struct ContentView: View {

    @ObservedObject private var counterVM: CounterViewModel = CounterViewModel()

    var body: some View {
        VStack {
            Text("\(self.counterVM.counter)")

            HStack {
                Button("Increment") {
                    self.counterVM.increment()
                }
                Button("Decrement") {
                    self.counterVM.decrement()
                }
            }
        }
    }
}