iOS 阻止子视图响应父视图手势

实现手势以下代理方法：

#pragma mark --UIGestureRecognizerDelegate

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
    if ([touch.view isDescendantOfView:self.sonView]) {
        return NO;
    }
    return YES;
}

参考：https://www.jianshu.com/p/6a31fafa1ca3