警报视图不起作用

问题描述

我有一个按钮，该按钮向 webservice 发送调用并返回一些值.我想显示一个没有按钮的警报框，直到值从 web 服务返回.但是 alertWait 在收到值后显示.我尝试使用设置警报功能并从按钮的开头调用，但这也显示在接收值的末尾.我哪里出错了，这是我的代码.

I have a button and the button sends a call to webservice and returns some values. I want to show an alert box without buttons until the value returns from webservice. But the alertWait is displaying after receiving the values. i tried using setting up a function for alert and calling in from the start of the button but that too displays at the end of receiving values. Where am i going wrong here is my code.

    - (IBAction)UploadButton:(id)sender
    {
      // Initializtion of some elements

        UIAlertView *alertWait;

        alertWait = [[UIAlertView alloc] initWithTitle:@"Please Wait..."
                                            message:nil delegate:self cancelButtonTitle:nil otherButtonTitles: nil];

        [alertWait show];


       //Web service call statements


        if ([status intValue] == 0)
      {
            NSLog(@"It is zero");
            [alertWait dismissWithClickedButtonIndex:0 animated:YES];
            UIAlertView *alert =[ [UIAlertView alloc]initWithTitle:@"Success" message:@"You have successfully uploded the document and waiting for approval" delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
            [alert show];
        }

   }

推荐答案

将服务调用放在后台线程上，就像下面更改的示例代码:

Put the service calls on a background thread, just like example code changed below :

- (IBAction)UploadButton:(id)sender
{
          // Initializtion of some elements
            UIAlertView *alertWait;

            alertWait = [[UIAlertView alloc] initWithTitle:@"Please Wait..." message:nil delegate:self cancelButtonTitle:nil otherButtonTitles: nil];

            [alertWait show];

    dispatch_async(dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{

            //Web service call statements

           dispatch_async(dispatch_get_main_queue(), ^{
                //Do your UI operations here
                if ([status intValue] == 0)
                {
                    NSLog(@"It is zero");
                    [alertWait dismissWithClickedButtonIndex:0 animated:YES];
                    UIAlertView *alert =[ [UIAlertView alloc]initWithTitle:@"Success" message:@"You have
successfully uploded the document and waiting for approval" delegate:self
cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
                    [alert show];
                }
            });
       });

}

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