title: Alert view is showing white rectangle in iOS7
body: <p>The following code works perfectly from iOS 5 to 6.1. I even have applications in store with that code:</p>
  
  <pre><code>-(void)showActivityIndicator
  {
      if(!mLoadingView) //
      {
          mLoadingView = [[UIAlertView alloc] initWithTitle:@"" message:@"" delegate:self cancelButtonTitle:nil otherButtonTitles:nil];
          mLoadingView.tag = kAlertViewTag;
      }
  
      [mLoadingView show];
  }
  
  - (void)willPresentAlertView:(UIAlertView *)alertView
  {
      if (alertView.tag == kAlertViewTag)
      {
          UIActivityIndicatorView *actInd = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite];
          actInd.frame = CGRectMake(128.0f, 45.0f, 25.0f, 25.0f);
          [alertView addSubview:actInd];
          [actInd startAnimating];
  
          UILabel *l = [[UILabel alloc]init];
          l.text = NSLocalizedString(@"PRODUCT_PURCHASE_INDICATOR_TITLE", @"Please wait...");
          l.font = [UIFont fontWithName:@"Helvetica" size:16];
  
          float strWidth = [l.text sizeWithFont:l.font].width;
          float frameWidth = alertView.frame.size.width;
          l.frame = CGRectMake((frameWidth - strWidth)/2, -25, 210, 100);
  
          l.textColor = [UIColor whiteColor];
          l.shadowColor = [UIColor blackColor];
          l.shadowOffset = CGSizeMake(1.0, 1.0);
          l.backgroundColor = [UIColor clearColor];
          [alertView addSubview:l];
      }
  }
  </code></pre>
  
  <p>It will show alert view without buttons and with activity indicator and label. However in iOS7 I can see only white rounded rectangle, no activity indicator. </p>
  
  <p>What can I do to have this work from iOS 5 to 7?</p>
  
  <p>Update:</p>
  
  <p>To be more descriptive I'm adding screenshots. The following is iOS 5 to 6.1 screenshot. Works fine there.</p>
  
  <p><img src="https://i.stack.imgur.com/SRKnV.png" alt="enter image description here"></p>
  
  <p>The following is iOS7. As you can see even the size is smaller. Looks like it's not fully initialized or something.</p>
  
  <p><img src="https://i.stack.imgur.com/l22vm.png" alt="enter image description here"></p>