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)

Showing a PDF in SwiftUI

Since iOS 11, Apple has provided PDFKit, a robust framework to display and manipulate PDF documents in your applications.

As you can imagine, PDFKit is based on UIKit; however, in this recipe, we'll see how easy it is to integrate it with SwiftUI.

Getting ready

Let's create a new SwiftUI app in Xcode called PDFReaderApp.

We then need a PDF document to present. We are providing an example in the repo, but feel free to use a PDF document of your choice.

Copy the document in the project:

Fig. 13.25 – PDF document in the Xcode project

With the PDF document in the project, we are ready to implement our PDF viewer in SwiftUI.

How to do it

PDFKit provides a class called PDFView to render a PDF document.

Because the PDFView class is a subclass of UIView, it must be encapsulated in a UIViewRepresentable...