This book has been completely revised for iOS 13, macOS 10.15 Catalina, Xcode 11 and Swift 5. Section 4 of this book also covers the latest technologies introduced by Apple during WWDC 2019, which are Dark Mode, Mac Catalyst, Swift UI and sign in with Apple.

To complete all the exercises in this book, you will need:

• A Mac computer running macOS 10.15 Catalina or later
• Xcode 11.2.1 or later

To check if your Mac supports macOS 10.15 Catalina, see this link: https://support.apple.com/en-us/HT210222. If your Mac is supported, you can update macOS using Software Update in System Preferences.

To get the latest version of Xcode, you can download it from the Mac App Store.

Most of the exercises can be completed without an Apple Developer account and use the iOS Simulator. If you wish to test the app you are developing on an actual iOS device, you will need a free or paid Apple Developer account, and the following chapters require a paid Apple Developer account:

Chapter 26, Getting Started with Sign In with Apple
Chapter 27, Testing and Submitting Your App to the App Store

Instructions on how to get a paid Apple Developer account are in Chapter 27, Testing and Submitting Your App to the App Store.