title: Reload UICollectionView when done with modal view
body: <p>I have a UICollectionView. When the user taps on an item, a modal form sheet window appears over the view. When the user taps done, I want to call <code>[self.collectionView reloadData]</code>, or something that does the equivalent. However, <code>viewWillAppear</code> does not work for the form sheet. Any idea how to get this to work?</p>