title: Show modal view controller with custom frame in iPad
body: <p>I want to show a modal <code>UIViewController</code> with a custom frame in iPad, centered on top of its parent view controller.</p>
  
  <p>I tried using a form sheet but as far I know the frame and shadow effect can't be changed.</p>
  
  <pre><code>vc.modalPresentationStyle = UIModalPresentationFormSheet;
  [self presentModalViewController:cv animated:YES];
  </code></pre>
  
  <p>I also tried using a popover but as far as I know either I can't center it or I can't hide the arrow.</p>
  
  <p>Is there another way to show modal view controllers? Is it possible to solve this problem by using form sheets or popovers?</p>