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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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Snapshot testing SwiftUI views

In this recipe, we are going to explore a powerful way of testing views: snapshot testing.

While snapshot testing is more common in other technologies—for example, JavaScript and the Jest testing library (https://jestjs.io/docs/en/snapshot-testing.html)—its usage in the iOS community is still a niche practice.

The aim of snapshot testing is to verify that the layout of a view is preserved while the code of the app is evolved and changed. To achieve this, we take a snapshot of the view that acts as a reference image.

A snapshot test consists of two steps:

  • Taking a screenshot of a screen in a particular state
  • Verifying that the screen in the same state has the same look as the screenshot taken in the previous step

Another name for snapshot testing is characterization testing. If you want to know more, here is a definition by Michael Feathers, the guru of improving legacy code: https://michaelfeathers.silvrback.com...

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