Book Image

SwiftUI Cookbook

By : Giordano Scalzo, Edgar Nzokwe
Book Image

SwiftUI Cookbook

By: Giordano Scalzo, Edgar 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)

Using mock data for previews

So far, we've built apps using our own data. However, when building an app for a client, you may want to use mock data that closely resembles client data. Using API calls early on in development may be a bottleneck. In this recipe, we will introduce a faster option, using JSON data stored in a file.

In this recipe, we will read Insect data from a JSON file and display the content in a SwiftUI view.

Getting ready

Let's create a new project called UsingMockDataForPreviews.

If not yet done, clone this book's GitHub repository from https://github.com/PacktPublishing/SwiftUI-Cookbook.

How to do it…

We will add our mock data to the Xcode project, then proceed to design a SwiftUI view that elegantly displays the data. The steps are as follows:

  1. From the cloned GitHub repository, open the Resources file, then drag and drop the insectData.json file into the Preview Content folder of the Xcode project:

    Figure 3.16 –...