title: Using UIPageViewController and making the view look like it's flapping
body: <p>I'm wondering if there's a way to animate the very first view in <code>UIPageViewController</code> so that it looks like the one of the page corners is flapping a little bit? As if a little breeze bristles the pages when you first arrive on this particular screen.</p>
  
  <p>This to add some sort of UI affordance to indicate that screen can be swiped. The content we're displaying with <code>UIPageViewController</code> doesn't take up the entire screen like a book does but would like to make it more obvious to the user that they can use gestures to navigate horizontally.</p>
  
  <p>Any suggestions would be helpful.</p>