title: iOS Present Viewcontroller getting black screen
body: <p>I am trying present ViewController I have created with StoryBoards:</p>
  
  <pre><code> AuthViewController *authViewController = [[AuthViewController alloc] init];
      UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:authViewController];
      UIViewController *vc  = [[[[UIApplication sharedApplication] windows] firstObject] rootViewController];
      [vc presentViewController:nav animated:YES completion:nil];
  </code></pre>
  
  <p>But getting it with black screen. What could be the issue?</p>