iOS UICollectionView: The Complete Guide, Second Edition (2014)
Chapter 1. Understanding Model-View-Controller on iOS
Chapter 2. Displaying Content Using UICollectionView
Chapter 3. Contextualizing Content
Chapter 4. Organizing Content with UICollectionViewFlowLayout
Chapter 5. Crafting Custom Layouts Using UICollectionViewLayout
Chapter 6. Adding Interactivity to UICollectionView