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SwiftUI Cookbook

SwiftUI Cookbook

By : Giordano Scalzo, Nzokwe
4.3 (20)
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SwiftUI Cookbook

SwiftUI Cookbook

4.3 (20)
By: Giordano Scalzo, Nzokwe

Overview of this book

SwiftUI provides an innovative and simple way to build beautiful user interfaces (UIs) for all Apple platforms, from iOS and macOS through to watchOS and tvOS, using the Swift programming language. In this recipe-based cookbook, you’ll cover the foundations of SwiftUI as well as the new SwiftUI 3 features introduced in iOS 15 and explore a range of essential techniques and concepts that will help you through the development process. The cookbook begins by explaining how to use basic SwiftUI components. Once you’ve learned the core concepts of UI development, such as Views, Controls, Lists, and ScrollViews, using practical implementations in Swift, you'll advance to adding useful features to SwiftUI using drawings, built-in shapes, animations, and transitions. 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 by 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 encountered when building SwiftUI apps.
Table of Contents (17 chapters)
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Drawing using the Canvas API

One of the most powerful features of UIKit is the possibility of creating a subclass of UIView where we can draw directly into the graphic context using Core Graphic Framework's functions.

SwiftUI implemented this functionality similarly via the Canvas View, where we can draw directly in the Core Graphic's context.

In this recipe, will explore the Canvas View by implementing a simple app to draw using our finger.

Getting ready

Let's implement a SwiftUI app called Drawing.

How to do it…

The app will use a struct as a model to save the touches. Then, each model will be used to draw a line in a Canvas View. To do this, follow these steps:

  1. First, create the Line struct model and add a @State property to the main View:
    struct Line {
        var points: [CGPoint]
    }
    struct ContentView: View {
        @State var lines: [Line] = []
        
        var...

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