Android 如何在具有BottomNavigationBar的类的initState中使用Settings类的方法？

我想在另一个类的initState中使用getSelectedPref（）方法

getSelectedPref() async {
SharedPreferences pref = await SharedPreferences.getInstance();
setState(() {
  language = pref.getString('language');
  _darkMode = pref.getBool('darkMode');
  _sound = pref.getBool('sound');
});}

另一类是NavMenu

class _NavMenuState extends State<NavMenu> {
@override
Widget build(BuildContext context) {
return Scaffold(
  body: SafeArea(
    child: allPages[secilenMenuItem],
  ),
  bottomNavigationBar: bottomNavMenu(),
);}}

void initState() {
super.initState();
pageMain = MainPage(keyMainPage);
pageSettings = Settings(keySettings);
pageAllWords = AllWords(keyAllWords);
pageLeague = League(keyLeague);
pageProfile = Profile(keyProfile);
allPages = [pageSettings, pageAllWords, pageMain, pageLeague, pageProfile];}