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)

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.

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

Getting ready

Create a SwiftUI app called GradientViews.

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 colors that will smoothly transform into each other. Depending on the type of gradient, we can 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 Picker component to select the type of gradient.

The ContentView struct will have a Text component that shows the selected gradient. We can do this by performing the following steps:

  1. Let's start by adding a style, including a...