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How to render a gradient

Paul Hudson    @twostraws   

Updated for Xcode 12.0

SwiftUI gives us a variety of gradient options, all of which can be used in a variety of ways. For example, you could render a text view using a white to black linear gradient like this:

Text("Hello World")
    .padding()
    .foregroundColor(.white)
    .background(LinearGradient(gradient: Gradient(colors: [.white, .black]), startPoint: .top, endPoint: .bottom))

The colors are specified as an array and you can have as many as you want – by default SwiftUI will space them equally. So, we could go from white to red to black like this:

Text("Hello World")
    .padding()
    .foregroundColor(.white)
    .background(LinearGradient(gradient: Gradient(colors: [.white, .red, .black]), startPoint: .top, endPoint: .bottom))

To make a horizontal gradient rather than a vertical one, use .leading and .trailing for your start and end points:

Text("Hello World")
    .padding()
    .foregroundColor(.white)
    .background(LinearGradient(gradient: Gradient(colors: [.white, .red, .black]), startPoint: .leading, endPoint: .trailing))

For alternative gradient styles, try RadialGradient or AngularGradient. As an example, this creates a radial gradient through a variety of colors, starting from the center of the circle and going out to the edges:

let colors = Gradient(colors: [.red, .yellow, .green, .blue, .purple])
let conic = RadialGradient(gradient: colors, center: .center, startRadius: 50, endRadius: 200)
return Circle()
    .fill(conic)
    .frame(width: 400, height: 400)

And this creates an angular gradient (often called a conic gradient), cycling through various colors then returning to the beginning:

let colors = Gradient(colors: [.red, .yellow, .green, .blue, .purple, .red])
let conic = AngularGradient(gradient: colors, center: .center)
return Circle()
    .fill(conic)

Because all three gradient types conform to the ShapeStyle protocol, you can use them for backgrounds, fills, and strokes. For example, this uses our rainbow conical gradient as a thick inner stroke for a circle:

let colors = Gradient(colors: [.red, .yellow, .green, .blue, .purple, .red])
let conic = AngularGradient(gradient: colors, center: .center, startAngle: .zero, endAngle: .degrees(360))
return Circle()
    .strokeBorder(conic, lineWidth: 50)
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