如何防止双击 UIButton 按钮取消操作？

发布于 2024-12-09 20:09:16 字数 883 浏览 1 评论 0原文

我有一个 UIButton，单击它后开始搜索数据。但是在搜索时，如果用户再次单击该按钮，则会取消搜索。

相关代码：

    - (void)searchAction:(UIButton *)sender {

    [sender removeTarget:self action:@selector(searchAction:) forControlEvents:UIControlEventTouchUpInside];
    [sender addTarget:self action:@selector(cancelSearch:) forControlEvents:UIControlEventTouchUpInside];  
    [animatedImages startAnimating];
    //action that should be done

}

- (void)cancelSearch:(UIButton *)sender {
    [sender removeTarget:self action:@selector(cancelSearch:) forControlEvents:UIControlEventTouchUpInside];
    [sender addTarget:self action:@selector(searchNearbyAction:) forControlEvents:UIControlEventTouchDown];
    [animatedImages stopAnimating];

}

所以基本思想是，当我单击它时，它的功能更改为取消，反之亦然。

问题是，当我第一次单击它时，它调用 searchAction 然后调用 <无缘无故地代码>cancelSearch。

有谁知道为什么会发生这种情况？

原文

I have a UIButton that when clicked starts searching for data. But while searching, if the user clicks on the button again it cancels the search.

Relevant Code:

    - (void)searchAction:(UIButton *)sender {

    [sender removeTarget:self action:@selector(searchAction:) forControlEvents:UIControlEventTouchUpInside];
    [sender addTarget:self action:@selector(cancelSearch:) forControlEvents:UIControlEventTouchUpInside];  
    [animatedImages startAnimating];
    //action that should be done

}

- (void)cancelSearch:(UIButton *)sender {
    [sender removeTarget:self action:@selector(cancelSearch:) forControlEvents:UIControlEventTouchUpInside];
    [sender addTarget:self action:@selector(searchNearbyAction:) forControlEvents:UIControlEventTouchDown];
    [animatedImages stopAnimating];

}

So the basic idea is that when i click on it its function change to cancel and vice-verca

The problem is that when I click on it the first time, it calls searchAction and then calls cancelSearch for no reason.

Does anyone know why this might be happening?

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绮烟 2024-12-16 20:09:16

解决方法是添加 BOOL 作为实例变量

BOOL canCancel;

，然后执行以下操作

- (void)buttonClicked:(UIButton *)sender {
      if (!canCancel) {
           // action that should be done
           canCancel = YES;
      } else if (canCancel) {
           // cancel action
           canCancel = NO;
      }
}

A workaround is to add a BOOL as an instance variable

BOOL canCancel;

and then do the following

- (void)buttonClicked:(UIButton *)sender {
      if (!canCancel) {
           // action that should be done
           canCancel = YES;
      } else if (canCancel) {
           // cancel action
           canCancel = NO;
      }
}

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