title: Animating UICollectionView on orientation changes
body: <p>Consider a <a href="http://developer.apple.com/library/ios/#Documentation/UIKit/Reference/UICollectionView_class/Reference/Reference.html#//apple_ref/occ/cl/UICollectionView" rel="noreferrer">UICollectionView</a> that has a different number of items and a different layout (ie: spacing) on landscape and portrait orientation.</p>
  
  <p>What needs to be done for these changes to be animated when the device is rotated? I couldn't find any mention of how to handle rotations on the <a href="http://developer.apple.com/library/ios/#Documentation/WindowsViews/Conceptual/CollectionViewPGforIOS/Introduction/Introduction.html#//apple_ref/doc/uid/TP40012334-CH1-SW1" rel="noreferrer">Collection View Programming Guide</a>.</p>