I did a presentation on UICollectionView at TACOW last night. The presentation is a little different than I normally do for a technical talk because I didn't go through the API, but rather focused on the three most important messages to remember when working with UICollectionView:
UICollectionViewis just likeUITableView.UICollectionViewseparates dequeuing logic from display and layout.UICollectionViewmakes complex layouts easy.
I didn't go over the minutiae of how to use them because there is the documentation for that. I focused on the what rather than the how – I tried to inspire my audience with what was possible instead of being tied down with implementation details.
The files, including the demo code, are available for download. License is MIT.