我对如何通过用户单击ui按钮删除uiview感到困惑，场景加载后ui按钮立即加载。uibutton也没有得到响应。我应该如何设置它？请帮忙，非常感谢。-(void)viewWillAppear:(BOOL)animated{UIView*holderView=[[UIViewalloc]initWithFrame:CGRectMake(0,50,_imagePicker.selectedImage.size.width,_imagePicker.selectedImage.size.height)];UIImageView*imageView=[[UIImageViewalloc]in