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onetime onboarding flutter

Flutter Onboarding Screen only one time from onboarding to Login to Mainscreen







Future < void > main() async {

  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({
    Key ? key
  }): super(key: key);

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    SystemChrome.setSystemUIOverlayStyle(const SystemUiOverlayStyle(
      statusBarColor: Colors.transparent, // transparent status bar
      statusBarIconBrightness: Brightness.dark // dark text for status bar
    ));
    //get stored int from sharedpref
    Future < int > alreadyAUser = IsFirstTime().getOnce();

    return MultiProvider(
      providers: AppProviders.providers,
      child: MaterialApp(
        debugShowCheckedModeBanner: false,
        routes: AppRoutes.routes(),
        home: FutureBuilder(
          builder: (ctx, snapshot) {
            // Checking if future is resolved or not
            if (snapshot.connectionState == ConnectionState.done) {
              // If data is present
              if (snapshot.hasData) {
                final data = snapshot.data as int;
                print(data);
                switch (data) {
                  case 0:
                    return OnboardingScreen();

                  case 1:
                    return LoginScreen();

                  case 2:
                    return MainScreen();
                }

                // if we got our data
              }
            }

            // Displaying blank to indicate waiting state
            return Container(
              color: Colors.white,
            );
          },

          // Future that needs to be resolved
          // inorder to display something on the Canvas
          future: alreadyAUser,
        ),
      ),
    );
  }
}

class IsFirstTime {
  Future < int > getOnce() async {
    int ? intValue;
    SharedPreferences prefs = await SharedPreferences.getInstance();
    //Return String

    if (prefs.getInt("initScreen") == null) {
      intValue = 0;
    } else {
      intValue = prefs.getInt("initScreen");
    }

    return intValue!;
  }

  Future once(int num) async {
    SharedPreferences prefs = await SharedPreferences.getInstance();
    //initScreen
    await prefs.setInt("initScreen", num);

    int initScreen = (prefs.getInt("initScreen")) !;
    print('initScreen ${initScreen}');
    // return initScreen;
  }
}



class OnboardingScreen extends StatefulWidget {
  OnboardingScreen({
    Key ? key
  }): super(key: key);

  @override
  State < OnboardingScreen > createState() => _onboardingScreenState();
}

class _onboardingScreenState extends State < OnboardingScreen > {
  @override
  Widget build(BuildContext context) {
    return Container(
      child: Center(
        child: GestureDetector(
          onTap: () {
            IsFirstTime().once(1);

            //navigate
          },
          child: Text('Login screen something')),
      ));
  }
}
class login extends StatefulWidget {
  login({
    Key ? key
  }): super(key: key);

  @override
  State < login > createState() => _loginState();
}

class _loginState extends State < login > {
  @override
  Widget build(BuildContext context) {
    return Container(
      child: Center(
        child: GestureDetector(
          onTap: () {
            IsFirstTime().once(2);
            //navigate to mainscreen
          },
          child: Text('Login screen something')),
      ));
  }
}