访问 UIViewController 类别中的 UIButton

Question

我正在创建一个 UIViewController 的简单类别，它增加了在视图顶部显示按钮以显示聊天的可能性 window。

@interface UIViewController (ChatButton)
- (void)showChatButtonFromTop;
- (void)showChatButtonFromBottom;
- (void)hideButton;
@end

现在在我创建一个按钮并显示它的方法中：

- (void)showChatButtonFromTop
{        
    UIButton* chatBtn = [self constructButtonWithWidth:buttonAxisSize X:buttonX Y:buttonY];
    [self.view addSubview:chatBtn];
}

但我还需要隐藏按钮：

- (void)hideButton
{
    // confusion!  
}

如何获得该按钮？类别不允许属性，那么如何存储引用？

Answer 1

添加按钮查看时，给按钮添加标签

chatBtn.tag = 1234;
[self.view addSubview:chatBtn];

当您尝试隐藏按钮访问它的标签时

- (void)hideButton
{
    UIButton *chatBtn = (UIButton *)[self.view viewWithTag:1234];
    [chatBtn setHidden:YES];
}

访问 UIViewController 类别中的 UIButton

Access UIButton in a category of a UIViewController

iphone

cocoa-touch

uikit

ios