struct ScaleAnimateView: View {
    @State private var isAnimated = false
    var animation: Animation {
        Animation.linear
    }
    
    var body: some View {
        VStack(spacing: 20) {
            // 1
            Button("Rotate") {
                self.isAnimated.toggle()
            }
            // 2
            Rectangle()
                .foregroundColor(.green)
                .frame(width: 200, height: 200)
                .scaleEffect(isAnimated ? 0.5 : 1)
                .animation(animation)
        }
    }
}