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.

You can download the example code files for this book from your account at www.packt.com. If you purchased this book elsewhere, you can visit www.packtpub.com/support and register to have the files emailed directly to you.

You can download the code files by following these steps:

1. Log in or register at www.packt.com.
2. Select the Support tab.
3. Click on Code Downloads.
4. Enter the name of the book in the Search box and follow the onscreen instructions.

Once the file is downloaded, please make sure that you unzip or extract the folder using the latest version of:

• WinRAR/7-Zip for Windows
• Zipeg/iZip/UnRarX for Mac
• 7-Zip/PeaZip for Linux

The code bundle for the book is also hosted on GitHub at https://github.com/PacktPublishing/iOS-13-Programming-for-Beginners. In case there's an update to the code, it will be updated on the existing GitHub repository.

We also have other code bundles from our rich catalog of books and videos available at https://github.com/PacktPublishing/. Check them out!

We also provide a PDF file that has color images of the screenshots/diagrams used in this book. You can download it here: https://static.packt-cdn.com/downloads/9781838821906_ColorImages.pdf.

Visit the following link to check out videos of the code being run:

http://bit.ly/2RhXuHk

There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "So, this is a very simple function, named serviceCharge()."

A block of code is set as follows:

func functionName(paramater1: parameterType, ...) -> returnType {
    code
}

Bold: Indicates a new term, an important word, or words that you see onscreen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "Launch Xcode and click Create a new Xcode project:"