从 UIButton 视图中删除 Activity Indicator 子视图

Question

我构建了一个带有多个按钮的界面。这些按钮从互联网上提取信息作为他们的标题。我将 UIActivityIndi​​cator 添加到视图中的每个按钮，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，我似乎无法访问单个指标来删除它们。

[(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？

Answer 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，得到 UIActivityIndicatorView

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

Answer 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];