PressedButtonStyle.swift

struct PressedButtonStyle: ButtonStyle {
    @Binding var isPressed: Bool

    func makeBody(configuration: Configuration) -> some View {
        var animation: Animation?

        /// only change when it's different
        if isPressed != configuration.isPressed {
            if configuration.isPressed {
                animation = .spring(
                    response: 0.1,
                    dampingFraction: 0.6,
                    blendDuration: 1
                )
            } else {
                animation = .spring(
                    response: 0.4,
                    dampingFraction: 0.4,
                    blendDuration: 1
                )
            }

            DispatchQueue.main.async {
                withAnimation(animation) {
                    isPressed = configuration.isPressed
                }
            }
        }

        return configuration.label
            .opacity(1) /// needs a modifier to actually be called
    }
}