title: Present a modal view using fade-in animation
body: <p>I presented a login screen as follows modally. Correct me if I am not right.</p>
  
  <pre><code>   UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
     UIViewController *ivc = [storyboard instantiateViewControllerWithIdentifier:@"login"];//LOOK AT NEXT LINE
     [self presentViewController:ivc animated:YES completion:nil];
  </code></pre>
  
  <p>The login screen does appear but the animation is a slide up one. I prefer a fade in and fade our animation. How can I do this?</p>