Now that you have an understanding about how collection views fit within an iOS app using the Model-View-Control (MVC) paradigm, it’s time to get to the good stuff: code. This chapter starts off easy and shows how you can use Storyboards or .xibs to set up collection views, and then it shows you how to set them up in code.
UIScrollView, so the chapter takes a brief detour to see how you can use that to your advantage with
UIScrollViewDelegate. You begin customizing actual content to show to your users using cell reuse before finishing off with a case study on performance.
Traditionally, .xib files were used to lay out interface code ...