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An iOS Developer's Guide to SwiftUI

You're reading from   An iOS Developer's Guide to SwiftUI Design and build beautiful apps quickly and easily with minimum code

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Product type Paperback
Published in May 2024
Publisher Packt
ISBN-13 9781801813624
Length 446 pages
Edition 1st Edition
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Author (1):
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Michele Fadda Michele Fadda
Author Profile Icon Michele Fadda
Michele Fadda
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Table of Contents (25) Chapters Close

Preface 1. Part 1: Simple Views
2. Chapter 1: Exploring the Environment – Xcode, Playgrounds, and SwiftUI FREE CHAPTER 3. Chapter 2: Adding Basic UI Elements and Designing Layouts 4. Chapter 3: Adding Interactivity to a SwiftUI View 5. Part 2: Scrollable Views
6. Chapter 4: Iterating Views, Scroll Views, FocusState, Lists, and Scroll View Reader 7. Chapter 5: The Art of Displaying Grids 8. Part 3: SwiftUI Navigation
9. Chapter 6: Tab Bars and Modal View Presentation 10. Chapter 7: All About Navigation 11. Part 4: Graphics and Animation
12. Chapter 8: Creating Custom Graphics 13. Chapter 9: An Introduction to Animations in SwiftUI 14. Part 5: App Architecture
15. Chapter 10: App Architecture and SwiftUI Part I: Practical Tools 16. Chapter 11: App Architecture and SwiftUI Part II – the Theory 17. Part 6: Beyond Basics
18. Chapter 12: Persistence with Core Data 19. Chapter 13: Modern Structured Concurrency 20. Chapter 14: An Introduction to SwiftData 21. Chapter 15: Consuming REST Services in SwiftUI 22. Chapter 16: Exploring the Apple Vision Pro 23. Index 24. Other Books You May Enjoy

Bridging old GCD and structured concurrency

In general, if you can, you should avoid mixing concurrency paradigms. However, sometimes, you have old code that uses GCD and you want to use it, and maybe you can’t or don’t want to modify the old asynchronous code you need to invoke, adapting it to the more modern structured concurrency approach, because it may be part of a library, and you may not have access to the library source code.

withCheckedThrowingContinuation is a Swift function that bridges between asynchronous code and traditional completion handler-based code. It’s particularly useful when you have an API that uses completion handlers and you want to use it within Swift’s modern async/await-structured concurrency model.

The withCheckedThrowingContinuation function takes as an argument a closure that itself takes a single argument – a continuation. This continuation can be resumed exactly once, either by returning a value with resume...

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