为什么UIAlertView不显示？ [英] Why isn't UIAlertView Showing?

问题描述

由于某些原因，屏幕变暗并冻结，警报未显示...有人可以帮忙吗？

For some reason screen gets dark and freezes, alert is not shown... can someone please help?

提前致谢！

} else {
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Hello!" 
                                                message:@"Hello!" delegate:self 
                                      cancelButtonTitle:@"Done" 
                                      otherButtonTitles:nil];
    [alert show];
    [alert release];
}

推荐答案

你可能正在打电话<$从后台线程c $ c> show ，在主线程上调用它，如下所示：

You are probably calling show from a background thread, call it on the main thread like this:

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Hello!" 
                                            message:@"Hello!" delegate:self 
                                            cancelButtonTitle:@"Done" 
                                            otherButtonTitles:nil];
[alert performSelectorOnMainThread:@selector(show)
                            withObject:nil
                            waitUntilDone:NO];
[alert release];

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