TouchEventButtonScale.swift

Text("Press to accelerate!")
    .foregroundColor(Color.white)
    .padding(10)
    .background(Color.gray)
    .cornerRadius(6)
    .padding(10)
    .modifier(TouchDownUpEventModifier(changeState: { (buttonState) in
        if buttonState == .pressed {
            buttonPressed = true
        } else {
            buttonPressed = false
        }
    }))
    /// ↓ add this ↓
    .scaleEffect(buttonPressed ? 0.9 : 1).animation(.easeOut(duration: 0.2))