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 = [[UISwipeGestureRecognizer
alloc]
init];
//手势的方向

    [gestureRight setDirection:UISwipeGestureRecognizerDirectionRight];

//添加事件
    [gestureRight
addTarget:self
action:@selector(gestureRight:)];

//设置触摸次数，默认为1次

    gestureRight.numberOfTouchesRequired =
2;

    [self.view
addGestureRecognizer: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: