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)

Using mock data for previews

So far, we've built apps using our data. However, when dealing with large projects, data is usually obtained by making API calls. But that may be time-consuming and quickly become a bottleneck. The faster option would be to make some mock data available only at build time.

In this recipe, we will store some mock JavaScript Object Notation (JSON) data on insects in our Preview Content folder and fetch our data from the file instead of making API calls. JSON is lightweight format used for storing and transporting data.

Getting ready

Create a new SwiftUI project called UsingMockDataForPreviews.

To get access to the files used here, clone/download this project from GitHub: https://github.com/PacktPublishing/SwiftUI-Cookbook-2nd-Edition.

How to do it

We will add a JSON file with sample data to our Xcode project and design an app that elegantly displays that data. The steps are as follows:

  1. Open the recipe6 folder for this project...