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 curved custom shape

Following on from the 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 Heart.

How to do it…

We are going to follow the same steps we implemented in the 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 midpoint of each side, we must add some convenient properties to the CGRect struct.

Let's do this by performing the following steps:

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