Book Image

SwiftUI Cookbook - Second Edition

By : Giordano Scalzo, Edgar Nzokwe
Book Image

SwiftUI Cookbook - Second Edition

By: Giordano Scalzo, Edgar 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)

Chapter 10: Driving SwiftUI with Combine

In this chapter, we'll learn how to manage the state of SwiftUI Views using Combine. In the Worldwide Developers Conference (WWDC) 2019, Apple not only introduced SwiftUI but also Combine, a perfect companion to SwiftUI for managing the declarative change of state in Swift.

In recent years, given the success of Functional Reactive Programming (FRP) in different sectors of the industry, the same concept is being used in the iOS ecosystem. It was first implemented with ReactiveCocoa, the original framework in Objective-C. That framework was converted into Swift with ReactiveSwift. Finally, it was converted into RxSwift, which became the default framework for performing FRP in iOS.

In typical Apple way, Apple took the best practices that have matured over years of trial and error from the community, and instead of acquiring either ReactiveSwift or RxSwift, Apple decided to reimplement their concepts, simplify their version, and specialize...