如何自定义一个UIButton，并阻止父视图手势触发

关于手势和响应链这篇文章，我觉得已经讲的很不错了
https://www.jianshu.com/p/53e03e558cbd
但是里面有一个问题，当我们自己写一个继承于UIControl的自定义Button控件时，假设功能只是响应单击，可以这样写

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    [super touchesBegan:touches withEvent:event];
    [self sendActionsForControlEvents:UIControlEventTouchUpInside];
}

会发现当我们单击时，自定义的Button控件触发了事件，父视图手势也触发了事件。但是如果继承UIButton，就不会有这样的事情发生。
补全touche的四个个方法

 (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    [super touchesMoved:touches withEvent:event];
    NSLog(@"%s", __FUNCTION__);
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    [super touchesEnded:touches withEvent:event];
    NSLog(@"%s", __FUNCTION__);
}

- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
{
    [super touchesCancelled:touches withEvent:event];
    NSLog(@"%s", __FUNCTION__);
}

最后发现，如果是继承UIButton,事件并没有被cancel掉，如果直接继承UIControl，事件其实还是被父视图的手势给Cancel了。所以才会出现这种和UIButton完全不同的现象。
其实在UIView有一个分类方法

// called when the recognizer attempts to transition out of UIGestureRecognizerStatePossible if a touch hit-tested to this view will be cancelled as a result of gesture recognition
// returns YES by default. return NO to cause the gesture recognizer to transition to UIGestureRecognizerStateFailed
// subclasses may override to prevent recognition of particular gestures. for example, UISlider prevents swipes parallel to the slider that start in the thumb
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer NS_AVAILABLE_IOS(6_0);

在自定义的Button中，重写这个方法，返回NO，就可以表现出和UIButton一模一样的行为了。