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SwiftUI Cookbook

SwiftUI Cookbook

By : Giordano Scalzo, Nzokwe
4.8 (10)
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SwiftUI Cookbook

SwiftUI Cookbook

4.8 (10)
By: Giordano Scalzo, Nzokwe

Overview of this book

SwiftUI is an innovative and simple way to build beautiful user interfaces (UIs) for all Apple platforms, right from iOS and macOS through to watchOS and tvOS, using the Swift programming language. In this recipe-based book, you’ll work with SwiftUI and explore a range of essential techniques and concepts that will help you through the development process. The recipes cover the foundations of SwiftUI as well as the new SwiftUI 2.0 features introduced in iOS 14. Other recipes will help you to make some of the new SwiftUI 2.0 components backward-compatible with iOS 13, such as the Map View or the Sign in with Apple View. The cookbook begins by explaining how to use basic SwiftUI components. Then, you’ll learn the core concepts of UI development such as Views, Controls, Lists, and ScrollViews using practical implementation in Swift. By learning drawings, built-in shapes, and adding animations and transitions, you’ll discover how to add useful features to the SwiftUI. When you’re ready, 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 while 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 found in building SwiftUI apps.
Table of Contents (15 chapters)
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Chapter 8: Driving SwiftUI with Data

In this chapter, we'll learn how to manage the state of single or multiple Views. In the declarative world of SwiftUI, you should consider Views as functions of their state, whereas in UIKit, in the imperative world, you are telling a view what it has to do depending on the state. In SwiftUI, the Views react to the changes.

SwiftUI has two ways of reaching these goals:

  • Using the binding property wrappers that SwiftUI provides
  • Using Combine, a new reactive framework Apple introduced in iOS 13

Property wrappers are a way to decorate a property introduced in Swift 5.1.

There are three different ways of using them in SwiftUI:

  • @State, to change state variables that belong to the same view. These variables should not be visible outside the view and should be marked as private.
  • @ObservedObject, to change state variables for multiple, but connected Views, for example, when there is a parent-child relationship. These...

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