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 previews in UIKit

Xcode previews provide a fast and easy way to quickly preview the current state of your view. Previews were introduced in Xcode 11 together with SwiftUI. You might think previews can only be used on SwiftUI apps, but you'll be wrong. UIKit apps can also make use of this great new feature!

In this recipe, we will set up a UIKit view to make it "previewable" in the Xcode canvas.

Getting ready

If you have not yet done so, download the GitHub repository for this book from

How to do it…

We will change the build settings of UIKit to add iOS 13+ capabilities to the debug build, and then set up the UIKit page to preview our code during design and debugging. The steps are as follows:

  1. Open the initial iOS 12 XCode project located at