title: UIPageViewController black background when sliding more
body: <p>I'm using UIPageViewController to create some introduction slides for my objective-c app. </p>
  
  <p>But when I slide more in the first slide to left or slide last slider image more to right, I can see a black background. </p>
  
  <p>How can I prevent user sliding more left in first slider &amp; sliding more right in the last slider. </p>
  
  <p>Thanks a lot. </p>
  
  <p><a href="https://i.stack.imgur.com/n6HI5.png" rel="noreferrer"><img src="https://i.stack.imgur.com/n6HI5.png" alt="enter image description here"></a></p>
  
  <p><a href="https://i.stack.imgur.com/WSiDM.png" rel="noreferrer"><img src="https://i.stack.imgur.com/WSiDM.png" alt="enter image description here"></a></p>