title: Lazy load pages in UIScrollView
body: <p>I have a UIScrollView that contains large images and am using paging to scroll between images. In order to save memory, I am loading only one image before and after the currently visible one and loading/releasing new images after a scroll has completed.</p>
  
  <p>The problem occurs when one scrolls quickly and <code>scrollViewDidEndDecelerating</code> is not called.</p>
  
  <p>How can I detect continuous scrolling? </p>
  
  <p>I could check item location on every <code>scrollViewDidScroll</code> but this seems a bit heavy...</p>