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)

Rendering a gradient view in SwiftUI

SwiftUI has several ways of rendering gradients. A gradient can be used to fill a shape, or even fill a border, as you will see in the Rendering a border with a gradient recipe later in this chapter.

In this recipe, we will be focused on understanding what types of gradients we can use with SwiftUI and how to define them.

Getting ready

Create a SwiftUI app called GradientViewsApp.

How to do it...

SwiftUI has three different types of gradients:

  • Linear gradients
  • Radial gradients
  • Angular gradients

In each one, we can define the list of the colors that will smoothly transform into each other and, depending on the type of gradient, we can also define some additional properties such as the direction, radius, and angles of the transformation.

To explore all of them, we are going to add a a Picker component to select the type of gradient.

The ContentView struct will have a Text component that shows the selected...