IOS 自定义软键盘功能，修改换行键为发送键

约定不等于承诺〃 2022-04-06 07:14 1482阅读 0赞

IOS项目是使用混合模式开发，在开发聊天功能时；发现软键盘不能像QQ、微信那样，换行键不能变为发送；网上说是因为输入框类别导致；尝试过以后，还是不行；然后想到用IOS native解决；

先说一下，原生APP 设置软键盘换行键为发送键：

textField.returnKeyType = UIReturnKeySend;//变为发送按钮

这里说一下流程，代码最后贴；

1.注册监听软键盘弹起事件

a).获取软键盘视图

b).获取换行键视图，IOS中换行键叫做Return-Key

c).创建UiButton，将button添加到换行键视图中，创建button时 frame设定位 x=0,y=0,width=换行键width,height=换行键height

d).允许换行键与用户交互：setUserInteractionEnabled: YES

e).注册button TouchDown和TouchUpInside事件

f).添加button事件响应函数

g).添加软键盘tap事件代理

2.注册监听软键盘输入法切换事件

a).创建Timer定时器，不用循环；创建前先判断一下定时器是否活动，如果处于活动中，先销毁再创建，延时在100ms

b).重复1中的步骤

c).销毁定时器并置为nil

3.软键盘tap代理：

\- (BOOL)gestureRecognizer:(UIGestureRecognizer \*)gestureRecognizer shouldReceiveTouch:(UITouch \*)touch

这里说一下为什么要做软键盘tap代理，因为软键盘当中很多功能键都会切换整个键盘视图，所以要重新添加；而且不能直接给这些功能键不能直接设置tap事件，因为这些按键视图本身是不允许与用户交互的；如果你设置了，则按键不能正常输入

a).获取软键盘视图

b).判断tap的touch的点是否在软键盘的功能键当中

c).如果是，则重复2当中步骤

最后，将第一部分代码抽离出来成为一个函数，2、3中直接调用即可。

代码部分：

1.在viewDidLoad中注册通知：

// 键盘出现的通知
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWasShown:) name:UIKeyboardDidShowNotification object:nil];
        // 键盘消失的通知
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillBeHiden:) name:UIKeyboardWillHideNotification object:nil];
        //输入法切换
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(inputModeDidChange:) name:UITextInputCurrentInputModeDidChangeNotification object:nil];

2.注册通知的响应函数：

- (void)keyboardWasShown:(NSNotification *)notification
    {
        NSLog(@"弹起");
        [self createSendBtnInKeyBoardTimer:timer];
    }
    - (void)keyboardWillBeHiden:(NSNotification *)notification
    {
         NSLog(@"收起");
    //    self.textFiledScrollView.frame = CGRectMake(0, 64, kViewWidth, 455.5);
    }
    
    - (void) inputModeDidChange:(NSNotification*) notification {
        NSLog(@"inputModeDidChange");
        timer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(createSendBtnInKeyBoardTimer:) userInfo:nil repeats:NO];
    }

3.添加发送按钮到换行键视图中实现：

- (void)createSendBtnInKeyBoardTimer:(NSTimer*)timer {
        NSLog(@"create sendBtn");
        if(nil != button){
            [button removeFromSuperview];
            button = nil;
        }
        //判断当前页面是否为聊天界面
        UIWebView *webview = (UIWebView *)self.webView;
        NSString *hidden = [webview stringByEvaluatingJavaScriptFromString:@"document.getElementById('communicationTab') == null "];
        NSLog(@"hidden: %@", hidden);
        if(![hidden isEqualToString: @"false"]){
            return;
        }
        UIView *keyboard = [self findKeyboard];
        NSArray *arr = [keyboard subviews];
        //    UIView * impl = arr[0];
        //    NSArray *arr2 = [[[impl subviews][0] subviews][1] subviews];
        UIView *returnView = [self findKey: arr byType: @"Return-Key"];
        if(nil != returnView){
            CGRect rect = [returnView frame];
            button = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, rect.size.width, rect.size.height)];
            [[button layer] setCornerRadius: 4];
            [button setBackgroundColor:[UIColor colorWithRed:20/255.0 green:106/255.0 blue:255/255.0 alpha:1]];
            [button setTitle:@"发送"forState:UIControlStateNormal];
            [button setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
            [returnView addSubview:button];
            //允许return按钮事件触发
            [returnView setUserInteractionEnabled:YES];//允许与用户交互 
            [button addTarget:self
                       action:@selector(sendBtnDown:)
             forControlEvents:UIControlEventTouchDown];
            [button addTarget:self
                       action:@selector(sendBtnTouchUp:)
             forControlEvents:UIControlEventTouchUpInside];
            
            UITapGestureRecognizer *tapGesturRecognizer=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(imageViewTapped:)];
            //添加软键盘tap事件
            tapGesturRecognizer.delegate = self;
            //这里不会响应 因为在代理函数中已经阻止事件传递
            [keyboard addGestureRecognizer: tapGesturRecognizer];
            //不能给按键直接添加事件 因为被键盘视图拦截了
    //        UIView* shiftView = [self findKey: arr byType: @"Shift-Key"];
    //        if(nil != shiftView){
    //            [shiftView addGestureRecognizer: tapGesturRecognizer];
    //        }
            
        }
        if(timer){
            [timer invalidate];
            timer = nil;
        }
    }

4.软键盘tap事件代理函数实现：

/**
     keyboardView tap事件代理方法
     只需获取touch位置 去键盘中判断 如果位置在指定的几个按键中，就去执行一定的方法
     最后返回NO 阻止事件继续，否则键盘不能输入
     */
    - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
         NSLog(@"ges:UITouch");
        UIWebView *webview = (UIWebView *)self.webView;
        NSString *hidden = [webview stringByEvaluatingJavaScriptFromString:@"document.getElementById('communicationTab') == null "];
        NSLog(@"hidden: %@", hidden);
        if(![hidden isEqualToString: @"false"]){
            return NO;
        }
        UIView *keyboard = [self findKeyboard];
        
        NSArray *arr = [keyboard subviews];
        BOOL isTouchedInView = false;
        //添加功能键名称 这个可以自己打印看一下
        NSArray * keyTypes = @[@"Shift-Key",
                               @"More-Key",
                               @"TenKey-Chinese-Wubihua-Alphabet-Keyplane-Switch-Key",
                               @"TenKey-Chinese-Facemark",
                               @"TenKey-Wubihua-Keyplane-Switch-Key",
                               @"TenKey-Number-To-Number-Alternative-Keyplane-Switch-Key",
                               @"TenKey-Pinyin-Keyplane-Switch-Key",
                               @"TenKey-Chinese-Number-Keyplane-Switch-Key"];
        //touchedInKeyboardViewByArrayKey 判断touch的点是否在这些功能按键范围内
        isTouchedInView = [self touchedInKeyboardViewByArrayKey:arr byTypes:keyTypes byTouch:touch];
        if(isTouchedInView){
            NSLog(@"触摸点在视图内");
            if(timer){
                [timer invalidate];
                timer = nil;
            }
            timer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(createSendBtnInKeyBoardTimer:) userInfo:nil repeats:NO];
            return NO;
        }
        return NO;
    }
    //不会执行到这里来 但是最好还是写上
    - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceivePress:(UIPress *)press {
         NSLog(@"ges:UIPress");
        return NO;
    }

最后来几个截图：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNTcxNzE4_size_16_color_FFFFFF_t_70][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNTcxNzE4_size_16_color_FFFFFF_t_70 1][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNTcxNzE4_size_16_color_FFFFFF_t_70 2][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNTcxNzE4_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20181208204011995.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNTcxNzE4,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNTcxNzE4_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20181208204058244.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNTcxNzE4,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNTcxNzE4_size_16_color_FFFFFF_t_70 2]: /images/20220406/9e5e62c9265b4634afc9d84c47eb23c8.png