How to use Binding in function in Swift

Issue #675

Use wrappedValue to get the underlying value that Binding contains

extension View {
    func addOverlay(shows: Binding<Bool>) -> some View {
        HStack {
            self
            Spacer()
        }
        .overlay(
            HStack {
                Spacer()
                SmallButton(
                    imageName: "downArrow",
                    tooltip: shows.wrappedValue ? "Collapse" : "Expand",
                    action: {
                        shows.wrappedValue.toggle()
                    }
                )
                .rotationEffect(.radians(shows.wrappedValue ? .pi : 0))
            }
        )
    }
}