我在flutter中使用injectable和get_it包
我有一个共同的偏好类别:
@LazySingleton()
class SharedPref {
final String _token = 'token';
SharedPreferences _pref;
SharedPref(this._pref);
Future<String> getToken() async {
return _pref.getString(_token) ?? '';
}
Future<void> setToken(String token) async {
await _pref.setString(_token, token);
}
}
这个类注入为惰性单例我有一个用于注入共享首选项的模块:
@module
abstract class InjectableModule {
@lazySingleton
Future<SharedPreferences> get prefs => SharedPreferences.getInstance();
}
在 bloc 类中,我使用 SharedPref 类:
@injectable
class LoginCheckBloc extends Bloc<LoginCheckEvent, LoginCheckState> {
final SharedPref sharedPref;
LoginCheckBloc({@required this.sharedPref}) : super(const LoginCheckState.initial());
@override
Stream<LoginCheckState> mapEventToState(
LoginCheckEvent event,
) async* {
if (event is CheckLogin) {
final String token = await sharedPref.getToken();
if (token.isEmpty){
yield const LoginCheckState.notLogin();
}else{
yield const LoginCheckState.successLogin();
}
}
}
}
当我将 LoginCheck Bloc 与 getIt 一起使用时,我在注入共享首选项时出现错误:
BlocProvider<LoginCheckBloc>(
create: (BuildContext context) => getIt<LoginCheckBloc>()..add(CheckLogin()),
),
错误消息是:
You tried to access an instance of SharedPreferences that was not ready yet
'package:get_it/get_it_impl.dart':
Failed assertion: line 272 pos 14: 'instanceFactory.isReady'
如何将共享首选项与可注入一起使用?