title: How to make sticky headers in UICollectionView on iOS7?
body: <p>I'm using <a href="http://blog.radi.ws/post/32905838158/sticky-headers-for-uicollectionview-using" rel="nofollow">this solution</a> to make sticky headers in collection view and it works well on iOS6. But in iOS7 if the "Extend edges under top bars" option is checked then the header sticks to the origin of the view which is then behind the navigation bar. </p>
  
  <p>So for now I disabled that option but I'd really like to tweak that solution to make it work when the edges are extended (in order to have the nice blurry effect when the content scrolls behind the navigation bar).</p>
  
  <p>Can someone help me with that? Or does someone have any other suggestions to accomplish the same goal?</p>