title: UIRefreshControl at Bottom of UICollectionView (load more data)
body: <p>I have a <code>UICollectionView</code> which displays images from an online database. I first load 10 images, and then when the user scrolls to the bottom of the <code>UICollectionView</code> I load another 10 images in the background and refresh the view. I accomplish this using the following method : </p>
  
  <pre><code>func collectionView(collectionView: UICollectionView, willDisplayCell cell: UICollectionViewCell, forItemAtIndexPath indexPath: NSIndexPath) {
      if (self.localFeedContent != nil &amp;&amp; self.localFeedContent!.count &gt; 0) {
           if indexPath.item == (self.localFeedContent!.count-1) {
          loadMoreData()
      }
      }
  
  }
  </code></pre>
  
  <p>Now this works perfectly fine, however there is no indication to the user that the process is complete and unless he scrolls further down, he won't notice that new content has been added. I would like to implement a <code>UIRefreshControl</code> which will be attached to the bottom of the <code>UICollectionView</code> and mimic the same exact behaviour as the regular <code>UIRefreshControl</code> on top of the screen does. I have already implemented one on top of the screen, however I am not sure how to do this at the bottom as well. </p>