How to save state in flutter bloc?

Question

Dart

Hello, I started to study BLoC pattern ( flutter_bloc plugin ) and I can't figure out how to save the selected state.
I started making applications, namely the weather forecast. Specifically, in my example, initialState will be one city.
After the user selects another city, it is necessary that when the application is opened (after closing), the selected city is shown on the screen. How can I achieve this with the Bloc pattern.

My Code:

WeatherBloc

class WeatherBloc extends Bloc<WeatherEvent, WeatherState> {
  final WeatherRepository weatherRepository;
  WeatherBloc({this.weatherRepository}) : super(Weatherinitial());

  @override
  Stream<WeatherState> mapEventToState(
    WeatherEvent event,
  ) async* {
    if (event is FetchWeather) {
      yield WeatherLoading();
      try {
        WeatherModel weatherModel =
            await weatherRepository.getWeather(event.latlan);
        yield WeatherLoaded(weatherModel: weatherModel);
      } catch (_) {
        yield WeatherError();
      }
    }
  }
}

ui:

@override
  Widget build(BuildContext context) {
    return BlocProvider<WeatherBloc>(
        create: (context) =>
            WeatherBloc(weatherRepository: WeatherRepository()),
        child: Scaffold(
            backgroundColor: HexColor('ffffff'),
            body: BlocBuilder<WeatherBloc, WeatherState>(
              builder: (context, state) {
                if (state is Weatherinitial) {
                  return WeatherUI();
                }
                if (state is WeatherLoading) {
                  return Center(
                    child: CircularProgressIndicator(),
                  );
                }
                if (state is WeatherLoaded) {
                  return Center(
                    child: Column(
                      children: [
                        Container(
                          child: Text(state.weatherModel.temp.toString()),
                        ),
                        Container(
                          child: Text(state.weatherModel.isDay.toString()),
                        )
                      ],
                    ),
                  );
                }
                return Text('Error');
              },
            )));
  }
}

Answer 1

Save somewhere (for example, in shared preferences) the selected city.