从 UIButton 视图中删除 Activity Indicator 子视图

Posted 2023-03-21

【中文标题】从 UIButton 视图中删除 Activity Indicator 子视图

【英文标题】：Remove Activity Indicator subview from UIButton view

【发布时间】：2015-11-13 17:15:41

【问题描述】：

我用几个按钮构建了一个界面。这些按钮从互联网上提取信息以获得它们的标题。我向视图中的每个按钮添加了一个 UIActivityIndi​​cator，如下所示：

- (void) addActivityIndicator 
    UIButton * button;

    for (int i = 1; i <= 10; i++)
        button = (UIButton *)[self viewWithTag:i];
        NSLog(@"Button: %i",i);
        [button setTitle:@"" forState:UIControlStateNormal];
        button.enabled = NO;

         UIActivityIndicatorView * buttonSpinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
        [buttonSpinner startAnimating];
        buttonSpinner.tag = i;
        buttonSpinner.frame = button.bounds;
        [button addSubview:buttonSpinner];
    

但是，我似乎无法访问个别指标来删除它们。

[(UIButton *)[self viewWithTag:tag] setTitle:[NSString stringWithFormat:@"%@",[self addTitle:i]] forState:UIControlStateNormal];
[(UIButton *)[self viewWithTag:tag] setEnabled:YES];
[(UIButton *)[self viewWithTag:tag] [buttonSpinner stopAnimating]];

有什么想法吗？

【参考方案1】：

    for (int i = 1; i <= 10; i++)
        button = (UIButton *)[self viewWithTag:i];
        NSLog(@"Button: %i",i);
        [button setTitle:@"" forState:UIControlStateNormal];
        button.enabled = NO;

         UIActivityIndicatorView * buttonSpinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
        [buttonSpinner startAnimating];
        buttonSpinner.tag = i*99;
        buttonSpinner.frame = button.bounds;
        [button addSubview:buttonSpinner];
    

然后，获取UIActivityIndicatorView

[(UIActivityIndicatorView *)[(UIButton *)[self viewWithTag:tag] viewWithTag:tag] stopAnimating];

【讨论】：

是的，我之前尝试过，但收到错误[UIButton stopAnimating]: unrecognized selector sent to instance

是的。我认为存在按钮标签和指示器标签相同的问题。

我不认为因为它们是相同的。您是否成功更改了按钮的标题？

我发现如果UIButtons的标签和UIActivityIndi​​catorView的标签是一样的，你的方法就失败了。但是，如果更改指示器视图的标记（示例标记*99），那么您的方法可以正常工作。

@@!。无论如何，问题已解决。太奇怪了。

【参考方案2】：

也许您可以尝试遍历子视图并将其删除？

UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];

UIActivityIndicatorView *toRemove;
for (UIView *view in button.subviews)

    if ([view isKindOfClass:[UIActivityIndicatorView class]])
    
        toRemove = (UIActivityIndicatorView *)view;
        break;
    

[toRemove removeFromSuperview];