title: presentViewController shows black page
body: <pre><code>- (IBAction)submitButtonClicked:(id)sender{
      NSLog(@"here");
      SuccessOrFailViewController *sfvc = [[SuccessOrFailViewController alloc] init];
      [self presentViewController:sfvc animated:NO completion:NULL];
  }
  </code></pre>
  
  <p>I am trying to open a new page when a user clicks the submit button in the app. However, this opens completely black screen with nothing on it. How do I make it open the viewController instead ?</p>