title: UIView with a custom shaped frame containing content
body: <p>I would like to take <img src="https://i.stack.imgur.com/YEwNY.png" alt="this image"> and place some <code>UIViews</code> inside the empty area.</p>
  
  <p>How can I create a custom <em>container view</em> (the phone) with a "content" area that is equal to that empty space and is resizable?</p>
  
  <p>I was using trial and error to get its <em>sub views</em> in there, but as soon as I resized the phone view, it all went out of whack.</p>