title: UIScrollView with "Circular" scrolling
body: <p>I am trying to make "Circular" scrolling in my UIScrollView, but unsuccessful.</p>
  
  <p>What I want to do:
  if uiscrollview reaches end, it should move to start
  if uiscrollview at start and moving back, it should move to end</p>
  
  <p>Appending scrollview isn't good way in my situation (other methods should get "page id")</p>
  
  <p>Have you any ideas?</p>