iOS关于手势的几种协议以及用法

• 手指触摸屏幕后回调的方法，返回NO则不再进行手势识别，方法触发等

-  (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch;

-开始进行手势识别时调用的方法，返回NO则结束，不再触发手势

- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer;

-是否支持多时候触发，返回YES，则可以多个手势一起触发方法，返回NO则为互斥

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer;

下面这个两个方法也是用来控制手势的互斥执行的

-这个方法返回YES，第一个手势和第二个互斥时，第一个会失效

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRequireFailureOfGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer NS_AVAILABLE_IOS(7_0);

-这个方法返回YES，第一个和第二个互斥时，第二个会失效

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldBeRequiredToFailByGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer NS_AVAILABLE_IOS(7_0);