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SwiftUI Cookbook

SwiftUI Cookbook

By : Giordano Scalzo, Nzokwe
4.3 (20)
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SwiftUI Cookbook

SwiftUI Cookbook

4.3 (20)
By: Giordano Scalzo, Nzokwe

Overview of this book

SwiftUI provides an innovative and simple way to build beautiful user interfaces (UIs) for all Apple platforms, from iOS and macOS through to watchOS and tvOS, using the Swift programming language. In this recipe-based cookbook, you’ll cover the foundations of SwiftUI as well as the new SwiftUI 3 features introduced in iOS 15 and explore a range of essential techniques and concepts that will help you through the development process. The cookbook begins by explaining how to use basic SwiftUI components. Once you’ve learned the core concepts of UI development, such as Views, Controls, Lists, and ScrollViews, using practical implementations in Swift, you'll advance to adding useful features to SwiftUI using drawings, built-in shapes, animations, and transitions. You’ll understand how to integrate SwiftUI with exciting new components in the Apple development ecosystem, such as Combine for managing events and Core Data for managing app data. Finally, you’ll write iOS, macOS, and watchOS apps by sharing the same SwiftUI codebase. By the end of this SwiftUI book, you'll have discovered a range of simple, direct solutions to common problems encountered when building SwiftUI apps.
Table of Contents (17 chapters)
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Chapter 11: SwiftUI Concurrency with async await

One of the most important features of Swift 5.5, released together with Xcode 13, is the introduction of the async and await keywords. With async and await, we can manage asynchronous concurrent code almost as if it was synchronous code.

Concurrency means that different pieces of code run at the same time. Often, we must orchestrate these pieces of code to create sequences of events to present the results in a view.

Before Swift 5.5, the most common way of creating a sequence of concurrent code was by using a completion block. When the first part of code finishes, we call a completion block where we start the second piece of code. This works and is manageable if we have only two asynchronous functions to synchronize. But it would become quickly unmaintainable with multiple functions and different ways of synchronizing them. For example, we could have two asynchronous functions to wait before starting the third one. With completion...

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