2 UIAlertView一个接一个

Question

我有一个2 UIAlert显示我按下按钮.我希望第二个警报仅在我们按下第一个OK按钮时第一个UIAlert被解除时才可见.

我该怎么办？以下是我的代码:

- (IBAction)button:(id)sender {
 UIAlertView *view;
 view = [[UIAlertView alloc]
   initWithTitle: @"Message"
   message: @"Adding..."
   delegate: self
   cancelButtonTitle: @"OK" otherButtonTitles: nil];
 [view show];

 MyAppAppDelegate *appDelegate = (MyAppAppDelegate *)[[UIApplication sharedApplication] delegate];

 if (appDelegate.array_presets.count) {
  view = [[UIAlertView alloc]
    initWithTitle: @"Message"
    message: @"limit already reached"
    delegate: self
    cancelButtonTitle: @"OK" otherButtonTitles: nil];
  [view show];
 }

 [view autorelease];
}

Answer 1

为两个警报视图使用不同的标记.

alertView.tag = 1000; 

实现警报视图委托方法并检查标记值.使用第一个警报视图调用委托时,创建并显示第二个警报视图.

- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex
{
    if(alertView.tag == 1000)
    {
        //first alert view's button clicked
        UIAlertView *view = [[UIAlertView alloc]
                initWithTitle: @"Message"
                message: @"limit already reached"
                delegate: self
                cancelButtonTitle: @"OK" otherButtonTitles: nil];
        view.tag = 2000;
        [view show];
    }
    if(alertView.tag == 2000)
    {
        //handle second alert view's button action
    }

}