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)

Adding SwiftUI to an existing app

In this recipe, we will learn how to navigate from a UIKit view to a SwiftUI view while passing a text as argument from our UIKit storyboard to our SwiftUI view.

A storyboard is a visual representation of the user interface in UIKit. The Main.storyboard file is to UIKit as the ContentView.swift file is to SwiftUI. They both are the default home views created when you start a new project.

The recipe begins with a UIKit project that contains a button.

Getting ready

To prepare for this recipe, perform the following steps:

  1. Clone or download the GitHub project at
  2. Open the StartingPoint folder located at SwiftUI-Cookbook/Chapter01 - Using the basic SwiftUI Views and Controls/10 - Adding SwiftUI to UIKit and double-click on the AddSwiftUIToUIKitApp.xcodeproj file. It opens up the UIKit project in Xcode.

How to do it…

We will add a NavigationController to the UIKit...