iOS手势UIGestureRecognizer


UIGestureRecognizer是一个抽象类，定义了所有手势的基本行为，它有6个子类处理具体的手势：

1.UITapGestureRecognizer （任意手指任意次数的点击）

// 点击次数

numberOfTapsRequired

// 手指个数

numberOfTouchesRequired   

  1. UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizer alloc] init];  
  2. [tapGestureRecognizer addTarget:self action:@selector(gestureRecognizerHandle:)];  
  3. [tapGestureRecognizer setNumberOfTapsRequired:2];  
  4. [tapGestureRecognizer setNumberOfTouchesRequired:2];  
  5. [self.view addGestureRecognizer:tapGestureRecognizer];  
  6. [tapGestureRecognizer release];  

2.UIPinchGestureRecognizer （两个手指捏合动作）

// 手指捏合，大于1表示两个手指之间的距离变大，小于1表示两个手指之间的距离变小

scale

// 手指捏合动作时的速率（加速度）

velocity

  1. UIPinchGestureRecognizer *pinchGestureRecognizer = [[UIPinchGestureRecognizer alloc] init];  
  2. [pinchGestureRecognizer addTarget:self action:@selector(gestureRecognizerHandle:)];  
  3. [self.view addGestureRecognizer:pinchGestureRecognizer];  
  4. [pinchGestureRecognizer release];  

3.UIPanGestureRecognizer (摇动或者拖拽)

// 最少手指个数

minimumNumberOfTouches

// 最多手指个数

maximumNumberOfTouches

  1. UIPanGestureRecognizer *panGestureRecognizer = [[UIPanGestureRecognizer alloc] init];  
  2. [panGestureRecognizer addTarget:self action:@selector(gestureRecognizerHandle:)];  
  3. [panGestureRecognizer setMinimumNumberOfTouches:1];  
  4. [panGestureRecognizer setMaximumNumberOfTouches:5];  
  5. [self.view addGestureRecognizer:panGestureRecognizer];  
  6. [panGestureRecognizer release];  

4.UISwipeGestureRecognizer (手指在屏幕上滑动操作手势)

// 滑动手指的个数

numberOfTouchesRequired

// 手指滑动的方向 （Up,Down,Left,Right）

direction 

  1. UISwipeGestureRecognizer *swipeGestureRecognizer = [[UISwipeGestureRecognizer alloc] init]; 
  2. [swipeGestureRecognizer addTarget:self action:@selector(gestureRecognizerHandle:)];  
  3. [swipeGestureRecognizer setNumberOfTouchesRequired:2];  
  4. [swipeGestureRecognizer setDirection:UISwipeGestureRecognizerDirectionRight];  
  5. [self.view addGestureRecognizer:swipeGestureRecognizer];  
  6. [swipeGestureRecognizer release];  

5.UIRotationGestureRecognizer (手指在屏幕上旋转操作)

// 旋转方向，小于0为逆时针旋转手势，大于0为顺时针手势

rotation

// 旋转速率

velocity

  1. UIRotationGestureRecognizer *rotationGestureRecognizer = [[UIRotationGestureRecognizer alloc] init];  
  2. [rotationGestureRecognizer addTarget:self action:@selector(gestureRecognizerHandle:)];  
  3. [self.view addGestureRecognizer:rotationGestureRecognizer];  
  4. [rotationGestureRecognizer release];  

6.UILongPressGestureRecognizer (长按手势)

// Default is 0. The number of full taps required before the press for gesture to be recognized

numberOfTapsRequired

// 需要长按的手指的个数

numberOfTouchesRequired

// 需要长按的时间，最小为0.5s

minimumPressDuration

// 手指按住允许移动的距离

allowableMovement

  1. UILongPressGestureRecognizer *longPressGestureRecognizer = [[UILongPressGestureRecognizer alloc] init];  
  2. [longPressGestureRecognizer addTarget:self action:@selector(gestureRecognizerHandle:)];  
  3. [longPressGestureRecognizer setMinimumPressDuration:1.0f];  
  4. [longPressGestureRecognizer setAllowableMovement:50.0];  
  5. [self.view addGestureRecognizer:longPressGestureRecognizer];  
  6. [longPressGestureRecognizer release];  

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