struct ContentView: View {
   @State private var title: String = "Valid"
   @State private var isValid: Bool = true

   var body: some View {
      VStack {
         Text(title)
            .padding(10)
         Button(action: {
            isValid.toggle()
            title = isValid ? "Valid" : "Invalid"
         }, label: { Text("Change Validation") })
         Spacer()
      }.padding()
   }
}