title: Removing a view controller from UIPageViewController
body: <p>It's odd that there's no straightforward way to do this. Consider the following scenario:</p>
  
  <ol>
  <li>You have a page view controller with 1 page.</li>
  <li>Add another page (total 2) and scroll to it.</li>
  <li><strong>What I want is,</strong> when the user scrolls back to the first page, the 2nd page is now removed and deallocated, and the user can no longer swipe back to that page.</li>
  </ol>
  
  <p>I've tried removing the view controller as a child view controller after the transition is completed, but it still lets me scroll back to the empty page (it doesn't "resize" the page view)</p>
  
  <p>Is what I want to do possible?</p>