Book Image

SwiftUI Cookbook - Second Edition

By : Giordano Scalzo, Edgar Nzokwe
Book Image

SwiftUI Cookbook - Second Edition

By: Giordano Scalzo, Edgar 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)

Drawing a custom shape

SwiftUI's drawing functionality permits more than just using the built-in shapes: creating a custom shape is just a matter of creating a Path component with the various components and then wrapping it in a Shape object.

In this recipe, we will work through the basics of custom shape creation by implementing a simple rhombus, which is a geometric shape with four equal, straight sides that resembles a diamond.

Getting ready

Create a new single-view app with SwiftUI called RhombusApp.

How to do it…

As we mentioned in the introduction, we are going to implement a Shape object that defines the way our custom view must be visualized:

  1. Let's add a Rhombus struct:
    struct Rhombus: Shape {
        func path(in rect: CGRect) -> Path {
            Path() { path in
                path.move(to: CGPoint(x: rect.midX,
      ...