iOS开发各类手势识别

iOS开发中手势识别有六种： 

轻击手势（TapGestureRecognizer）, 

轻扫手势 （SwipeGestureRecognizer）, 

长按手势（LongPressGestureRecognizer）, 

拖动手势（PanGestureRecognizer）, 

捏合手势（PinchGestureRecognizer）, 

旋转手势（RotationGestureRecognizer）,

使用手势很简单，分为两步：

建立手势实例。当建立手势时，指定一个回调方法，当手势开始，改变、或结束时，回调方法被调用。

添加到须要识别的View中。每一个手势只对应一个View，当屏幕触摸在View的边界内时，若是手势和预约的同样，那就会回调方法。

1，点击手势（TapGestureRecognizer）

1. UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapGesture:)];
   tapGesture.numberOfTapsRequired = 1; //点击次数
   tapGesture.numberOfTouchesRequired = 1; //点击手指数
   [self.view addGestureRecognizer:tapGesture];
    
   //轻击手势触发方法
   -(void)tapGesture:(UITapGestureRecognizer *)sender
   {
       //your code
   }

2，长按手势（LongPressGestureRecognizer）

UILongPressGestureRecognizer *longPressGesture = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressGesture:)];
//设置长按时间
longPressGesture.minimumPressDuration = 0.5;
[self.view addGestureRecognizer:longPressGesture];
//长按手势触发方法
-(void)longPressGesture:(id)sender
{
     UILongPressGestureRecognizer *longPress = sender;
     if (longPress.state == UIGestureRecognizerStateBegan)
     {
         //your code
     }
}
说明：长按手势的经常使用状态以下
开始：UIGestureRecognizerStateBegan
改变：UIGestureRecognizerStateChanged
结束：UIGestureRecognizerStateEnded
取消：UIGestureRecognizerStateCancelled
失败：UIGestureRecognizerStateFailed

3，旋转手势（RotationGestureRecognizer）

UIRotationGestureRecognizer *rotationGesture = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationGesture:)];
[self.view addGestureRecognizer:rotationGesture];
//旋转手势触发方法
-(void)rotationGesture:(id)sender
{
    UIRotationGestureRecognizer *gesture = sender;
    if (gesture.state==UIGestureRecognizerStateChanged)
    {
        _imageView.transform=CGAffineTransformMakeRotation(gesture.rotation);
    }
    if(gesture.state==UIGestureRecognizerStateEnded)
    {
        [UIView animateWithDuration:1 animations:^{
            _imageView.transform=CGAffineTransformIdentity;//取消形变
        }];
    }
}

4，拖动手势（PanGestureRecognizer）

UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panGesture:)];
[self.view addGestureRecognizer:panGesture];
 
//拖动手势触发方法
-(void) panGesture:(id)sender
{
    UIPanGestureRecognizer *panGesture = sender;
    CGPoint movePoint = [panGesture translationInView:self.view];
    //your code
}

5，轻扫手势（SwipeGestureRecognizer）

UISwipeGestureRecognizer *swipeGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeGesture:)];
//设置轻扫的方向
swipeGesture.direction = UISwipeGestureRecognizerDirectionRight; //向右
[self.view addGestureRecognizer:swipeGesture];
UISwipeGestureRecognizer *swipeGestureLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeGesture:)];
//设置轻扫的方向
swipeGestureLeft.direction = UISwipeGestureRecognizerDirectionLeft; //向左
[self.view addGestureRecognizer:swipeGestureLeft];
//轻扫手势触发方法
-(void)swipeGesture:(id)sender
{
    UISwipeGestureRecognizer *swipe = sender;
    if (swipe.direction == UISwipeGestureRecognizerDirectionLeft)
    {
        //向左轻扫
    }
    if (swipe.direction == UISwipeGestureRecognizerDirectionRight)
    {
        //向右轻扫
    }
}

6，捏合手势（PinchGestureRecognizer）

UIPinchGestureRecognizer *pinchGesture = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchGesture:)];
[self.view addGestureRecognizer:pinchGesture];
    ////捏合手势触发方法
-(void) pinchGesture:(id)sender
{
    UIPinchGestureRecognizer *gesture = sender;
    //手势改变时
    if (gesture.state == UIGestureRecognizerStateChanged)
    {
        self.View.transform = CGAffineTransformMakeScale(gesture.scale, gesture.scale);
    }
  
}