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How to mask one view with another

Paul Hudson    @twostraws   

Updated for Xcode 14.0 beta 1

SwiftUI gives us the mask() modifier for masking one with another, which means you can mask an image using text or an image using an image, or more.

For example, this creates a 300x300 image of stripes, then masks it using the text “SWIFT!” so that the letters act as a cut out for the image:

Image("laser-show")
    .resizable()
    .frame(width: 300, height: 300)
    .mask(
        Text("SWIFT!")
            .font(.system(size: 72))
    )

Download this as an Xcode project

The text “SWIFT!” forms a mask through which we can see a laser show.

The mask() modifier is different from clipShape(), because it also applies any transparency from the masking view – you get to have holes in your underlying view based on the transparency of your mask. On the other hand, clipShape() only adjusts the outside shape of the view you apply it to.

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