important; vertical-align:top!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; word-break:break-all!important; color:rgb(185,189,182)!important; background:none!important"> <code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">- (</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; font-weight:bold!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(0,255,255)!important; background:none!important">void</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">)testTimerWithOutShedule&nbsp;</code></td> 
  </tr> 
 </tbody> 
</table>

<table style="border-spacing:0px; border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; border-collapse:collapse!important; width:auto!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
 <tbody style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
  <tr style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
   <td style="border-top-width:0px!important; border-right-width:0px!important; border-bottom-width:0px!important; border-left-style:none!important; border-color:initial!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px 0px 0px 0.5em!important; vertical-align:top!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; word-break:break-all!important; color:rgb(185,189,182)!important; background:none!important"> <code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; background:none!important">&nbsp;&nbsp;&nbsp;&nbsp;</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">NSLog(@</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(255,158,123)!important; background:none!important">"Test timer without shedult to runloop"</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">);&nbsp;</code></td> 
  </tr> 
 </tbody> 
</table>

<table style="border-spacing:0px; border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; border-collapse:collapse!important; width:auto!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
 <tbody style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
  <tr style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
   <td style="border-top-width:0px!important; border-right-width:0px!important; border-bottom-width:0px!important; border-left-style:none!important; border-color:initial!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px 0px 0px 0.5em!important; vertical-align:top!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; word-break:break-all!important; color:rgb(185,189,182)!important; background:none!important"> <code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; background:none!important">&nbsp;&nbsp;&nbsp;&nbsp;</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">SvTestObject *testObject3 = [[SvTestObject alloc] init];&nbsp;</code></td> 
  </tr> 
 </tbody> 
</table>

<table style="border-spacing:0px; border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; border-collapse:collapse!important; width:auto!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
 <tbody style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
  <tr style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
   <td style="border-top-width:0px!important; border-right-width:0px!important; border-bottom-width:0px!important; border-left-style:none!important; border-color:initial!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px 0px 0px 0.5em!important; vertical-align:top!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; word-break:break-all!important; color:rgb(185,189,182)!important; background:none!important"> <code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; background:none!important">&nbsp;&nbsp;&nbsp;&nbsp;</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">NSTimer *timer = [[NSTimer alloc] initWithFireDate:[NSDate dateWithTimeIntervalSinceNow:1] interval:1 target:testObject3 selector:@selector(timerAction:) userInfo:nil repeats:NO];&nbsp;</code></td> 
  </tr> 
 </tbody> 
</table>

<table style="border-spacing:0px; border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; border-collapse:collapse!important; width:auto!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
 <tbody style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
  <tr style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
   <td style="border-top-width:0px!important; border-right-width:0px!important; border-bottom-width:0px!important; border-left-style:none!important; border-color:initial!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px 0px 0px 0.5em!important; vertical-align:top!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; word-break:break-all!important; color:rgb(185,189,182)!important; background:none!important"> <code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; background:none!important">&nbsp;&nbsp;&nbsp;&nbsp;</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">[testObject3 release];&nbsp;</code></td> 
  </tr> 
 </tbody> 
</table>

<table style="border-spacing:0px; border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; border-collapse:collapse!important; width:auto!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
 <tbody style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
  <tr style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
   <td style="border-top-width:0px!important; border-right-width:0px!important; border-bottom-width:0px!important; border-left-style:none!important; border-color:initial!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px 0px 0px 0.5em!important; vertical-align:top!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; word-break:break-all!important; color:rgb(185,189,182)!important; background:none!important"> <code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; background:none!important">&nbsp;&nbsp;&nbsp;&nbsp;</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">NSLog(@</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(255,158,123)!important; background:none!important">"invoke release to testObject3"</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">);&nbsp;</code></td> 
  </tr> 
 </tbody> 
</table>

<table style="border-spacing:0px; border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; border-collapse:collapse!important; width:auto!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
 <tbody style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
  <tr style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
   <td style="border-top-width:0px!important; border-right-width:0px!important; border-bottom-width:0px!important; border-left-style:none!important; border-color:initial!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px 0px 0px 0.5em!important; vertical-align:top!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; word-break:break-all!important; color:rgb(185,189,182)!important; background:none!important"> <code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">- (</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; font-weight:bold!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(0,255,255)!important; background:none!important">void</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">)applicationWillResignActive:(UIApplication *)application&nbsp;</code></td> 
  </tr> 
 </tbody> 
</table>

<table style="border-spacing:0px; border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; border-collapse:collapse!important; width:auto!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
 <tbody style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
  <tr style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
   <td style="border-top-width:0px!important; border-right-width:0px!important; border-bottom-width:0px!important; border-left-style:none!important; border-color:initial!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px 0px 0px 0.5em!important; vertical-align:top!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; word-break:break-all!important; color:rgb(185,189,182)!important; background:none!important"> <code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; background:none!important">&nbsp;&nbsp;&nbsp;&nbsp;</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">NSLog(@</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(255,158,123)!important; background:none!important">"SvTimerSample Will resign Avtive!"</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">);&nbsp;</code></td> 
  </tr> 
 </tbody> 
</table>

这个小例子中我们新建了一个timer，为它指定了有效的target和selector，并指出了1秒后触发该消息，运行结果如下:

[![输出结果][20131128012234578-300x46.jpeg]][20131128012234578-300x46.jpeg 1]

输出结果

观察发现这个消息永远也不会触发，原因很简单，我们没有将timer添加到runloop中。

综上: 必须得把timer添加到runloop中，它才会生效。

### 3、NSTimer加到了RunLoop中但迟迟的不触发事件 ###

为什么明明添加了，但是就是不按照预先的逻辑触发事件呢？？？原因主要有以下两个:

1、runloop是否运行

每一个线程都有它自己的runloop，程序的主线程会自动的使runloop生效，但对于我们自己新建的线程，它的runloop是不会自己运行起来，当我们需要使用它的runloop时，就得自己启动。

那么如果我们把一个timer添加到了非主线的runloop中，它还会按照预期按时触发吗？下面请看一段测试程序:

<table style="border-spacing:0px; border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; border-collapse:collapse!important; width:auto!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
 <tbody style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
  <tr style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
   <td style="border-top-width:0px!important; border-right-width:0px!important; border-bottom-width:0px!important; border-left-style:none!important; border-color:initial!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px 0px 0px 0.5em!important; vertical-align:top!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; word-break:break-all!important; color:rgb(185,189,182)!important; background:none!important"> <code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">- (</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; font-weight:bold!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(0,255,255)!important; background:none!important">void</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">)applicationDidBecomeActive:(UIApplication *)application&nbsp;</code></td> 
  </tr> 
 </tbody> 
</table>

<table style="border-spacing:0px; border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; border-collapse:collapse!important; width:auto!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
 <tbody style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
  <tr style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
   <td style="border-top-width:0px!important; border-right-width:0px!important; border-bottom-width:0px!important; border-left-style:none!important; border-color:initial!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px 0px 0px 0.5em!important; vertical-align:top!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; word-break:break-all!important; color:rgb(185,189,182)!important; background:none!important"> <code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; background:none!important">&nbsp;&nbsp;&nbsp;&nbsp;</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">[NSThread detachNewThreadSelector:@selector(testTimerSheduleToRunloop1) toTarget:self withObject:nil];&nbsp;</code></td> 
  </tr> 
 </tbody> 
</table>

<table style="border-spacing:0px; border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; border-collapse:collapse!important; width:auto!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
 <tbody style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
  <tr style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
   <td style="border-top-width:0px!important; border-right-width:0px!important; border-bottom-width:0px!important; border-left-style:none!important; border-color:initial!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px 0px 0px 0.5em!important; vertical-align:top!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; word-break:break-all!important; color:rgb(185,189,182)!important; background:none!important"> <code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">- (</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; font-weight:bold!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(0,255,255)!important; background:none!important">void</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">)testTimerSheduleToRunloop1&nbsp;</code></td> 
  </tr> 
 </tbody> 
</table>

<table style="border-spacing:0px; border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; border-collapse:collapse!important; width:auto!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
 <tbody style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
  <tr style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
   <td style="border-top-width:0px!important; border-right-width:0px!important; border-bottom-width:0px!important; border-left-style:none!important; border-color:initial!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px 0px 0px 0.5em!important; vertical-align:top!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; word-break:break-all!important; color:rgb(185,189,182)!important; background:none!important"> <code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; background:none!important">&nbsp;&nbsp;&nbsp;&nbsp;</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];&nbsp;</code></td> 
  </tr> 
 </tbody> 
</table>

<table style="border-spacing:0px; border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; border-collapse:collapse!important; width:auto!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
 <tbody style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
  <tr style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
   <td style="border-top-width:0px!important; border-right-width:0px!important; border-bottom-width:0px!important; border-left-style:none!important; border-color:initial!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px 0px 0px 0.5em!important; vertical-align:top!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; word-break:break-all!important; color:rgb(185,189,182)!important; background:none!important"> <code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; background:none!important">&nbsp;&nbsp;&nbsp;&nbsp;</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">NSLog(@</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(255,158,123)!important; background:none!important">"Test timer shedult to a non-running runloop"</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">);&nbsp;</code></td> 
  </tr> 
 </tbody> 
</table>

<table style="border-spacing:0px; border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; border-collapse:collapse!important; width:auto!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
 <tbody style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
  <tr style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
   <td style="border-top-width:0px!important; border-right-width:0px!important; border-bottom-width:0px!important; border-left-style:none!important; border-color:initial!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px 0px 0px 0.5em!important; vertical-align:top!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; word-break:break-all!important; color:rgb(185,189,182)!important; background:none!important"> <code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; background:none!important">&nbsp;&nbsp;&nbsp;&nbsp;</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">SvTestObject *testObject4 = [[SvTestObject alloc] init];&nbsp;</code></td> 
  </tr> 
 </tbody> 
</table>

<table style="border-spacing:0px; border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; border-collapse:collapse!important; width:auto!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
 <tbody style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
  <tr style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
   <td style="border-top-width:0px!important; border-right-width:0px!important; border-bottom-width:0px!important; border-left-style:none!important; border-color:initial!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px 0px 0px 0.5em!important; vertical-align:top!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; word-break:break-all!important; color:rgb(185,189,182)!important; background:none!important"> <code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; background:none!important">&nbsp;&nbsp;&nbsp;&nbsp;</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">NSTimer *timer = [[NSTimer alloc] initWithFireDate:[NSDate dateWithTimeIntervalSinceNow:1] interval:1 target:testObject4 selector:@selector(timerAction:) userInfo:nil repeats:NO];&nbsp;</code></td> 
  </tr> 
 </tbody> 
</table>

<table style="border-spacing:0px; border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; border-collapse:collapse!important; width:auto!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
 <tbody style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
  <tr style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
   <td style="border-top-width:0px!important; border-right-width:0px!important; border-bottom-width:0px!important; border-left-style:none!important; border-color:initial!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px 0px 0px 0.5em!important; vertical-align:top!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; word-break:break-all!important; color:rgb(185,189,182)!important; background:none!important"> <code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; background:none!important">&nbsp;&nbsp;&nbsp;&nbsp;</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">[[NSRunLoop currentRunLoop] addTimer:timer forMode:NSDefaultRunLoopMode];&nbsp;</code></td> 
  </tr> 
 </tbody> 
</table>

<table style="border-spacing:0px; border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; border-collapse:collapse!important; width:auto!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
 <tbody style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
  <tr style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
   <td style="border-top-width:0px!important; border-right-width:0px!important; border-bottom-width:0px!important; border-left-style:none!important; border-color:initial!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px 0px 0px 0.5em!important; vertical-align:top!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; word-break:break-all!important; color:rgb(185,189,182)!important; background:none!important"> <code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; background:none!important">&nbsp;&nbsp;&nbsp;&nbsp;</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(255,125,39)!important; background:none!important">// 打开下面一行输出runloop的内容就可以看出，timer却是已经被添加进去&nbsp;</code></td> 
  </tr> 
 </tbody> 
</table>

<table style="border-spacing:0px; border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; border-collapse:collapse!important; width:auto!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
 <tbody style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
  <tr style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
   <td style="border-top-width:0px!important; border-right-width:0px!important; border-bottom-width:0px!important; border-left-style:none!important; border-color:initial!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px 0px 0px 0.5em!important; vertical-align:top!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; word-break:break-all!important; color:rgb(185,189,182)!important; background:none!important"> <code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; background:none!important">&nbsp;&nbsp;&nbsp;&nbsp;</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(255,125,39)!important; background:none!important">//NSLog(@"the thread's runloop: %@", [NSRunLoop currentRunLoop]);&nbsp;</code></td> 
  </tr> 
 </tbody> 
</table>

<table style="border-spacing:0px; border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; border-collapse:collapse!important; width:auto!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
 <tbody style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
  <tr style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
   <td style="border-top-width:0px!important; border-right-width:0px!important; border-bottom-width:0px!important; border-left-style:none!important; border-color:initial!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px 0px 0px 0.5em!important; vertical-align:top!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; word-break:break-all!important; color:rgb(185,189,182)!important; background:none!important"> <code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; background:none!important">&nbsp;&nbsp;&nbsp;&nbsp;</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(255,125,39)!important; background:none!important">// 打开下面一行, 该线程的runloop就会运行起来，timer才会起作用&nbsp;</code></td> 
  </tr> 
 </tbody> 
</table>

<table style="border-spacing:0px; border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; border-collapse:collapse!important; width:auto!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
 <tbody style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
  <tr style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
   <td style="border-top-width:0px!important; border-right-width:0px!important; border-bottom-width:0px!important; border-left-style:none!important; border-color:initial!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px 0px 0px 0.5em!important; vertical-align:top!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; word-break:break-all!important; color:rgb(185,189,182)!important; background:none!important"> <code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; background:none!important">&nbsp;&nbsp;&nbsp;&nbsp;</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(255,125,39)!important; background:none!important">//[[NSRunLoop currentRunLoop] runUntilDate:[NSDate dateWithTimeIntervalSinceNow:3]];&nbsp;</code></td> 
  </tr> 
 </tbody> 
</table>

<table style="border-spacing:0px; border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; border-collapse:collapse!important; width:auto!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
 <tbody style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
  <tr style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
   <td style="border-top-width:0px!important; border-right-width:0px!important; border-bottom-width:0px!important; border-left-style:none!important; border-color:initial!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px 0px 0px 0.5em!important; vertical-align:top!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; word-break:break-all!important; color:rgb(185,189,182)!important; background:none!important"> <code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; background:none!important">&nbsp;&nbsp;&nbsp;&nbsp;</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">[testObject4 release];&nbsp;</code></td> 
  </tr> 
 </tbody> 
</table>

<table style="border-spacing:0px; border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; border-collapse:collapse!important; width:auto!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
 <tbody style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
  <tr style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
   <td style="border-top-width:0px!important; border-right-width:0px!important; border-bottom-width:0px!important; border-left-style:none!important; border-color:initial!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px 0px 0px 0.5em!important; vertical-align:top!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; word-break:break-all!important; color:rgb(185,189,182)!important; background:none!important"> <code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; background:none!important">&nbsp;&nbsp;&nbsp;&nbsp;</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">NSLog(@</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(255,158,123)!important; background:none!important">"invoke release to testObject4"</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">);&nbsp;</code></td> 
  </tr> 
 </tbody> 
</table>

<table style="border-spacing:0px; border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; border-collapse:collapse!important; width:auto!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
 <tbody style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
  <tr style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
   <td style="border-top-width:0px!important; border-right-width:0px!important; border-bottom-width:0px!important; border-left-style:none!important; border-color:initial!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px 0px 0px 0.5em!important; vertical-align:top!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; word-break:break-all!important; color:rgb(185,189,182)!important; background:none!important"> <code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; background:none!important">&nbsp;&nbsp;&nbsp;&nbsp;</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">[pool release];&nbsp;</code></td> 
  </tr> 
 </tbody> 
</table>

<table style="border-spacing:0px; border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; border-collapse:collapse!important; width:auto!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
 <tbody style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
  <tr style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
   <td style="border-top-width:0px!important; border-right-width:0px!important; border-bottom-width:0px!important; border-left-style:none!important; border-color:initial!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px 0px 0px 0.5em!important; vertical-align:top!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; word-break:break-all!important; color:rgb(185,189,182)!important; background:none!important"> <code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">- (</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; font-weight:bold!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(0,255,255)!important; background:none!important">void</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">)applicationWillResignActive:(UIApplication *)application&nbsp;</code></td> 
  </tr> 
 </tbody> 
</table>

<table style="border-spacing:0px; border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; border-collapse:collapse!important; width:auto!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
 <tbody style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
  <tr style="border:0px!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; background:none!important"> 
   <td style="border-top-width:0px!important; border-right-width:0px!important; border-bottom-width:0px!important; border-left-style:none!important; border-color:initial!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px 0px 0px 0.5em!important; vertical-align:top!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; line-height:1.1em!important; min-height:auto!important; word-break:break-all!important; color:rgb(185,189,182)!important; background:none!important"> <code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; background:none!important">&nbsp;&nbsp;&nbsp;&nbsp;</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">NSLog(@</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(255,158,123)!important; background:none!important">"SvTimerSample Will resign Avtive!"</code><code style="border:0px!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; margin:0px!important; outline:0px!important; padding:0px!important; vertical-align:baseline!important; line-height:1.1em!important; float:none!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important; color:rgb(211,211,211)!important; background:none!important">);&nbsp;</code></td> 
  </tr> 
 </tbody> 
</table>

上面的程序中，我们新创建了一个线程，然后创建一个timer，并把它添加当该线程的runloop当中，但是运行结果如下：

[![程序输出结果][20131128012536812-300x52.jpeg]][20131128012536812-300x52.jpeg 1]

程序输出结果

观察运行结果，我们发现这个timer知道执行退出也没有触发我们指定的方法，如果我们把上面测试程序中“//\[\[NSRunLoop currentRunLoop\] runUntilDate:\[NSDate dateWithTimeIntervalSinceNow:3\]\];”这一行的注释去掉，则timer将会正确的掉用我们指定的方法。

2、mode是否正确

我们前面自己动手添加runloop的时候，可以看到有一个参数runloopMode，这个参数是干嘛的呢？

前面提到了要想timer生效，我们就得把它添加到指定runloop的指定mode中去，通常是主线程的defalut mode。但有时我们这样做了，却仍然发现timer还是没有触发事件。这是为什么呢？

这是因为timer添加的时候，我们需要指定一个mode，因为同一线程的runloop在运行的时候，任意时刻只能处于一种mode。所以只能当程序处于这种mode的时候，timer才能得到触发事件的机会。

举个不恰当的例子，我们说兄弟几个分别代表runloop的mode，timer代表他们自己的才水桶，然后一群人去排队打水，只有一个水龙头，那么同一时刻，肯定只能有一个人处于接水的状态。也就是说你虽然给了老二一个桶，但是还没轮到它，那么你就得等，只有轮到他的时候你的水桶才能碰上用场。

综上: 要让timer生效，必须保证该线程的runloop已启动，而且其运行的runloopmode也要匹配。

文章转自http://blog.csdn.net/ioswyl88219

[Link 1]: http://www.tekuba.net/
[NSTimer]: http://www.tekuba.net/program/298/
[UIApplication]: http://www.tekuba.net/program/270/
[NSTimer 1]: http://www.xcoder.cn/wp-content/uploads/2013/11/20131128011608171-300x78.jpeg
[NSTimer_NSTimer 1]: http://www.xcoder.cn/wp-content/uploads/2013/11/20131128011608171.jpeg
[20131128012234578-300x46.jpeg]: http://www.xcoder.cn/wp-content/uploads/2013/11/20131128012234578-300x46.jpeg
[20131128012234578-300x46.jpeg 1]: http://www.xcoder.cn/wp-content/uploads/2013/11/20131128012234578.jpeg
[20131128012536812-300x52.jpeg]: http://www.xcoder.cn/wp-content/uploads/2013/11/20131128012536812-300x52.jpeg
[20131128012536812-300x52.jpeg 1]: http://www.xcoder.cn/wp-content/uploads/2013/11/20131128012536812.jpeg