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How to render a gradient

Paul Hudson    @twostraws   

Updated for Xcode 13.0

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

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

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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)
    .font(.largeTitle)
    .background(
        LinearGradient(gradient: Gradient(colors: [.white, .red, .black]), startPoint: .leading, endPoint: .trailing)
    )

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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:

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

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

Circle()
    .fill(
        AngularGradient(gradient: Gradient(colors: [.red, .yellow, .green, .blue, .purple, .red]), center: .center)
    )
    .frame(width: 200, height: 200)

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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:

Circle()
    .strokeBorder(
        AngularGradient(gradient: Gradient(colors: [.red, .yellow, .green, .blue, .purple, .red]), center: .center, startAngle: .zero, endAngle: .degrees(360)),
        lineWidth: 50
    )
    .frame(width: 200, height: 200)

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