iOS解雇UIAlertView正在展示另一个

问题描述

我有一个Utils类，当触发某些通知时会显示UIAlertView。有没有办法在显示新的UIAlertViews之前解雇任何打开的UIAlertViews？

I have a Utils class which shows UIAlertView when certain notifications are triggered. Is there a way to dismiss any open UIAlertViews before showing a new one?

当我的应用程序使用

[self checkViews:application.windows];

在applicationDidEnterBackground上

on applicationDidEnterBackground

- (void)checkViews:(NSArray *)subviews {
    Class AVClass = [UIAlertView class];
    Class ASClass = [UIActionSheet class];
    for (UIView * subview in subviews){
        if ([subview isKindOfClass:AVClass]){
            [(UIAlertView *)subview dismissWithClickedButtonIndex:[(UIAlertView *)subview cancelButtonIndex] animated:NO];
        } else if ([subview isKindOfClass:ASClass]){
            [(UIActionSheet *)subview dismissWithClickedButtonIndex:[(UIActionSheet *)subview cancelButtonIndex] animated:NO];
        } else {
            [self checkViews:subview.subviews];
        }
    }
}

这使得applicationDidEnterBackground变得简单因为我可以使用application.windows

This makes it easy on applicationDidEnterBackground as I can use application.windows

我可以使用AppDelegate或类似的东西来获取所有视图，循环它们并关闭任何UIAlertViews吗？

Can I use the AppDelegate or anything similar to get all the views, loop through them and dismiss any UIAlertViews?

推荐答案

for (UIWindow* window in [UIApplication sharedApplication].windows) {
  NSArray* subviews = window.subviews;
  if ([subviews count] > 0)
    if ([[subviews objectAtIndex:0] isKindOfClass:[UIAlertView class]])
      [(UIAlertView *)[subviews objectAtIndex:0] dismissWithClickedButtonIndex:[(UIAlertView *)[subviews objectAtIndex:0] cancelButtonIndex] animated:NO];
}

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