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Mastering Swift 5.3

You're reading from Mastering Swift 5.3 Upgrade your knowledge and become an expert in the latest version of the Swift programming language

Product type Paperback

Published in Nov 2020

Publisher Packt

ISBN-13 9781800562158

Length 418 pages

Edition 6th Edition

Languages

Swift

Concepts

Application Development

Author (1):

Jon Hoffman

View More author details

Table of Contents (23) Chapters

Preface

1. Taking the First Steps with Swift

2. Swift Documentation and Installing Swift FREE CHAPTER

3. Learning about Variables, Constants, Strings, and Operators

4. Optional Types

5. Using Swift Collections

6. Control Flow

7. Functions

8. Classes, Structures, and Protocols

9. Protocols and Protocol Extensions

10. Protocol-Oriented Design

11. Generics

12. Error Handling and Availability

13. Custom Subscripting

14. Working with Closures

15. Advanced and Custom Operators

16. Concurrency and Parallelism in Swift

17. Custom Value Types

18. Memory Management

19. Swift Formatting and Style Guide

20. Adopting Design Patterns in Swift

21. Other Books You May Enjoy

22. Index

The availability attribute

Developing our applications for the latest Operating System (OS) version gives us access to all the latest features for the platform that we are developing for. However, there are times when we want to also target older platforms. Swift allows us to use the availability attribute to safely wrap code to run only when the correct version of the operating system is available. This was first introduced in Swift 2.

The availability attribute is only available when we use Swift on Apple platforms.

The availability block essentially lets us, if we are running the specified version of the operating system or higher, run this code or otherwise run some other code. There are two ways in which we can use the availability attribute. The first way allows us to execute a specific block of code that can be used with an if or a guard statement. The second way allows us to mark a method or type as available only on certain platforms.

The availability...

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Authors (1)

Jon Hoffman

Jon Hoffman

Jon Hoffman has over 25 years of experience in the field of information technology. Over these years, Jon has worked in the areas of system administration, network administration, network security, application development, and architecture. Currently, Jon works as a senior software engineer for Syn-Tech Systems. Jon has developed extensively for the iOS platform since 2008. This includes several apps that he has published in the App Store, apps that he has written for third parties, and numerous enterprise applications. He has also developed mobile applications for the Android and Windows platforms. What really drives Jon the challenges that the field of information technology provides and there is nothing more exhilarating to him than overcoming a challenge. Some of Jon's other interests are spending time with his family, robotic projects, and 3D printing. Jon also really enjoys Tae Kwon Do, where he and his oldest daughter Kailey earned their black belts together early in 2014, Kim (his wife) earned her black belt in December 2014, and his youngest daughter Kara is currently working towards her black belt.

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