iOS 手势的用法

    iOS 手势类 ： UIGestureRecognizer（继承于NSObject基类）

继承于UIGestureRecognizer类的有六个子类，分别是：

   

UILongPressGestureRecognizer

UIPanGestureRecognizer

UIPinchGestureRecognizer

UIRotationGestureRecognizer

UITapGestureRecognizer

UISwipeGestureRecognizer 

/*第一个子类*/

用到了UISwipeGestureRecognizer，先记录下

   它的属性：方向（direction  property），和touch次数（numberOfTouchesRequired  property）；

typedef enum {   UISwipeGestureRecognizerDirectionRight = 1 << 0,   UISwipeGestureRecognizerDirectionLeft  = 1 << 1,   UISwipeGestureRecognizerDirectionUp    = 1 << 2,   UISwipeGestureRecognizerDirectionDown  = 1 << 3} UISwipeGestureRecognizerDirection;

•    示例：

  UISwipeGestureRecognizer *gestureRight = [[UISwipeGestureRecognizeralloc] init];

  //手势的方向

      [gestureRight setDirection:UISwipeGestureRecognizerDirectionRight];

  //添加事件

      [gestureRightaddTarget:selfaction:@selector(gestureRight:)];

  //设置触摸次数，默认为1次

      gestureRight.numberOfTouchesRequired =2;

  
  

    [self.viewaddGestureRecognizer:gestureRight];

   

- (void)gestureRight:(id)sender {

    //code there

}

/*第二个子类*/

UIPanGestureRecognizer（与view中的坐标有关）

属性：

•    maximumNumberOfTouches  property
•    minimumNumberOfTouches  property
• 这个可以使用多个手指
• • – translationInView:
  • – setTranslation:inView:
  • – velocityInView: