title: Show "WAIT or "LOADING" - Lable while creating new ViewController
body: <p>When pushing a button, I create a new ViewController and push it.<br>
  This takes 1,5 seconds. I want to display a "WAIT" or "LOADING" label, while creating the ViewController, but it would not been displayed.</p>
  
  <p>I tried to add an hidden label, but the view will not show it, when I set <code>hidden=NO</code>. Also a refresh of the view does not work. Any ideas?</p>
  
  <pre><code>- (IBAction)pushNext:(id)sender {
      //    UILabel *ll = (UILabel *) [self.view viewWithTag:7];
      //    ll.hidden = NO;
      //    label[7].hidden = NO;
      ViewController *gameViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"ViewController"];
      gameViewController.level = _nextLevel;
      [self.navigationController pushViewController:gameViewController animated:YES];
  }
  </code></pre>