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)

Implementing SwiftUI views using Playground

One of the most surprising and useful innovations brought by Swift is the Playground, a simple file that contains Swift code and that can be seen and modified in real time without waiting for a full cycle of a rebuild.

Again, Playground supports UIKit, but since SwiftUI can be quickly embedded in a UIKit component, we can use Playground for rapidly prototyping SwiftUI views too.

Getting ready

Create a Playground file (File | New | Playground) in Xcode called SwiftUIPlayground.

How to do it

The power of Playground is that you can make a change and immediately see the result. Importing the PlaygroundSupport framework, you can also render a UIViewController class to be shown during the Playground session.

We are going to define a simple SwiftUI view to be rendered in Playground:

  1. Let's start by importing the needed frameworks:
    import PlaygroundSupport
    import SwiftUI
  2. Then we create an extension to the Text component...