多年iOS开发经验总结(一)

浅浅的花香味﹌ 2022-06-13 05:10 251阅读 0赞

总结了几个月的东西终于能和大家分享了，不多说，直接看东西！

**1、禁止手机睡眠**

<table> 
 <tbody> 
 <tr> 
 <td> 1 </td> 
 <td> [UIApplication&nbsp;sharedApplication].idleTimerDisabled&nbsp;=&nbsp;YES; </td> 
 </tr> 
 </tbody> 
</table>

**2、隐藏某行cell**

**3、禁用button高亮**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 3 </td> 
 <td> button.adjustsImageWhenHighlighted&nbsp;=&nbsp;NO; 或者在创建的时候 &nbsp;UIButton&nbsp;*button&nbsp;=&nbsp;[UIButton&nbsp;buttonWithType:UIButtonTypeCustom]; </td> 
 </tr> 
 </tbody> 
</table>

**4、tableview遇到这种报错failed to obtain a cell from its dataSource**

是因为你的cell被调用的早了。先循环使用了cell，后又创建cell。顺序错了

可能原因：1、xib的cell没有注册 2、内存中已经有这个cell的缓存了(也就是说通过你的cellId找到的cell并不是你想要的类型)，这时候需要改下cell的标识

**5、cocoa pods报这个错误：unable to access ‘**[**https://github.com/facebook/pop.git/**][https_github.com_facebook_pop.git]**': Operation timed out after 0 milliseconds with 0 out of 0 bytes received**

解决办法：原因可能是网络问题，网络请求超时了，只需要重试就行了

**6、cocoa pods 出现ERROR: While executing gem ... (Errno::EPERM)**

解决办法：

[https://segmentfault.com/q/1010000002926243][https_segmentfault.com_q_1010000002926243]

**7、动画切换window的根控制器**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 3 4 5 6 7 8 </td> 
 <td> //&nbsp;options是动画选项 [UIView&nbsp;transitionWithView:[UIApplication&nbsp;sharedApplication].keyWindow&nbsp;duration:0.5f&nbsp;options:UIViewAnimationOptionTransitionCrossDissolve&nbsp;animations:^{ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;BOOL&nbsp;oldState&nbsp;=&nbsp;[UIView&nbsp;areAnimationsEnabled]; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[UIView&nbsp;setAnimationsEnabled:NO]; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[UIApplication&nbsp;sharedApplication].keyWindow.rootViewController&nbsp;=&nbsp;[RootViewController&nbsp;new]; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[UIView&nbsp;setAnimationsEnabled:oldState]; &nbsp;&nbsp;&nbsp;&nbsp;}&nbsp;completion:^(BOOL&nbsp;finished)&nbsp;{ &nbsp;&nbsp;&nbsp;&nbsp;}]; </td> 
 </tr> 
 </tbody> 
</table>

**8、去除数组中重复的对象**

<table> 
 <tbody> 
 <tr> 
 <td> 1 </td> 
 <td> NSArray&nbsp;*newArr&nbsp;=&nbsp;[oldArr&nbsp;valueForKeyPath:@“@distinctUnionOfObjects.self"]; </td> 
 </tr> 
 </tbody> 
</table>

**9、编译的时候遇到 no such file or directory: ／users／apple／XXX**

是因为编译的时候，在此路径下找不到这个文件，解决这个问题，首先是是要检查缺少的文件是不是在工程中，如果不在工程中，需要从本地拖进去，如果发现已经存在工程中了，或者拖进去还是报错，这时候需要去build phases中搜索这个文件，这时候很可能会搜出现两个相同的文件，这时候，有一个路径是正确的，删除另外一个即可。如果删除了还是不行，需要把两个都删掉，然后重新往工程里拖进这个文件即可

**10、iOS8系统中，tableView最好实现下-tableView: heightForRowAtIndexPath:这个代理方法，要不然在iOS8中可能就会出现显示不全或者无法响应事件的问题**

**11、iOS8中实现侧滑功能的时候这个方法必须实现，要不然在iOS8中无法侧滑**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 3 4 </td> 
 <td> //&nbsp;必须写的方法，和editActionsForRowAtIndexPath配对使用，里面什么不写也行 -&nbsp;(void)tableView:(UITableView&nbsp;*)tableView&nbsp;commitEditingStyle:(UITableViewCellEditingStyle)editingStyle&nbsp;forRowAtIndexPath:(NSIndexPath&nbsp;*)indexPath&nbsp;{ &nbsp; } </td> 
 </tr> 
 </tbody> 
</table>

**12、三个通知**

NSSystemTimeZoneDidChangeNotification监听修改时间界面的两个按钮状态变化

UIApplicationSignificantTimeChangeNotification 监听用户改变时间 （只要点击自动设置按钮就会调用） NSSystemClockDidChangeNotification 监听用户修改时间（时间不同才会调用）

**13、SDWebImage本地缓存有时候会害人。如果之前缓存过一张图片，即使下次服务器换了这张图片，但是图片url没换，用sdwebimage下载下来的还是以前那张,所以遇到这种问题，不要先去怼服务器，清空下缓存再试就好了。**

**14、上线前注意：**

*  1）、删掉代码中所有的测试代码
 *  2）、如果后台有审核模式，提醒后台开启此模式
 *  3）、主流程再跑一跑
 *  4）、全局搜索waring，检查所有标记waring的地方

**15、跳进app权限设置**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 3 4 5 6 </td> 
 <td> //&nbsp;跳进app设置 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(UIApplicationOpenSettingsURLString&nbsp;!=&nbsp;NULL)&nbsp;{ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;NSURL&nbsp;*url&nbsp;=&nbsp;[NSURL&nbsp;URLWithString:UIApplicationOpenSettingsURLString]; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[[UIApplication&nbsp;sharedApplication]&nbsp;openURL:url]; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;} &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;} </td> 
 </tr> 
 </tbody> 
</table>

**16、给一个view截图**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 3 4 </td> 
 <td> UIGraphicsBeginImageContextWithOptions(view.bounds.size,&nbsp;YES,&nbsp;0.0); &nbsp;&nbsp;&nbsp;&nbsp;[view.layer&nbsp;renderInContext:UIGraphicsGetCurrentContext()]; &nbsp;&nbsp;&nbsp;&nbsp;UIImage&nbsp;*img&nbsp;=&nbsp;UIGraphicsGetImageFromCurrentImageContext(); &nbsp;&nbsp;&nbsp;&nbsp;UIGraphicsEndImageContext(); </td> 
 </tr> 
 </tbody> 
</table>

**17、开发中如果要动态修改tableView的tableHeaderView或者tableFooterView的高度，需要给tableView重新设置，而不是直接更改高度。正确的做法是重新设置一下tableView.tableFooterView = 更改过高度的view。为什么？其实在iOS8以上直接改高度是没有问题的，在iOS8中出现了contentSize不准确的问题，这是解决办法。**

**18、注意对象为nil的时候，调用此对象分类的方法不会执行**

**19、collectionView的内容小于其宽高的时候是不能滚动的，设置可以滚动：**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 </td> 
 <td> collectionView.alwaysBounceHorizontal&nbsp;=&nbsp;YES; collectionView.alwaysBounceVertical&nbsp;=&nbsp;YES; </td> 
 </tr> 
 </tbody> 
</table>

**20、设置navigationBar上的title颜色和大小**

<table> 
 <tbody> 
 <tr> 
 <td> 1 </td> 
 <td> &nbsp;&nbsp;&nbsp;&nbsp;[self.navigationController.navigationBar&nbsp;setTitleTextAttributes:@{NSForegroundColorAttributeName&nbsp;:&nbsp;[UIColor&nbsp;youColor],&nbsp;NSFontAttributeName&nbsp;:&nbsp;[UIFont&nbsp;systemFontOfSize:15]}] </td> 
 </tr> 
 </tbody> 
</table>

**21、颜色转图片**

**22、view设置圆角**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 3 4 5 6 </td> 
 <td> #define&nbsp;ViewBorderRadius(View,&nbsp;Radius,&nbsp;Width,&nbsp;Color)\ \ [View.layer&nbsp;setCornerRadius:(Radius)];\ [View.layer&nbsp;setMasksToBounds:YES];\ [View.layer&nbsp;setBorderWidth:(Width)];\ [View.layer&nbsp;setBorderColor:[Color&nbsp;CGColor]]&nbsp;//&nbsp;view圆角 </td> 
 </tr> 
 </tbody> 
</table>

**23、强／弱引用**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 </td> 
 <td> #define&nbsp;WeakSelf(type)&nbsp;&nbsp;__weak&nbsp;typeof(type)&nbsp;weak##type&nbsp;=&nbsp;type;&nbsp;//&nbsp;weak #define&nbsp;StrongSelf(type)&nbsp;&nbsp;__strong&nbsp;typeof(type)&nbsp;type&nbsp;=&nbsp;weak##type;&nbsp;//&nbsp;strong </td> 
 </tr> 
 </tbody> 
</table>

**24、由角度转换弧度**

<table> 
 <tbody> 
 <tr> 
 <td> 1 </td> 
 <td> #define&nbsp;DegreesToRadian(x)&nbsp;(M_PI&nbsp;*&nbsp;(x)&nbsp;/&nbsp;180.0) </td> 
 </tr> 
 </tbody> 
</table>

**25、由弧度转换角度**

<table> 
 <tbody> 
 <tr> 
 <td> 1 </td> 
 <td> #define&nbsp;RadianToDegrees(radian)&nbsp;(radian*180.0)/(M_PI) </td> 
 </tr> 
 </tbody> 
</table>

**26、获取图片资源**

<table> 
 <tbody> 
 <tr> 
 <td> 1 </td> 
 <td> #define&nbsp;GetImage(imageName)&nbsp;[UIImage&nbsp;imageNamed:[NSString&nbsp;stringWithFormat:@"%@",imageName]] </td> 
 </tr> 
 </tbody> 
</table>

**27、获取temp**

<table> 
 <tbody> 
 <tr> 
 <td> 1 </td> 
 <td> #define&nbsp;PathTemp&nbsp;NSTemporaryDirectory() </td> 
 </tr> 
 </tbody> 
</table>

**28、获取沙盒 Document**

<table> 
 <tbody> 
 <tr> 
 <td> 1 </td> 
 <td> #define&nbsp;PathDocument&nbsp;[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,&nbsp;NSUserDomainMask,&nbsp;YES)&nbsp;firstObject] </td> 
 </tr> 
 </tbody> 
</table>

**29、获取沙盒 Cache**

<table> 
 <tbody> 
 <tr> 
 <td> 1 </td> 
 <td> #define&nbsp;PathCache&nbsp;[NSSearchPathForDirectoriesInDomains(NSCachesDirectory,&nbsp;NSUserDomainMask,&nbsp;YES)&nbsp;firstObject] </td> 
 </tr> 
 </tbody> 
</table>

**30、GCD代码只执行一次**

<table> 
 <tbody> 
 <tr> 
 <td> 1 </td> 
 <td> #define&nbsp;kDISPATCH_ONCE_BLOCK(onceBlock)&nbsp;static&nbsp;dispatch_once_t&nbsp;onceToken;&nbsp;dispatch_once(&amp;onceToken,&nbsp;onceBlock); </td> 
 </tr> 
 </tbody> 
</table>

**31、自定义NSLog**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 3 4 5 </td> 
 <td> #ifdef&nbsp;DEBUG #define&nbsp;NSLog(fmt,&nbsp;...)&nbsp;NSLog((@"%s&nbsp;[Line&nbsp;%d]&nbsp;"&nbsp;fmt),&nbsp;__PRETTY_FUNCTION__,&nbsp;__LINE__,&nbsp;##__VA_ARGS__) #else #define&nbsp;NSLog(...) #endif </td> 
 </tr> 
 </tbody> 
</table>

**32、Font**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 3 4 5 </td> 
 <td> #define&nbsp;FontL(s)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[UIFont&nbsp;systemFontOfSize:s&nbsp;weight:UIFontWeightLight] #define&nbsp;FontR(s)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[UIFont&nbsp;systemFontOfSize:s&nbsp;weight:UIFontWeightRegular] #define&nbsp;FontB(s)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[UIFont&nbsp;systemFontOfSize:s&nbsp;weight:UIFontWeightBold] #define&nbsp;FontT(s)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[UIFont&nbsp;systemFontOfSize:s&nbsp;weight:UIFontWeightThin] #define&nbsp;Font(s)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;FontL(s) </td> 
 </tr> 
 </tbody> 
</table>

**33、FORMAT**

<table> 
 <tbody> 
 <tr> 
 <td> 1 </td> 
 <td> #define&nbsp;FORMAT(f,&nbsp;...)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[NSString&nbsp;stringWithFormat:f,&nbsp;##&nbsp;__VA_ARGS__] </td> 
 </tr> 
 </tbody> 
</table>

**34、在主线程上运行**

<table> 
 <tbody> 
 <tr> 
 <td> 1 </td> 
 <td> #define&nbsp;kDISPATCH_MAIN_THREAD(mainQueueBlock)&nbsp;dispatch_async(dispatch_get_main_queue(),&nbsp;mainQueueBlock); </td> 
 </tr> 
 </tbody> 
</table>

**35、开启异步线程**

<table> 
 <tbody> 
 <tr> 
 <td> 1 </td> 
 <td> #define&nbsp;kDISPATCH_GLOBAL_QUEUE_DEFAULT(globalQueueBlock)&nbsp;dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,&nbsp;0),&nbsp;globalQueueBlocl); </td> 
 </tr> 
 </tbody> 
</table>

**36、通知**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 3 </td> 
 <td> #define&nbsp;NOTIF_ADD(n,&nbsp;f)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[[NSNotificationCenter&nbsp;defaultCenter]&nbsp;addObserver:self&nbsp;selector:@selector(f)&nbsp;name:n&nbsp;object:nil] #define&nbsp;NOTIF_POST(n,&nbsp;o)&nbsp;&nbsp;&nbsp;&nbsp;[[NSNotificationCenter&nbsp;defaultCenter]&nbsp;postNotificationName:n&nbsp;object:o] #define&nbsp;NOTIF_REMV()&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[[NSNotificationCenter&nbsp;defaultCenter]&nbsp;removeObserver:self] </td> 
 </tr> 
 </tbody> 
</table>

**37、随机颜色**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 3 4 5 6 7 </td> 
 <td> +&nbsp;(UIColor&nbsp;*)RandomColor&nbsp;{ &nbsp;&nbsp;&nbsp;&nbsp;NSInteger&nbsp;aRedValue&nbsp;=&nbsp;arc4random()&nbsp;%&nbsp;255; &nbsp;&nbsp;&nbsp;&nbsp;NSInteger&nbsp;aGreenValue&nbsp;=&nbsp;arc4random()&nbsp;%&nbsp;255; &nbsp;&nbsp;&nbsp;&nbsp;NSInteger&nbsp;aBlueValue&nbsp;=&nbsp;arc4random()&nbsp;%&nbsp;255; &nbsp;&nbsp;&nbsp;&nbsp;UIColor&nbsp;*randColor&nbsp;=&nbsp;[UIColor&nbsp;colorWithRed:aRedValue&nbsp;/&nbsp;255.0f&nbsp;green:aGreenValue&nbsp;/&nbsp;255.0f&nbsp;blue:aBlueValue&nbsp;/&nbsp;255.0f&nbsp;alpha:1.0f]; &nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;randColor; } </td> 
 </tr> 
 </tbody> 
</table>

**38、获取window**

**39、修改textField的placeholder的字体颜色、大小**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 </td> 
 <td> [textField&nbsp;setValue:[UIColor&nbsp;redColor]&nbsp;forKeyPath:@"_placeholderLabel.textColor"]; [textField&nbsp;setValue:[UIFont&nbsp;boldSystemFontOfSize:16]&nbsp;forKeyPath:@"_placeholderLabel.font"]; </td> 
 </tr> 
 </tbody> 
</table>

**40、统一收起键盘**

<table> 
 <tbody> 
 <tr> 
 <td> 1 </td> 
 <td> [[[UIApplication&nbsp;sharedApplication]&nbsp;keyWindow]&nbsp;endEditing:YES]; </td> 
 </tr> 
 </tbody> 
</table>

**41、控制屏幕旋转，在控制器中写**

**42、获取app缓存大小**

**43、清理app缓存**

**44、模型转字典**

**45、交换两个方法实现**

**46、打印百分号和引号**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 </td> 
 <td> &nbsp;&nbsp;&nbsp;&nbsp;NSLog(@"%%"); &nbsp;&nbsp;&nbsp;&nbsp;NSLog(@"\""); </td> 
 </tr> 
 </tbody> 
</table>

**47、几个常用权限判断**

**48、获取手机型号**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 </td> 
 <td> &nbsp;&nbsp;&nbsp;&nbsp;+&nbsp;(NSString&nbsp;*)getDeviceInfo&nbsp;{ &nbsp;&nbsp;&nbsp;&nbsp;struct&nbsp;utsname&nbsp;systemInfo; &nbsp;&nbsp;&nbsp;&nbsp;uname(&amp;systemInfo); &nbsp;&nbsp;&nbsp;&nbsp;NSString&nbsp;*platform&nbsp;=&nbsp;[NSString&nbsp;stringWithCString:systemInfo.machine&nbsp;encoding:NSASCIIStringEncoding]; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPhone1,1"])&nbsp;return&nbsp;@"iPhone&nbsp;2G"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPhone1,2"])&nbsp;return&nbsp;@"iPhone&nbsp;3G"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPhone2,1"])&nbsp;return&nbsp;@"iPhone&nbsp;3GS"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPhone3,1"])&nbsp;return&nbsp;@"iPhone&nbsp;4"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPhone3,2"])&nbsp;return&nbsp;@"iPhone&nbsp;4"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPhone3,3"])&nbsp;return&nbsp;@"iPhone&nbsp;4"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPhone4,1"])&nbsp;return&nbsp;@"iPhone&nbsp;4S"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPhone5,1"])&nbsp;return&nbsp;@"iPhone&nbsp;5"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPhone5,2"])&nbsp;return&nbsp;@"iPhone&nbsp;5"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPhone5,3"])&nbsp;return&nbsp;@"iPhone&nbsp;5c"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPhone5,4"])&nbsp;return&nbsp;@"iPhone&nbsp;5c"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPhone6,1"])&nbsp;return&nbsp;@"iPhone&nbsp;5s"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPhone6,2"])&nbsp;return&nbsp;@"iPhone&nbsp;5s"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPhone7,1"])&nbsp;return&nbsp;@"iPhone&nbsp;6&nbsp;Plus"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPhone7,2"])&nbsp;return&nbsp;@"iPhone&nbsp;6"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPhone8,1"])&nbsp;return&nbsp;@"iPhone&nbsp;6s"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPhone8,2"])&nbsp;return&nbsp;@"iPhone&nbsp;6s&nbsp;Plus"; &nbsp;&nbsp;&nbsp;&nbsp;//&nbsp;日行两款手机型号均为日本独占，可能使用索尼FeliCa支付方案而不是苹果支付 &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPhone9,1"])&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;@"国行、日版、港行iPhone&nbsp;7"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPhone9,2"])&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;@"港行、国行iPhone&nbsp;7&nbsp;Plus"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPhone9,3"])&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;@"美版、台版iPhone&nbsp;7"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPhone9,4"])&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;@"美版、台版iPhone&nbsp;7&nbsp;Plus"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPhone8,4"])&nbsp;return&nbsp;@"iPhone&nbsp;SE"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPod1,1"])&nbsp;return&nbsp;@"iPod&nbsp;Touch&nbsp;1G"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPod2,1"])&nbsp;return&nbsp;@"iPod&nbsp;Touch&nbsp;2G"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPod3,1"])&nbsp;return&nbsp;@"iPod&nbsp;Touch&nbsp;3G"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPod4,1"])&nbsp;return&nbsp;@"iPod&nbsp;Touch&nbsp;4G"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPod5,1"])&nbsp;return&nbsp;@"iPod&nbsp;Touch&nbsp;5G"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPad1,1"])&nbsp;return&nbsp;@"iPad&nbsp;1G"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPad2,1"])&nbsp;return&nbsp;@"iPad&nbsp;2"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPad2,2"])&nbsp;return&nbsp;@"iPad&nbsp;2"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPad2,3"])&nbsp;return&nbsp;@"iPad&nbsp;2"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPad2,4"])&nbsp;return&nbsp;@"iPad&nbsp;2"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPad2,5"])&nbsp;return&nbsp;@"iPad&nbsp;Mini&nbsp;1G"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPad2,6"])&nbsp;return&nbsp;@"iPad&nbsp;Mini&nbsp;1G"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPad2,7"])&nbsp;return&nbsp;@"iPad&nbsp;Mini&nbsp;1G"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPad3,1"])&nbsp;return&nbsp;@"iPad&nbsp;3"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPad3,2"])&nbsp;return&nbsp;@"iPad&nbsp;3"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPad3,3"])&nbsp;return&nbsp;@"iPad&nbsp;3"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPad3,4"])&nbsp;return&nbsp;@"iPad&nbsp;4"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPad3,5"])&nbsp;return&nbsp;@"iPad&nbsp;4"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPad3,6"])&nbsp;return&nbsp;@"iPad&nbsp;4"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPad4,1"])&nbsp;return&nbsp;@"iPad&nbsp;Air"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPad4,2"])&nbsp;return&nbsp;@"iPad&nbsp;Air"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPad4,3"])&nbsp;return&nbsp;@"iPad&nbsp;Air"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPad4,4"])&nbsp;return&nbsp;@"iPad&nbsp;Mini&nbsp;2G"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPad4,5"])&nbsp;return&nbsp;@"iPad&nbsp;Mini&nbsp;2G"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"iPad4,6"])&nbsp;return&nbsp;@"iPad&nbsp;Mini&nbsp;2G"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"i386"])&nbsp;return&nbsp;@"iPhone&nbsp;Simulator"; &nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;([platform&nbsp;isEqualToString:@"x86_64"])&nbsp;return&nbsp;@"iPhone&nbsp;Simulator"; &nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;platform; } </td> 
 </tr> 
 </tbody> 
</table>

49、长按复制功能

**50、cocoapods升级**

在终端执行 sudo gem install -n / usr / local / bin cocoapods --pre

**51、设置启动页后，依然显示之前的**

删除app，手机重启，重新安装

**52、判断图片类型**

**53、获取手机和app信息**

**54、获取一个类的所有属性**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 3 4 5 6 7 </td> 
 <td> id&nbsp;LenderClass&nbsp;=&nbsp;objc_getClass("Lender"); unsigned&nbsp;int&nbsp;outCount,&nbsp;i; objc_property_t&nbsp;*properties&nbsp;=&nbsp;class_copyPropertyList(LenderClass,&nbsp;&amp;outCount); for&nbsp;(i&nbsp;=&nbsp;0;&nbsp;i&nbsp;&lt;&nbsp;outCount;&nbsp;i++)&nbsp;{ &nbsp;&nbsp;&nbsp;&nbsp;objc_property_t&nbsp;property&nbsp;=&nbsp;properties[i]; &nbsp;&nbsp;&nbsp;&nbsp;fprintf(stdout,&nbsp;"%s&nbsp;%s\n",&nbsp;property_getName(property),&nbsp;property_getAttributes(property)); } </td> 
 </tr> 
 </tbody> 
</table>

**55、image圆角**

**56、image拉伸**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 3 4 5 6 7 </td> 
 <td> +&nbsp;(UIImage&nbsp;*)resizableImage:(NSString&nbsp;*)imageName { &nbsp;&nbsp;&nbsp;&nbsp;UIImage&nbsp;*image&nbsp;=&nbsp;[UIImage&nbsp;imageNamed:imageName]; &nbsp;&nbsp;&nbsp;&nbsp;CGFloat&nbsp;imageW&nbsp;=&nbsp;image.size.width; &nbsp;&nbsp;&nbsp;&nbsp;CGFloat&nbsp;imageH&nbsp;=&nbsp;image.size.height; &nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;[image&nbsp;resizableImageWithCapInsets:UIEdgeInsetsMake(imageH&nbsp;*&nbsp;0.5,&nbsp;imageW&nbsp;*&nbsp;0.5,&nbsp;imageH&nbsp;*&nbsp;0.5,&nbsp;imageW&nbsp;*&nbsp;0.5)&nbsp;resizingMode:UIImageResizingModeStretch]; } </td> 
 </tr> 
 </tbody> 
</table>

**57、JSON字符串转字典**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 3 4 5 </td> 
 <td> +&nbsp;(NSDictionary&nbsp;*)parseJSONStringToNSDictionary:(NSString&nbsp;*)JSONString&nbsp;{ &nbsp;&nbsp;&nbsp;&nbsp;NSData&nbsp;*JSONData&nbsp;=&nbsp;[JSONString&nbsp;dataUsingEncoding:NSUTF8StringEncoding]; &nbsp;&nbsp;&nbsp;&nbsp;NSDictionary&nbsp;*responseJSON&nbsp;=&nbsp;[NSJSONSerialization&nbsp;JSONObjectWithData:JSONData&nbsp;options:NSJSONReadingMutableLeaves&nbsp;error:nil]; &nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;responseJSON; } </td> 
 </tr> 
 </tbody> 
</table>

**58、身份证号验证**

**59、获取设备mac地址**

**60、导入自定义字体库**

*  1、找到你想用的字体的 ttf 格式，拖入工程
 *  2、在工程的plist中增加一行数组，“Fonts provided by application”
 *  3、为这个key添加一个item，value为你刚才导入的ttf文件名
 *  4、直接使用即可：label.font = \[UIFont fontWithName:@"你刚才导入的ttf文件名" size:20.0\]；

**61、拿到当前正在显示的控制器，不管是push进去的，还是present进去的都能拿到**

**62、runtime为一个类动态添加属性**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 </td> 
 <td> //&nbsp;动态添加属性的本质是:&nbsp;让对象的某个属性与值产生关联 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;objc_setAssociatedObject(self,&nbsp;WZBPlaceholderViewKey,&nbsp;placeholderView,&nbsp;OBJC_ASSOCIATION_RETAIN_NONATOMIC); </td> 
 </tr> 
 </tbody> 
</table>

**63、获取runtime为一个类动态添加的属性**

<table> 
 <tbody> 
 <tr> 
 <td> 1 </td> 
 <td> objc_getAssociatedObject(self,&nbsp;WZBPlaceholderViewKey); </td> 
 </tr> 
 </tbody> 
</table>

**64、KVO监听某个对象的属性**

**65、Reachability判断网络状态**

**66、AFNetworking监听网络状态**

**67、透明颜色不影响子视图透明度**

<table> 
 <tbody> 
 <tr> 
 <td> 1 </td> 
 <td> &nbsp;&nbsp;&nbsp;&nbsp;[UIColor&nbsp;colorWithRed:&nbsp;green:&nbsp;blue:&nbsp;alpha:]; </td> 
 </tr> 
 </tbody> 
</table>

**68、取图片某一点的颜色**

**69、判断该图片是否有透明度通道**

**70、获得灰度图**

**71、根据bundle中的文件名读取图片**

**72、合并两个图片**

**73、根据bundle中的图片名创建imageview**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 3 4 </td> 
 <td> +&nbsp;(id)imageViewWithImageNamed:(NSString*)imageName { &nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;[[UIImageView&nbsp;alloc]&nbsp;initWithImage:[UIImage&nbsp;imageNamed:imageName]]; } </td> 
 </tr> 
 </tbody> 
</table>

**74、为imageView添加倒影**

**75、画水印**

**76、让label的文字内容显示在左上／右上／左下／右下／中心顶／中心底部**

**77、scrollView上的输入框，键盘挡住的问题**

**78、frame布局的cell动态高度**

这种通常在你的模型中添加一个辅助属性cellHeight，在模型中重写这个属性的get方法，根据你的布局和模型中的其他属性值计算出总高度。最后在tableView：heightForRow方法中，根据indexPath找出对应的模型，返回这个高度即可。

**79、AutoLayout布局的cell动态高度**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 3 4 </td> 
 <td> //&nbsp;1、设置tableView的属性 self.tableView.rowHeight&nbsp;=&nbsp;UITableViewAutomaticDimension; self.tableView.estimatedRowHeight&nbsp;=&nbsp;44.0;&nbsp;//&nbsp;这个属性非0，估计cell高度 //&nbsp;2、至上而下设置cell的约束，注意，上下左右最好都要顶到cell的四周 </td> 
 </tr> 
 </tbody> 
</table>

cell

**80、使用performSelector:调用函数，内存泄漏问题**

当我们在开发中使用\[obj performSelector:NSSelectorFromString(@"aMethod")\];这类方法时可能会收到一个警告"performSelector may cause a leak because its selector is unknown".

是因为编译器不清楚这个对象能不能相应这个方法，如果不能，则是不安全的，而且编译器也不清楚该怎么处理这个方法的返回值！

**81、一个字符串是否包含另一个字符串**

**82、cell去除选中效果**

<table> 
 <tbody> 
 <tr> 
 <td> 1 </td> 
 <td> cell.selectionStyle&nbsp;=&nbsp;UITableViewCellSelectionStyleNone; </td> 
 </tr> 
 </tbody> 
</table>

**83、cell点按效果**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 3 </td> 
 <td> -&nbsp;(void)tableView:(UITableView&nbsp;*)tableView&nbsp;didSelectRowAtIndexPath:(NSIndexPath&nbsp;*)indexPath&nbsp;{ &nbsp;&nbsp;&nbsp;&nbsp;[tableView&nbsp;deselectRowAtIndexPath:indexPath&nbsp;animated:YES]; } </td> 
 </tr> 
 </tbody> 
</table>

84、当删除一个从xib拖出来的属性时，一定记得把xib中对应的线也删掉，不然会报类似\[setValue:forUndefinedKey:\]: this class is not key value coding-compliant for the key的crash

点击这个叉号删除

**85、真机测试的时候报错：Could not launch "你的 App"，process launch failed: Security**

因为你的app没有上线，iOS9开始，需要手动信任Xcode生成的描述文件，打开手机设置->通用->描述文件->点击你的app的描述文件->点击信任

**86、真机测试的时候报错：Could not find Developer Disk Image**

这是因为你的设备系统版本大于Xcode能兼容的系统版本，比如你的设备是iOS10.3，而Xcode版本是8.2（Xcode8.2最大兼容iOS10.2），就会报这个错误。解决办法就是升级Xcode！

**87、UITextView没有placeholder的问题？**

网上有很多此类自定义控件，也可以参考下我写的一个UITextView分类 UITextView-WZB

**88、移除字符串中的空格和换行**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 3 4 5 6 </td> 
 <td> +&nbsp;(NSString&nbsp;*)removeSpaceAndNewline:(NSString&nbsp;*)str&nbsp;{ &nbsp;&nbsp;&nbsp;&nbsp;NSString&nbsp;*temp&nbsp;=&nbsp;[str&nbsp;stringByReplacingOccurrencesOfString:@"&nbsp;"&nbsp;withString:@""]; &nbsp;&nbsp;&nbsp;&nbsp;temp&nbsp;=&nbsp;[temp&nbsp;stringByReplacingOccurrencesOfString:@"\r"&nbsp;withString:@""]; &nbsp;&nbsp;&nbsp;&nbsp;temp&nbsp;=&nbsp;[temp&nbsp;stringByReplacingOccurrencesOfString:@"\n"&nbsp;withString:@""]; &nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;temp; } </td> 
 </tr> 
 </tbody> 
</table>

**89、判断字符串中是否有空格**

**90、获取一个视频的第一帧图片**

**91、获取视频的时长**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 3 4 5 6 7 </td> 
 <td> +&nbsp;(NSInteger)getVideoTimeByUrlString:(NSString&nbsp;*)urlString&nbsp;{ &nbsp;&nbsp;&nbsp;&nbsp;NSURL&nbsp;*videoUrl&nbsp;=&nbsp;[NSURL&nbsp;URLWithString:urlString]; &nbsp;&nbsp;&nbsp;&nbsp;AVURLAsset&nbsp;*avUrl&nbsp;=&nbsp;[AVURLAsset&nbsp;assetWithURL:videoUrl]; &nbsp;&nbsp;&nbsp;&nbsp;CMTime&nbsp;time&nbsp;=&nbsp;[avUrl&nbsp;duration]; &nbsp;&nbsp;&nbsp;&nbsp;int&nbsp;seconds&nbsp;=&nbsp;ceil(time.value/time.timescale); &nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;seconds; } </td> 
 </tr> 
 </tbody> 
</table>

**92、字符串是否为空**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 3 </td> 
 <td> +&nbsp;(BOOL)isEqualToNil:(NSString&nbsp;*)str&nbsp;{ &nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;str.length&nbsp;&lt;=&nbsp;0&nbsp;||&nbsp;[str&nbsp;isEqualToString:@""]&nbsp;||&nbsp;!str; } </td> 
 </tr> 
 </tbody> 
</table>

**93、将app上传到App Store的时候通常会遇到这个问题**

try again

很多人说这事苹果爸爸服务器问题，重复尝试几次，总会成功的！

但是经过尝试发现如果使用Application Loader上传成功率就非常高，所以还是推荐把ipa文件导出直接用Application Loader上传。

如果Application Loader也不行，需要检查下自己的网络，有时候vpn也会提高速度。

94、当tableView占不满一屏时，去除下边多余的单元格

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 </td> 
 <td> self.tableView.tableHeaderView&nbsp;=&nbsp;[UIView&nbsp;new]; self.tableView.tableFooterView&nbsp;=&nbsp;[UIView&nbsp;new]; </td> 
 </tr> 
 </tbody> 
</table>

95、isKindOfClass和isMemberOfClass的区别

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 </td> 
 <td> isKindOfClass可以判断某个对象是否属于某个类，或者这个类的子类。 isMemberOfClass更加精准，它只能判断这个对象类型是否为这个类(不能判断子类) </td> 
 </tr> 
 </tbody> 
</table>

**96、\_\_block**

当一个局部变量需要在block里改变时，需要在定义时加上\_\_block修饰，具体请看官方文档 [ http://developer.apple.com/library/ios/documentation/cocoa/Conceptual/Blocks/Articles/bxVariables.html\#//apple\_ref/doc/uid/TP40007502-CH6-SW6][http_developer.apple.com_library_ios_documentation_cocoa_Conceptual_Blocks_Articles_bxVariables.html_apple_ref_doc_uid_TP40007502-CH6-SW6]

**97、-\[ViewController aMethod:\]: unrecognized selector sent to instance 0x7fe91e607fb0**

这是一个经典错误，ViewController不能响应aMethod这个方法，错误原因可能viewController文件中没有实现aMethod这个方法

**98、UITableView () failed to obtain a cell from its dataSource ()**

这个错误原因是tableView的代理方法-tableView:cellForRowAtIndexPath:需要返回一个UITableViewCell,而你返回了一个nil。另外这个地方返回值不是UITableViewCell类型也会导致崩溃

**99、约束如何做UIView动画？**

*  1、把需要改的约束Constraint拖条线出来，成为属性
 *  2、在需要动画的地方加入代码，改变此属性的constant属性
 *  3、开始做UIView动画，动画里边调用layoutIfNeeded方法

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 3 4 5 </td> 
 <td> @property&nbsp;(weak,&nbsp;nonatomic)&nbsp;IBOutlet&nbsp;NSLayoutConstraint&nbsp;*buttonTopConstraint; self.buttonTopConstraint.constant&nbsp;=&nbsp;100; &nbsp;&nbsp;&nbsp;&nbsp;[UIView&nbsp;animateWithDuration:.5&nbsp;animations:^{ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[self.view&nbsp;layoutIfNeeded]; &nbsp;&nbsp;&nbsp;&nbsp;}]; </td> 
 </tr> 
 </tbody> 
</table>

**100、从NSURL中拿到链接字符串**

<table> 
 <tbody> 
 <tr> 
 <td> 1 </td> 
 <td> NSString&nbsp;*urlString&nbsp;=&nbsp;myURL.absoluteString; </td> 
 </tr> 
 </tbody> 
</table>

**101、将tableView滚动到顶部**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 3 </td> 
 <td> [tableView&nbsp;setContentOffset:CGPointZero&nbsp;animated:YES]; 或者 [tableView&nbsp;scrollRectToVisible:CGRectMake(0,&nbsp;0,&nbsp;1,&nbsp;1)&nbsp;animated:YES]; </td> 
 </tr> 
 </tbody> 
</table>

**102、如果用addTarget:action:forControlEvents:方法为一个button添加了很多点击事件，在某个时刻想一次删除怎么办？只需要调用下边这句代码**

<table> 
 <tbody> 
 <tr> 
 <td> 1 </td> 
 <td> [youButton&nbsp;removeTarget:nil&nbsp;action:nil&nbsp;forControlEvents:UIControlEventAllEvents]; </td> 
 </tr> 
 </tbody> 
</table>

**103、某个字体的高度**

<table> 
 <tbody> 
 <tr> 
 <td> 1 </td> 
 <td> font.lineHeight; </td> 
 </tr> 
 </tbody> 
</table>

**104、删除某个view所有的子视图**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 </td> 
 <td> [[someView&nbsp;subviews] &nbsp;makeObjectsPerformSelector:@selector(removeFromSuperview)]; </td> 
 </tr> 
 </tbody> 
</table>

**105、删除NSUserDefaults所有记录**

**106、禁用系统滑动返回功能**

107、模拟器报错

模拟器报错

解决办法：

打开模拟器->Simulator->Reset Content and Settings...

如果不行，就重启试试！

**108、自定义cell选中背景颜色**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 3 </td> 
 <td> UIView&nbsp;*bgColorView&nbsp;=&nbsp;[[UIView&nbsp;alloc]&nbsp;init]; bgColorView.backgroundColor&nbsp;=&nbsp;[UIColor&nbsp;redColor]; [cell&nbsp;setSelectedBackgroundView:bgColorView]; </td> 
 </tr> 
 </tbody> 
</table>

**109、UILabel设置内边距**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 3 4 5 6 </td> 
 <td> 子类化UILabel，重写drawTextInRect方法 -&nbsp;(void)drawTextInRect:(CGRect)rect&nbsp;{ &nbsp;&nbsp;&nbsp;&nbsp;//&nbsp;边距，上左下右 &nbsp;&nbsp;&nbsp;&nbsp;UIEdgeInsets&nbsp;insets&nbsp;=&nbsp;{0,&nbsp;5,&nbsp;0,&nbsp;5}; &nbsp;&nbsp;&nbsp;&nbsp;[super&nbsp;drawTextInRect:UIEdgeInsetsInsetRect(rect,&nbsp;insets)]; } </td> 
 </tr> 
 </tbody> 
</table>

**110、UILabel设置文字描边**

**111、使用模拟器截图**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 </td> 
 <td> 快捷键command&nbsp;+&nbsp;s 或者File-&gt;Save&nbsp;Screen&nbsp;Shot </td> 
 </tr> 
 </tbody> 
</table>

**112、scrollView滚动到最下边**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 </td> 
 <td> CGPoint&nbsp;bottomOffset&nbsp;=&nbsp;CGPointMake(0,&nbsp;scrollView.contentSize.height&nbsp;-&nbsp;scrollView.bounds.size.height); [scrollView&nbsp;setContentOffset:bottomOffset&nbsp;animated:YES]; </td> 
 </tr> 
 </tbody> 
</table>

**113、UIView背景颜色渐变**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 3 4 5 6 </td> 
 <td> &nbsp;&nbsp;&nbsp;&nbsp;UIView&nbsp;*view&nbsp;=&nbsp;[[UIView&nbsp;alloc]&nbsp;initWithFrame:CGRectMake(0,&nbsp;0,&nbsp;320,&nbsp;100)]; &nbsp;&nbsp;&nbsp;&nbsp;[self.view&nbsp;addSubview:view]; &nbsp;&nbsp;&nbsp;&nbsp;CAGradientLayer&nbsp;*gradient&nbsp;=&nbsp;[CAGradientLayer&nbsp;layer]; &nbsp;&nbsp;&nbsp;&nbsp;gradient.frame&nbsp;=&nbsp;view.bounds; &nbsp;&nbsp;&nbsp;&nbsp;gradient.colors&nbsp;=&nbsp;[NSArray&nbsp;arrayWithObjects:(id)[[UIColor&nbsp;blackColor]&nbsp;CGColor],&nbsp;(id)[[UIColor&nbsp;whiteColor]&nbsp;CGColor],&nbsp;nil]; &nbsp;&nbsp;&nbsp;&nbsp;[view.layer&nbsp;insertSublayer:gradient&nbsp;atIndex:0]; </td> 
 </tr> 
 </tbody> 
</table>

**114、停止UIView动画**

<table> 
 <tbody> 
 <tr> 
 <td> 1 </td> 
 <td> [yourView.layer&nbsp;removeAllAnimations] </td> 
 </tr> 
 </tbody> 
</table>

**115、为UIView某个角添加圆角**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 3 4 5 6 </td> 
 <td> //&nbsp;左上角和右下角添加圆角 UIBezierPath&nbsp;*maskPath&nbsp;=&nbsp;[UIBezierPath&nbsp;bezierPathWithRoundedRect:view.bounds&nbsp;byRoundingCorners:(UIRectCornerTopLeft&nbsp;|&nbsp;UIRectCornerBottomRight)&nbsp;cornerRadii:CGSizeMake(20,&nbsp;20)]; &nbsp;&nbsp;&nbsp;&nbsp;CAShapeLayer&nbsp;*maskLayer&nbsp;=&nbsp;[CAShapeLayer&nbsp;layer]; &nbsp;&nbsp;&nbsp;&nbsp;maskLayer.frame&nbsp;=&nbsp;view.bounds; &nbsp;&nbsp;&nbsp;&nbsp;maskLayer.path&nbsp;=&nbsp;maskPath.CGPath; &nbsp;&nbsp;&nbsp;&nbsp;view.layer.mask&nbsp;=&nbsp;maskLayer; </td> 
 </tr> 
 </tbody> 
</table>

**116、删除Xcode Derived data缓存数据**

依次点击Xcode -> Preferences -> location，然后点击 Derived data路径后到小箭头，删除这个文件夹下的数据就可以了，如图

Xcode Derived data

**117、将一个view放置在其兄弟视图的最上面**

<table> 
 <tbody> 
 <tr> 
 <td> 1 </td> 
 <td> [parentView&nbsp;bringSubviewToFront:yourView] </td> 
 </tr> 
 </tbody> 
</table>

**118、将一个view放置在其兄弟视图的最下面**

<table> 
 <tbody> 
 <tr> 
 <td> 1 </td> 
 <td> [parentView&nbsp;sendSubviewToBack:yourView] </td> 
 </tr> 
 </tbody> 
</table>

**119、让手机震动一下**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 3 4 5 </td> 
 <td> 倒入框架 #import AudioServicesPlayAlertSound(kSystemSoundID_Vibrate); 或者 AudioServicesPlaySystemSound(kSystemSoundID_Vibrate); </td> 
 </tr> 
 </tbody> 
</table>

**120、layoutSubviews方法什么时候调用？**

*  1、init方法不会调用
 *  2、addSubview方法等时候会调用
 *  3、bounds改变的时候调用
 *  4、scrollView滚动的时候会调用scrollView的layoutSubviews方法(所以不建议在scrollView的layoutSubviews方法中做复杂逻辑)
 *  5、旋转设备的时候调用
 *  6、子视图被移除的时候调用

参考请看：[http://blog.logichigh.com/2011/03/16/when-does-layoutsubviews-get-called/][http_blog.logichigh.com_2011_03_16_when-does-layoutsubviews-get-called]

**121、让UILabel在指定的地方换行**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 3 </td> 
 <td> //&nbsp;换行符为\n,在需要换行的地方加上这个符号即可，如&nbsp; label.numberOfLines&nbsp;=&nbsp;0; label.text&nbsp;=&nbsp;@"此处\n换行"; </td> 
 </tr> 
 </tbody> 
</table>

**122、摇一摇功能**

**123、获取图片大小**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 </td> 
 <td> CGFloat&nbsp;imageWidth&nbsp;=&nbsp;image.size.width; &nbsp;&nbsp;&nbsp;&nbsp;CGFloat&nbsp;imageHeight&nbsp;=&nbsp;imageWidth&nbsp;*&nbsp;image.scale; </td> 
 </tr> 
 </tbody> 
</table>

**124、获取view的坐标在整个window上的位置**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 3 4 </td> 
 <td> //&nbsp;v上的(0,&nbsp;0)点在toView上的位置 CGPoint&nbsp;point&nbsp;=&nbsp;[v&nbsp;convertPoint:CGPointMake(0,&nbsp;0)&nbsp;toView:[UIApplication&nbsp;sharedApplication].windows.lastObject]; 或者 CGPoint&nbsp;point&nbsp;=&nbsp;[v.superview&nbsp;convertPoint:v.frame.origin&nbsp;toView:[UIApplication&nbsp;sharedApplication].windows.lastObject]; </td> 
 </tr> 
 </tbody> 
</table>

**125、提交App Store审核程序限制**

您的应用程序的未压缩大小必须小于4GB。每个Mach-O可执行文件（例如app\_name.app/app\_name）不能超过这些限制：

对于MinimumOSVersion小于7.0的应用程序：TEXT二进制文件中所有部分的总数最多为80 MB 。

对于MinimumOSVersion7.x到8.x的应用程序：TEXT对于二进制文件中每个体系结构片段的每个片段，最大为60 MB 。

对于MinimumOSVersion9.0或更高版本的应用程序：\_\_TEXT二进制文件中所有部分的总数最多为500 MB 。参阅：[iTunes Connect开发者指南][iTunes_Connect]

**126、修改UISegmentedControl的字体大小**

<table> 
 <tbody> 
 <tr> 
 <td> 1 </td> 
 <td> [segment&nbsp;setTitleTextAttributes:@{NSFontAttributeName&nbsp;:&nbsp;[UIFont&nbsp;systemFontOfSize:15.0f]}&nbsp;forState:UIControlStateNormal]; </td> 
 </tr> 
 </tbody> 
</table>

**127、在非ViewController的地方弹出UIAlertController对话框**

**128、获取一个view所属的控制器**

**129、UIImage和base64互转**

**130、UIWebView设置背景透明**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 </td> 
 <td> [webView&nbsp;setBackgroundColor:[UIColor&nbsp;clearColor]]; [webView&nbsp;setOpaque:NO]; </td> 
 </tr> 
 </tbody> 
</table>

**131、判断NSDate是不是今天**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 3 4 5 6 7 8 </td> 
 <td> NSDateComponents&nbsp;*otherDay&nbsp;=&nbsp;[[NSCalendar&nbsp;currentCalendar]&nbsp;components:NSCalendarUnitEra&nbsp;|&nbsp;NSCalendarUnitYear&nbsp;|&nbsp;NSCalendarUnitMonth&nbsp;|&nbsp;NSCalendarUnitDay&nbsp;fromDate:aDate]; NSDateComponents&nbsp;*today&nbsp;=&nbsp;[[NSCalendar&nbsp;currentCalendar]&nbsp;components:NSCalendarUnitEra&nbsp;|&nbsp;NSCalendarUnitYear&nbsp;|&nbsp;NSCalendarUnitMonth&nbsp;|&nbsp;NSCalendarUnitDay&nbsp;fromDate:[NSDate&nbsp;date]]; if([today&nbsp;day]&nbsp;==&nbsp;[otherDay&nbsp;day]&nbsp;&amp;&amp; &nbsp;&nbsp;&nbsp;[today&nbsp;month]&nbsp;==&nbsp;[otherDay&nbsp;month]&nbsp;&amp;&amp; &nbsp;&nbsp;&nbsp;[today&nbsp;year]&nbsp;==&nbsp;[otherDay&nbsp;year]&nbsp;&amp;&amp; &nbsp;&nbsp;&nbsp;[today&nbsp;era]&nbsp;==&nbsp;[otherDay&nbsp;era])&nbsp;{ &nbsp;&nbsp;&nbsp;&nbsp;//&nbsp;是今天 } </td> 
 </tr> 
 </tbody> 
</table>

**132、设置tableView分割线颜色**

<table> 
 <tbody> 
 <tr> 
 <td> 1 </td> 
 <td> [self.tableView&nbsp;setSeparatorColor:[UIColor&nbsp;myColor]]; </td> 
 </tr> 
 </tbody> 
</table>

**133、设置屏幕方向**

<table> 
 <tbody> 
 <tr> 
 <td> 1 </td> 
 <td> [[UIDevice&nbsp;currentDevice]&nbsp;setValue:@(UIInterfaceOrientationLandscapeLeft)&nbsp;forKey:@"orientation"]; </td> 
 </tr> 
 </tbody> 
</table>

**134、比较两个颜色是否相等**

135、tableViewCell分割线顶到头

**136、不让控制器的view随着控制器的xib拉伸或压缩**

<table> 
 <tbody> 
 <tr> 
 <td> 1 </td> 
 <td> self.view.autoresizingMask&nbsp;=&nbsp;UIViewAutoresizingFlexibleWidth&nbsp;|&nbsp;UIViewAutoresizingFlexibleHeight; </td> 
 </tr> 
 </tbody> 
</table>

**137、cocoaPods报错 : \[!\] Unable to add a source with url https://github.com/CocoaPods/Specs.git named master-1.**

You can try adding it manually in ~/.cocoapods/repos or via pod repo add.

解决方法：这是因为电脑里安装了另外一个Xcode导致cocoapods找不到路径了

在终端执行 sudo xcode-select -switch /Applications/Xcode.app 即可

**138、安装cocoapods的时候出现 ERROR: While executing gem ... (Errno::EPERM)**

<table> 
 <tbody> 
 <tr> 
 <td> 1 </td> 
 <td> Operation&nbsp;not&nbsp;permitted&nbsp;-&nbsp;/usr/bin/pod </td> 
 </tr> 
 </tbody> 
</table>

解决办法：直接在终端执行 sudo gem install -n /usr/local/bin cocoapods

**139、在状态栏增加网络请求的菊花，类似safari加载网页的时候状态栏菊花**

<table> 
 <tbody> 
 <tr> 
 <td> 1 </td> 
 <td> [UIApplication&nbsp;sharedApplication].networkActivityIndicatorVisible&nbsp;=&nbsp;YES; </td> 
 </tr> 
 </tbody> 
</table>

**140、检查一个rect是否包含一个point**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 </td> 
 <td> //&nbsp;point是否在rect内 BOOL&nbsp;isContains&nbsp;=&nbsp;CGRectContainsPoint(rect,&nbsp;point); </td> 
 </tr> 
 </tbody> 
</table>

**141、在指定的宽度下，让UILabel自动设置最佳font**

<table> 
 <tbody> 
 <tr> 
 <td> 1 </td> 
 <td> label.adjustsFontSizeToFitWidth&nbsp;=&nbsp;YES; </td> 
 </tr> 
 </tbody> 
</table>

**142、将一个image保存在相册中**

**143、修改cell.imageView的大小**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 3 4 5 6 7 </td> 
 <td> UIImage&nbsp;*icon&nbsp;=&nbsp;[UIImage&nbsp;imageNamed:@""]; CGSize&nbsp;itemSize&nbsp;=&nbsp;CGSizeMake(30,&nbsp;30); UIGraphicsBeginImageContextWithOptions(itemSize,&nbsp;NO&nbsp;,0.0); CGRect&nbsp;imageRect&nbsp;=&nbsp;CGRectMake(0.0,&nbsp;0.0,&nbsp;itemSize.width,&nbsp;itemSize.height); [icon&nbsp;drawInRect:imageRect]; cell.imageView.image&nbsp;=&nbsp;UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); </td> 
 </tr> 
 </tbody> 
</table>

**144、为一个view添加虚线边框**

<table> 
 <tbody> 
 <tr> 
 <td> 1 2 3 4 5 6 7 </td> 
 <td> &nbsp;CAShapeLayer&nbsp;*border&nbsp;=&nbsp;[CAShapeLayer&nbsp;layer]; &nbsp;&nbsp;&nbsp;&nbsp;border.strokeColor&nbsp;=&nbsp;[UIColor&nbsp;colorWithRed:67/255.0f&nbsp;green:37/255.0f&nbsp;blue:83/255.0f&nbsp;alpha:1].CGColor; &nbsp;&nbsp;&nbsp;&nbsp;border.fillColor&nbsp;=&nbsp;nil; &nbsp;&nbsp;&nbsp;&nbsp;border.lineDashPattern&nbsp;=&nbsp;@[@4,&nbsp;@2]; &nbsp;&nbsp;&nbsp;&nbsp;border.path&nbsp;=&nbsp;[UIBezierPath&nbsp;bezierPathWithRect:view.bounds].CGPath; &nbsp;&nbsp;&nbsp;&nbsp;border.frame&nbsp;=&nbsp;view.bounds; &nbsp;&nbsp;&nbsp;&nbsp;[view.layer&nbsp;addSublayer:border]; </td> 
 </tr> 
 </tbody> 
</table>

145、UITextView中打开或禁用复制，剪切，选择，全选等功能

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[https_github.com_facebook_pop.git]: https://github.com/facebook/pop.git/
[https_segmentfault.com_q_1010000002926243]: https://segmentfault.com/q/1010000002926243
[http_developer.apple.com_library_ios_documentation_cocoa_Conceptual_Blocks_Articles_bxVariables.html_apple_ref_doc_uid_TP40007502-CH6-SW6]: http://developer.apple.com/library/ios/documentation/cocoa/Conceptual/Blocks/Articles/bxVariables.html#//apple_ref/doc/uid/TP40007502-CH6-SW6
[http_blog.logichigh.com_2011_03_16_when-does-layoutsubviews-get-called]: http://blog.logichigh.com/2011/03/16/when-does-layoutsubviews-get-called/
[iTunes_Connect]: https://developer.apple.com/library/content/documentation/LanguagesUtilities/Conceptual/iTunesConnect_Guide/Chapters/SubmittingTheApp.html
[Link 1]: http://www.jianshu.com/users/6d5126f52682/latest_articles