All the code in this book has been updated for Swift 5.2. Throughout the book, you will see how to use Swift’s capabilities and features to write better iOS applications. We have come to love Swift at Big Nerd Ranch and believe you will, too.

Other additions include new chapters on container view controllers and custom controls and a revamped chapter on animations. We have also updated various chapters to use the technologies and APIs introduced in iOS 11, 12, and 13.

This edition assumes that the reader is using Xcode 11.4 or later and running applications on an iOS 12 or later device.

Besides these obvious changes, we made thousands of tiny improvements that were inspired by questions from our readers and our students. Every chapter of this book is just a little better than the corresponding chapter from the sixth edition.