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How to blend views together

Paul Hudson    @twostraws   

Updated for Xcode 14.0 beta 1

When placing one view over another, you can control the way they overlap by using the blendMode() modifier. This contains a variety of ways you can mix colors together, such as using their difference or using a color burn – these will be familiar if you’ve used Core Graphics or something like Photoshop before.

To demonstrate this we could create a ZStack with two overlapping circles inside, where the second has a .multiply blend mode so that it darkens the colors behind it:

ZStack {
    Circle()
        .fill(.red)
        .frame(width: 200, height: 200)
        .offset(x: -50)
        .blendMode(.screen)

    Circle()
        .fill(.blue)
        .frame(width: 200, height: 200)
        .offset(x: 50)
        .blendMode(.screen)
}
.frame(width: 400)

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