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)

The best of both worlds – integrating UIKit into SwiftUI

SwiftUI was announced at WWDC 2019 and is only available on iOS 13 devices or later. Due to its relative newness, SwiftUI lacks broad API coverage compared to UIKit. For example, as of April 2020, UICollectionViews, UITextView, UIKit APIs for displaying grids, and multiline texts are not available in SwiftUI. There is therefore a need to implement certain UIKit APIs in SwiftUI.

This recipe goes over the required process for integrating UIKit into SwiftUI. We will create a project that wraps instances of UIActivityIndicatorView to display an indicator in SwiftUI.

Getting ready

Open Xcode and create a SwiftUI project named UIKitToSwiftUI.

How to do it…

UIKit views are displayed in SwiftUI by using the representable protocol. Follow these steps to implement UIActivityIndicatorView in SwiftUI.

  1. Within the Xcode menu, click File | New | File and select SwiftUI view. Name the view ActivityIndicator...