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)

Drawing a curved custom shape

Following up on the previous Drawing a custom shape recipe, what if we want to define a shape that is made up not only of straight lines, but also has a curved line in it? In this recipe, we'll build a heart-shaped component using the arc and curve primitives of Path.

Getting ready

As usual, create a SwiftUI app called HeartApp.

How to do it...

We are going to follow the same steps we implemented in the previous Drawing a custom shape recipe, adding curves and an arc from one point to another.

Since the control points of a heart shape are in the mid point of each side, we must add some convenient properties to the CGRect struct.

Let's do this with the following steps:

  1. Let's add the properties to return the coordinates from each of the quarters:
    extension CGRect {
        var quarterX: CGFloat {
            minX + size.height/4