Your contacts app is complete for now. In the coming chapters, we'll work on it a bit more. We've already covered a lot of ground on the way to iOS mastery. We started by creating a UIViewController that contains a UITableView. We used Auto Layout to pin the edges of the UITableView to the edges of ViewController's main view. We also explored the Contacts.framework and understood how to set up our app so it can access the user's contact data.

Then, you saw how to create a custom cell for contacts to be rendered in. You learned that cells get reused by UITableView so it can maintain perfect scrolling behavior. You also saw how to reset cells when needed. Finally, you learned how to implement some delegate methods of UITableView. This allows your app to respond to actions such as cell selection, reordering, and deletion.

If you're intrigued by UITableView and its capabilities right now, that makes sense! There's a valid reason that so many apps make use of the UITableView. It's a really powerful piece of UI that has many uses. Exploring Apple's documentation and programming guides on UITableView will show you that there's still a lot more to learn about all the things a UITableView can do. This chapter showed you the most important concepts, and you should now have a mental model of how UITableView works and performs optimizations. Next up? Converting our UITableView to its sibling, the UICollectionView.