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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 has over 28 years of experience in the Engineering and IT fields, including over 15 years spent in leadership and management roles. During this time, he has consistently delivered projects on time and within budget. Jon is recognized for successfully leading cross-functional agile teams, combining technical expertise with a strategic vision to guide projects from start to finish. He attributes much of his success to his ability to build highly productive teams that emphasize collaboration, communication, and a clear sense of purpose. 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 are the challenges that the field of information technology provides and there is nothing more exhilarating to him than overcoming a challenge. Outside of his professional endeavors, Jon enjoys spending quality time with his kids and partner. Residing in Tallahassee, Florida, he takes full advantage of the outdoor activities available in the area. Paddle boarding, hiking, running, and biking are activities that Jon particularly enjoys, reflecting his passion for an active and adventurous lifestyle.

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