title: PresentModalViewController with some frame
body: <p>I want to present a modalViewController with a small frame and at the center of the view.</p>
  
  <p>Is that possible?</p>
  
  <p>Even if I set some frame to the viewController object, presentModelViewController is displaying that view in full screen mode.</p>
  
  <p>Also, I have used modalPresentationStyle as <code>UIModalPresentationFormSheet</code>. I want to have frame even smaller than that. </p>
  
  <p>How to do that?</p>