Как сохранить состояние виджета switch, используя shared preference, на flutter?

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import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';

class MySwitch extends StatefulWidget {
  @override
  _MySwitchState createState() => _MySwitchState();
}

class _MySwitchState extends State<MySwitch> {
  bool _switchValue = false;

  @override
  void initState() {
    super.initState();
    _loadSwitchValue();
  }

  @override
  Widget build(BuildContext context) {
    return Switch(
      value: _switchValue,
      onChanged: (value) {
        setState(() {
          _switchValue = value;
          _saveSwitchValue(value);
        });
      },
    );
  }

  _loadSwitchValue() async {
    SharedPreferences prefs = await SharedPreferences.getInstance();
    setState(() {
      _switchValue = prefs.getBool('switchValue') ?? false;
    });
  }

  _saveSwitchValue(bool value) async {
    SharedPreferences prefs = await SharedPreferences.getInstance();
    await prefs.setBool('switchValue', value);
  }
}