UIGestureRecognizer基类是一个抽象类，我们主要是使用它的子类（名字包含链接，可以点击跳到ios Developer library，看官方文档）：

UITapGestureRecognizer

UIPinchGestureRecognizer

UIRotationGestureRecognizer

UISwipeGestureRecognizer

UIPanGestureRecognizer

UILongPressGestureRecognizer

从名字上我们就能知道， Tap（点击）、Pinch（捏合）、Rotation（旋转）、Swipe（滑动，快速移动，是用于监测滑动的方向的）、Pan （拖移，慢速移动，是用于监测偏移的量的）以及 LongPress（长按）。

- (void)viewDidLoad

{

    [super viewDidLoad];

    UITapGestureRecognizer *gesture=[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapClick:)];

    [self.view addGestureRecognizer:gesture];

    gesture.numberOfTapsRequired=1;

    gesture.numberOfTouchesRequired=1;

}

-(void)tapClick:(UITapGestureRecognizer *)gesture{

}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event  //手指触摸屏幕时报告UITouchPhaseBegan事件

{

}

- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event   //在手指在屏幕上移动时报告UITouchPhaseMoved事件

{

}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event   //在手指离开屏幕时报告UITouchPhaseEnded事件

{

}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event    //在因接听电话或其他因素导致取消触摸时报告

{

}

GestureRecognizer