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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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Using @State to drive a View's behavior

As we mentioned in the introduction, when a state variable belongs only to a single view, its changes are bound to the components using the @State property wrapper.

To understand this behavior, we are going to implement a simple to-do list app, where a static set of to-dos are changed to done when we tap on the row.

In the next recipe, Using @Binding to pass a state variable to child Views, we'll expand on this recipe, adding the possibility of adding new to-dos.

Getting ready

Let's start this recipe by creating a SwiftUI app called StaticTodoList.

How to do it…

To demonstrate the use of the @State variable, we are going to create an app that holds its state in a list of Todo structs: each Todo can be either undone or done, and we can change its state by tapping on the related row.

When the user taps on one row in the UI, they change the done state in the related Todo struct:

  1. Let's start...

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