In this chapter, you added a collection view to the Explore screen in Main.storyboard and added a new file, ExploreViewController.swift, which contains the implementation of the ExploreViewController class. You made ExploreViewController the view controller for the scene containing the collection view. Then, you added an outlet to connect the collection view to ExploreViewController and made ExploreViewController the data source and delegate for the collection view. You added a collection view section header to the collection view, configured a custom color that was used as the color for the collection view cells, and set the size for the collection view cells and collection view section header. Finally, you added a button to display a second view and configured a Cancel button to dismiss it.
When you run the app in the Simulator, your Explore screen will now display 20...
