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When should you use ContainerRelativeShape?

Paul Hudson    @twostraws   

Updated for Xcode 12.5

New in iOS 14

SwiftUI has a number of built-in shapes that are self-explanatory, but there’s one that stands out: ContainerRelativeShape. This isn’t a fixed shape, but is instead designed to be an insettable version of whatever shape it’s placed inside, which is particularly important when creating home screen widgets.

Important: At this time, ContainerRelativeShape works only inside widgets. You can use it elsewhere, but it will just make a rectangle.

For example, we could write code that draws a blue shape in our widget, and use ContainerRelativeShape to make sure it’s the same shape as the widget itself:

struct ContentView: View {    
    var body: some View {
        ZStack {
            ContainerRelativeShape()
                .inset(by: 4)
                .fill(Color.blue)

            Text("Hello, World!")
                .font(.title)
        }
        .frame(width: 300, height: 200)
        .background(Color.red)
        .clipShape(Capsule())
    }
}

SwiftUI is smart here: as you inset the container shape further and further, it will scale the corner radius of the container so it looks great in your widget.

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