ios- Gesture

 手势优先级requireGestureRecognizerToFail，创建另一个有联系的手势识别器，只要另一个手势状态为UIGestureRecognizerStateFailed这个手势才会被相应。如果另一个手势正在被响应，那么这个手势不会被响应

  EXCLiveRoomManger.shared.liveContainerViewController?.liveScrollView.scrollView.panGestureRecognizer.require(toFail: vc.webView.scrollView.panGestureRecognizer)
        EXCLiveRoomManger.shared.liveViewController?.panGesture.require(toFail: vc.webView.scrollView.panGestureRecognizer)
直播间内的scrollView的panGestureRecognizer和，清屏模式的panGesture，在弹出webView.scrollView.panGestureRecognizer后不生效

//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);