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)

Previewing the layout in dark mode

SwiftUI has built-in functionality to support dark mode. Xcode previews allow users to change from light to dark mode without adding any extra code within the view. This is done by changing the \.colorSheme environment value in the preview.

In this section, we will create a simple app with a Text view and then preview it in dark mode.

Getting ready

Create a new SwiftUI app named DarkModePreview.

How to do it…

As of the time of writing this book, there is a bug in Xcode 11 that prevents dark mode previews of SwiftUI views that do not contain a navigation view. We need to enclose the content we want to view within a navigation view. The steps are as follows:

  1. Open the ContentView.swift file.
  2. Add a NavigationView component to the body variable of the ContentView view:
    NavigationView {
            }
  3. Add a Text view inside the NavigationView component. You can replace the Text view...