判断子view是否添加到父view上

判断子view是否添加到父view上

 if ([subViewisDescendantOfView:parentView]) {

              NSLog(@"已添加上");

}

应用一：判断是自view touch不响应

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

    if( [subViewisDescendantOfView:parentView]) {

        returnNO;//不响应

 }

    return YES;//响应

}