Implementing a custom view-controller transition is one of those things that can take a little while to get used to. Implementing custom transitions involves implementing several objects and it's not always easy to make sense of how this works. This section aims to explain exactly how custom view-controller transitions work so you can add one more powerful tool to your developer toolbox.

A nicely-implemented custom view controller transition will entertain and amaze your users. Making your transitions interactive could even ensure that your users spend some extra time playing around with your app, which is exactly what you want. You will implement a custom transition for the Hello-Contacts app.

First, you'll learn how you can implement a custom modal transition. Once you've implemented that, you will learn about custom transitions...