iOS 监听键盘高度，监听键盘出现 收回事件

   

1.系统的通知，无论什么键盘弹出的时候都会post这个事件

 [[NSNotificationCenterdefaultCenter]addObserver:selfselector:@selector(KeyboardWillShow:)name:UIKeyboardWillShowNotificationobject:nil];

2.name。// 很容易看懂

UIKIT_EXTERN NSNotificationNameconst UIKeyboardWillShowNotification__TVOS_PROHIBITED;

UIKIT_EXTERN NSNotificationNameconst UIKeyboardDidShowNotification__TVOS_PROHIBITED;

UIKIT_EXTERN NSNotificationNameconst UIKeyboardWillHideNotification__TVOS_PROHIBITED;

UIKIT_EXTERN NSNotificationNameconst UIKeyboardDidHideNotification__TVOS_PROHIBITED;

3.键盘出现时，点击view可收回，（实现在 带手势的view上添加了tableview 而tableview 会响应view的UITapGestureRecognizer手势，而无法点击， 所以在键盘收起时，移除手势UITapGestureRecognizer）

-(void)KeyboardWillShow:(NSNotification *)notification

{

//    NSLog(@"键盘出现");

    

        UITapGestureRecognizer *tap = [[UITapGestureRecognizeralloc]initWithTarget:selfaction:@selector(reKeyBoard)];

        [self.viewaddGestureRecognizer:tap];

//    [self.view endEditing:YES];

}

-(void)KeyboardWillHide:(NSNotification *)notification

{

    for (UIGestureRecognizer *gestin self.view.gestureRecognizers) {

        [self.viewremoveGestureRecognizer:gest];

    }

    

//    NSLog(@"键盘收起,%@",self.view.gestureRecognizers);

}