Flutter GetIt插件-GetIt内部未注册任何类型的xxx [英] Flutter GetIt Plugin - No type xxx is registered inside GetIt

问题描述

我按照示例项目所示进行了所有设置:

I set everything up as shown in the example project:

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");
}

呼叫已保存在主文件中

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

我有一些检查，定位器在哪里也可以正确返回我的AuthService

I have some Check where the locator also correctly return my 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();
  }
}

如果在SignUpView的ViewModel中执行完全相同的操作，则会出现以下错误

If I do the exact same thing inside the ViewModel for the SignUpView I get the following error

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'

在AuthGuard的ViewModel中，我确实成功检索了auth服务.我也注释掉了定位器代码(因为我认为这可能是异步调用或类似的东西)，但是相同的错误仍然存​​在.

In the ViewModel for the AuthGuard I do successfully retrieve the auth service. I also commented out the locator code (because I thought it might be the async call or something like that) but the same error persists.

我正在使用get_it:^ 4.0.1，但是降级到3.x.x时错误仍然存​​在

I am using get_it: ^4.0.1 but the error persists when downgrading to 3.x.x

这是SignUpViewModel

Here the 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;
}

推荐答案

使用 pubspec.yaml 中的最新 get_it 版本(现在是 get_it:^4.0.2 )为我解决此问题.您可以在这篇中等文章中查看更多信息.

Using the latest get_it version in pubspec.yaml ( now it is get_it: ^4.0.2 ) resolve the issue for me. You can have a look at this medium article for more info.

查看全文