我们有时候会遇到当两个手势（UIGestureRecognizer）放在不同view上，滑动公共区域时，只能响应上面view的手势。
那怎么修改它们的响应优先级或者同时让它们都响应呢？

1.修改响应优先级

UIGestureRecognizer类中有两个方法

//让自身这个手势事件响应优先级低于其它手势事件
//只是在对于比它响应优先级低的手势调用
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldBeRequiredToFailByGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer  {
    return YES;
}

//让自身这个手势事件响应优先级高于其它手势事件
//只是在对于比它响应优先级高的手势调用
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRequireFailureOfGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
    return YES;
}

还有一种是直接对两个手势

    //让gestureTwo响应优先级低于gestureOne
    [gestureTwo requireGestureRecognizerToFail:gestureOne];

2.同时响应

//共存  A手势或者B手势 代理方法里shouldRecognizeSimultaneouslyWithGestureRecognizer   有一个是返回YES，就能共存
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
    return YES;
}

最后时测试代码IOSStudyTest