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 on different devices

SwiftUI allows developers to preview designs on multiple screen sizes and device types at the same time using the .previewDevice() modifier. In this recipe, we will create a simple app that displays an image and some text on multiple devices.

Getting ready

Let's create a SwiftUI app called named PreviewOnDifferentDevices.

How to do it…

We will add an image and some text to the ContentView struct and modify the preview struct to show the content on multiple devices. The steps are as follows:

  1. Click on the Preview Content folder in the Xcode navigation pane.
  2. Import the friendship.png image from the Chapter 3 resource files (it can be found at
  3. Click on the ContentView.swift file from the navigation pane to open it in the editor window.
  4. Replace the initial Text view in ContentView struct's body variable...