IOS--UIAlertView造成屏幕闪烁

在异步操作中,如果直接Show一个UIAlertView可能会造成屏幕闪烁(目前在iPhone5上发现),解决办法如下：

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示"
                                                    message:msg
                                                   delegate:self
                                          cancelButtonTitle:@"取消"
                                          otherButtonTitles:@"确定",nil];
//在主线程中打开
[alert performSelectorOnMainThread:@selector(show) withObject:nil waitUntilDone:YES];