我创建了一个自定义UIButton并将其放在导航Controller的右侧。但是当我点击它时，它不会触发buttonTapped方法和打印输出Testing123，我做错了什么？-(void)viewDidAppear:(BOOL)animated{[superviewDidAppear:animated];UIImage*btnImage=[[UIImagealloc]init];BOOLunlike=NO;if(unlike){btnImage=[UIImageimageNamed:@"ic_favorite_border_48pt.png"];}else{btnImage=[UI