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struct Watermark: ViewModifier {
    var text: String

    func body(content: Content) -> some View {
        ZStack(alignment: .bottomTrailing) {
            content
            Text(text)
                .font(.caption)
                .foregroundColor(.white)
                .padding(5)
                .background(Color.black)
        }
    }
}

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extension View {
    func watermarked(with text: String) -> some View {
        self.modifier(Watermark(text: text))
    }
}

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Color.green
    .frame(width: 300, height: 200)
    .watermarked(with: "Hacking with Swift")