Cool, this example code save my day and my app works in the way I have thought thanks to this examples the lead me to the right way!

My solution looks like this @State var counter = 0 @State var buttonTitle = "Klick mich!" var body: some View { VStack { // other controls Button(buttonTitle) { counter += 1 buttonTitle = "\(counter) mal\(counter > 1 ? "e":"") geklickt" } }

Works "as designed" in macOS app! Thanks for the tip/hint. :-)