一、监听触摸事件的做法 如果想监听一个view上面的触摸事件，之前的做法通常是：先自定义一个view，然后再实现view的touches方法，在方法内部实现具体处理代码通过touches方法监听view触摸事件，有很明显的几个缺点（1）必须得自定义view（2）由于是在view内部的touches方法中监听触摸事件，因此默认情况下，无法让其他外界对象监听view的触摸事件（需要通过代理）（3）不容易区分用户的具体手势行为iOS 3.2之后，苹果推出了手势识别功能（Gesture Recognizer），在触摸事件处理方面，大大简化了开发者的开发难度二、手势识别器为了完成手势识别，必须借助于手势识别器----UIGestureRecognizer利用UIGestureRecognizer，能轻松识别用户在某个view上面做的一些常见手势UIGestureRecognizer是一个抽象类，定义了所有手势的基本行为，使用它的子类才能处理具体的手势 UITapGestureRecognizer(轻拍)UIPinchGestureRecognizer(捏合，用于缩放)UIPanGestureRecognizer(拖拽)UISwipeGestureRecognizer(轻扫)UIRotationGestureRecognizer(旋转)UILongPressGestureRecognizer(长按)UIScreenEdgePanGestureRecognizer(屏幕边缘轻扫)（一）、轻拍手势 每一个手势识别器的用法都差不多，比如UITapGestureRecognizer的使用步骤如下：（1）创建手势识别器对象UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] init];（2）设置手势识别器对象的具体属性// 连续轻拍2次tap.numberOfTapsRequired = 2;// 需要2根手指一起触摸tap.numberOfTouchesRequired = 2;（3）添加手势识别器到对应的view上[self.iconView addGestureRecognizer:tap];（4）监听手势的触发[tap addTarget:self action:@selector(tapIconView:)];属性介绍：numberOfTouchesRequired   //需要多少根手指一起轻拍（默认为1根）numberOfTapsRequired　　  //需要轻拍多少下（默认为1）  实现方法  (二）、长按手势 UILongPressGestureRecognizer * longPressGr = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressToDo:)];        longPressGr.minimumPressDuration = 1.0;        [self.tableView addGestureRecognizer:longPressGr];    -(void)longPressToDo:(UILongPressGestureRecognizer *)gesture    {        if(gesture.state == UIGestureRecognizerStateBegan)        {            CGPoint point = [gesture locationInView:self.tableView];           NSIndexPath * indexPath = [self.tableView indexPathForRowAtPoint:point];            if(indexPath == nil) return ;           //add your code here       }    }   三）、旋转手势  UIRotationGestureRecognizer手势识别器，就像名称一样，这个类能用来监听和捕获旋转的手势，能帮助你创建出更直观的图形用户界面，比如一种场景，当你的应用中有一个展示图片的视图，用户需要通过旋转图片来调整图片的方向。         UIRotationGestureRecognizer这个类有一个rotation的属性，这个属性可以用来设置旋转的方向和旋转的弧度。旋转是从手指的初始位置（UIGestureRecognizerStateBegan）到最终位置(UIGestureRecognizerStateBegan)决定的。 为了对继承自UIView的UI元素进行旋转，你可以将旋转手势识别器的rotation属性传递给CGAffineTransformMakeRotation方法，以制作一个仿射转场UIRotationGestureRecognizer *rotationGestureRecognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotateView:)];      [view addGestureRecognizer:rotationGestureRecognizer]; - (void) rotateView:(UIRotationGestureRecognizer *)rotationGestureRecognizer  {      UIView *view = rotationGestureRecognizer.view;      if (rotationGestureRecognizer.state == UIGestureRecognizerStateBegan || rotationGestureRecognizer.state == UIGestureRecognizerStateChanged) {          view.transform = CGAffineTransformRotate(view.transform, rotationGestureRecognizer.rotation);          [rotationGestureRecognizer setRotation:0];      }  }  （四）、平移手势UIPanGestureRecognizer *panGesture=[[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(handlePanGesture:)];// [imageView addGestureRecognizer:panGesture];- (void)panGesture:(UIPanGestureRecognizer *)pan{    //获取平移手势在视图上的坐标    CGPoint point = [pan locationInView:self.view];    //把视图的中心点确定在平移手势的坐标上，即把视图拖动到平移点    self.mView.center = point;    NSLog(@"%@",NSStringFromCGPoint(point));}（五）、捏合手势self.pinchGestureRecognizer = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(handlePinches:)];      [self.myBlackLabel addGestureRecognizer:self.pinchGestureRecognizer];  -(void)handlePinches:(UIPinchGestureRecognizer *)paramSender{      if (paramSender.state == UIGestureRecognizerStateEnded) {          self.currentScale = paramSender.scale;      }else if(paramSender.state == UIGestureRecognizerStateBegan && self.currentScale != 0.0f){          paramSender.scale = self.currentScale;      }      if (paramSender.scale !=NAN && paramSender.scale != 0.0) {          paramSender.view.transform = CGAffineTransformMakeScale(paramSender.scale, paramSender.scale);      }  }  （六）、轻扫手势UISwipeGestureRecognizer *swipeGestureRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipes:)];    /*Swipes that are performed from right to left are to be detected*/    swipeGestureRecognizer.direction = UISwipeGestureRecognizerDirectionLeft;    /*just one finger needed*/    swipeGestureRecognizer.numberOfTouchesRequired = 1;    /*add it to the view*/    [self.view addGestureRecognizer:swipeGestureRecognizer];-(void)handleSwipes:(UISwipeGestureRecognizer *)paramSender{    NSLog(@"swipe to left");}八）、同时触发两个view的手势手势之间是互斥的，如果你想同时触发蛇和龙的view，那么需要实现协议(1)、遵循协议。(2)、同意添加多个手势。(3)、把self作为代理设置给手势