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)

Unit testing an app based on Combine

I must confess that the topic of this recipe is very close to my heart: unit testing an app based on Combine.

We are going to implement an app that retrieves a list of GitHub users and shows them in a list view.

The code is pretty similar to the one in the Fetching remote data using Combine and visualizing it in SwiftUI recipe. But in this case, we'll learn how to unit test it – something that, even if it is very important, isn't well covered in documentation and tutorials.

Getting ready

Let's open Xcode and create a SwiftUI app called GithubUsers, paying attention to enabling the tests by checking the Include Tests check box:

Figure 10.13 – Creating a SwiftUI app with tests enabled

Then, add the githubUsers.json file to the GithubUsersTests folder. You can find it in this book's GitHub repository at https://github.com/PacktPublishing/SwiftUI-Cookbook-2nd-Edition-/blob/main...