title: Scroll the UICollectionView Background With The UICollectionView
body: <p>I am building an app that is presenting articles from a blog.  I am using UICollectionView to present images that are parsed from the blog for each of the cells.  This is my first go-round with a UICollectionView so I am wondering how you set up a background image of something like shelves that will scroll with the UICollectionView?</p>
  
  <p>I have tried using:</p>
  
  <pre><code>self.collectionView.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"shelves.jpg"]];
  </code></pre>
  
  <p>But this doesn't do anything.</p>