检查是否显示UIAlertView [英] Check if a UIAlertView is showing

问题描述

我有一个发布HTTP数据并在出现错误时显示UIAlertView的方法.如果我有多个HTTP帖子，那么对于每个错误，我都会显示多个UIAlertView.

I have a method that posts HTTP data and displays a UIAlertView if there is an error. If I have multiple HTTP post I will show multiple UIAlertView for every error.

我只想在不显示其他UIAlertView的情况下显示UIAlertView. 我该如何确定?

I want to show a UIAlertView only if is not showing other UIAlertView. How can I determine this?

推荐答案

在调用的对象上，在调用UIAlertView上的show方法之前，设置一个ivar.

On the object that calls set an ivar before invoking the show method on your UIAlertView.

...

if (!self.alertShowing) {
    theAlert = [[UIAlertView alloc] initWithTitle:title message:details delegate:self cancelButtonTitle:nil otherButtonTitles:@"Okay", nil];
    self.alertShowing = YES;
    [theAlert show];
}

...

然后在警报的委托方法中，将标志ivar设置为no:

Then in your delegate method for the alert manage setting your flag ivar to no:

- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex
{
  ...
      self.alertShowing = NO;
}

如果您希望警报按顺序显示，我会发布通知以将每条消息添加到队列中，然后仅在解除警报后将消息从队列中移出.

If you want the alerts to show sequentially, I would post notifications to add each message to a queue and then only take a message off the queue after an alert is dismissed.

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