我对iOSUIButton以编程方式处理点击有问题。我有一个UIButton:-(UIButton*)compareButton{if(!_compareButton){NSString*title=TITLE;NSDictionary*attributes=TITLE_ATTRIBUTES;NSAttributedString*attributedTitle=[[NSAttributedStringalloc]initWithString:titleattributes:attributes];_compareButton=[[UIButtonalloc]initWithFrame: