在没有引用iOS 7的情况下查找UIAlertView [英] Find UIAlertView without having reference to it iOS 7

问题描述

我在我的专案中使用了程式码片段： UIAlertView参考它

以下是代码：

  +（UIAlertView *）getUIAlertViewIfShown {
 if（[[[UIApplication sharedApplication] windows] count] == 1）{
 return nil; 
} 
 
 UIWindow * window = [[[UIApplication sharedApplication] windows] objectAtIndex：1]; 
 if（[window.subviews count]> 0）{
 UIView * view = [window.subviews objectAtIndex：0]; 
 if（[view isKindOfClass：[UIAlertView class]]）{
 return（UIAlertView *）view; 
} 
} 
 return nil; 
} 
  

不幸的是，它在iOS 7中无法正常工作，视图。在调试时，我发现在循环中，它显示视图是类 UITransitionView 。非常混乱，因为我找不到这个视图类的任何快速文档。

任何想法如何解决这个问题？

UIAlertView 窗口不会出现在 - [UIApplication windows] / code>。事实上， UIAlertView 本身从不添加到任何窗口， - [UIAlertView window] 总是 nil 。相反，警报视图管理放置在 - [UIApplication keyWindow] 中的各种未记录的视图，而不引用回到警报视图。

iOS7中唯一真正的选项是实际跟踪您的提醒视图。

I was using a code snippet in my project answered here: UIAlertView without having reference to it

Here's the code:

+ (UIAlertView *) getUIAlertViewIfShown {
    if ([[[UIApplication sharedApplication] windows] count] == 1) {
        return nil;
    }

    UIWindow *window = [[[UIApplication sharedApplication] windows] objectAtIndex:1];
    if ([window.subviews count] > 0) {
        UIView *view = [window.subviews objectAtIndex:0];
        if ([view isKindOfClass:[UIAlertView class]]) {
            return (UIAlertView *) view;
        }
    }
    return nil;
}

Unfortunately its not working in iOS 7 and I'm unable to dismiss an alert view. While debugging I found that in the loop its showing that view is of class UITransitionView. Pretty confusing because I couldn't find any quick documentation for this view class.

Any ideas how can I fix this problem?

解决方案

In iOS7, the UIAlertView window does not appear in -[UIApplication windows]. In fact, the UIAlertView itself is never added to any window, -[UIAlertView window] is always nil. Instead, the alert view manages a variety of undocumented views placed in -[UIApplication keyWindow] with no reference back to the alert view.

Your only real option in iOS7 is to actually keep track of your alert views.

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