我按照示例项目中所示设置了所有内容：

import 'package:get_it/get_it.dart';
import 'package:places/services/authService.dart';

final locator = GetIt.instance;

void setupLocator() {
  locator.registerSingleton<AuthService>(AuthService());
  print("registered");
}

字符串
在主文件中调用

void main() {
  setupLocator();
  runApp(MyApp());
}

型
我有一些检查定位器也正确返回我的AuthService

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

  @override
  _AuthGuardViewState createState() => _AuthGuardViewState();
}

class _AuthGuardViewState extends State<AuthGuardView> {
  @override
  Widget build(BuildContext context) {
    return ViewModelProvider<AuthGuardViewModel>.withConsumer(
      viewModel: AuthGuardViewModel(),
      onModelReady: (model) => model.initialise(),
      builder: (context, model, child) => model.isLoggedIn
          ? Container(
              color: Colors.white,
              child: Text("Logged In"),
            )
          : SignUpView(),
    );
  }
}

class AuthGuardViewModel extends ChangeNotifier {
  AuthService _authService = locator<AuthService>();
  bool isLoggedIn = false;

  void initialise() async {
    isLoggedIn = await _authService.isLoggedIn();
    notifyListeners();
  }
}

型
如果我在SignUpView的ViewModel中做同样的事情，我会得到以下错误

flutter: The following assertion was thrown building SignUpView(dirty, state: _SignUpViewState#01129):
flutter: No type AuthService is registered inside GetIt.
flutter:  Did you forget to pass an instance name?
flutter: (Did you accidentally do  GetIt sl=GetIt.instance(); instead of GetIt sl=GetIt.instance;did you
flutter: forget to register it?)
flutter: 'package:get_it/get_it_impl.dart':
flutter: Failed assertion: line 248 pos 14: 'instanceFactory != null'

型
在AuthGuard的ViewModel中，我成功地检索到了auth服务。我还注解掉了定位器代码（因为我认为它可能是auth c调用或类似的东西），但同样的错误仍然存在。
我正在使用get_it：^4.0.1，但降级到3.x.x时错误仍然存在

的数据
在这里，SignUpViewModel

class SignUpViewModel extends ChangeNotifier {
  SignUpViewModel(){
    if(locator.isRegistered<AuthService>()) {
      AuthService _authService = locator<AuthService>();
    } 
  }
  var textInputFormatter = [
    WhitelistingTextInputFormatter(RegExp(r'\d')),
    PhoneNumberTextInputFormatter()
  ];
  var textEditingController;
  var context;
}

型