NEW: Subscribe to Hacking with Swift+ and accelerate your learning! >>

Gradients

Paul Hudson    @twostraws   

SwiftUI gives us three kinds of gradients to work with, and like colors they are also views that can be drawn in our UI.

Gradients are made up of several components:

  • An array of colors to show
  • Size and direction information
  • The type of gradient to use

For example, a linear gradient goes in one direction, so we provide it with a start and end point like this:

LinearGradient(gradient: Gradient(colors: [.white, .black]), startPoint: .top, endPoint: .bottom)

The inner Gradient type used there can also be provided with gradient stops, which let you specify both a color and how far along the gradient the color should be used.

In contrast, radial gradients move outward in a circle shape, so instead of specifying a direction we specify a start and end radius – how far from the center of the circle the color should start and stop changing. For example:

RadialGradient(gradient: Gradient(colors: [.blue, .black]), center: .center, startRadius: 20, endRadius: 200)

The last gradient type is called an angular gradient, although you might have heard it referred to elsewhere as a conic or conical gradient. This cycles colors around a circle rather than radiating outward, and can create some beautiful effects.

For example, this cycles through a range of colors in a single gradient, centered on the middle of the gradient:

AngularGradient(gradient: Gradient(colors: [.red, .yellow, .green, .blue, .purple, .red]), center: .center)

All of these gradients are able to stand alone as views, or be used as part of a modifier – you can use them as the background for a text view, for example.

Hacking with Swift is sponsored by Instabug

SPONSORED Are you tired of wasting time debugging your Swift app? Instabug’s SDK is here to help you minimize debugging time by providing you with complete device details, network logs, and reproduction steps with every bug report. All data is attached automatically, and it only takes a line of code to setup. Start your free trial now and get 3 months off exclusively for the Hacking with Swift Community.

Start your free trial!

Sponsor Hacking with Swift and reach the world's largest Swift community!

BUY OUR BOOKS
Buy Pro Swift Buy Swift Design Patterns Buy Testing Swift Buy Hacking with iOS Buy Swift Coding Challenges Buy Swift on Sundays Volume One Buy Server-Side Swift (Vapor Edition) Buy Advanced iOS Volume One Buy Advanced iOS Volume Two Buy Advanced iOS Volume Three Buy Hacking with watchOS Buy Hacking with tvOS Buy Hacking with macOS Buy Dive Into SpriteKit Buy Swift in Sixty Seconds Buy Objective-C for Swift Developers Buy Server-Side Swift (Kitura Edition) Buy Beyond Code

Was this page useful? Let us know!

Average rating: 4.8/5

Link copied to your pasteboard.