[英]Flutter dependency injenction with shared preferences
Good evening, I'm trying to use dependency injection with the shared preferences plugin, but as soon is I generate the code, I get an error for an unrelated Bloc.晚上好,我正在尝试将依赖注入与共享首选项插件一起使用,但是一旦我生成代码,我就会收到一个不相关 Bloc 的错误。 I use
我用
My Goal is to inject SharedPreferences into a class for handling local operations, it looks like that:我的目标是将 SharedPreferences 注入 class 以处理本地操作,它看起来像这样:
class LocalSharedPreferences {
final SharedPreferences _preferences;
LocalSharedPreferences(this._preferences);
...
}
In order to inject SharedPreferences properly, I followed its official documentation ( https://pub.dev/packages/injectable#registering-asynchronous-injectables ), thus my code to inject a 3rd-party module looks like this:为了正确注入 SharedPreferences,我遵循了它的官方文档( https://pub.dev/packages/injectable#registering-asynchronous-injectables ),因此我注入第 3 方模块的代码如下所示:
@module
abstract class RegisterModule {
@preResolve
Future<SharedPreferences> get prefs => SharedPreferences.getInstance();
}
I followed this question on StackOverflow but it did not work.我在 StackOverflow 上关注了这个问题,但它没有用。 My error is as follows:
我的错误如下:
The following assertion was thrown building SignInForm(dependencies: [MediaQuery]):
Object/factory with type SignInFormBloc is not registered inside GetIt.
(Did you accidentally do GetIt sl=GetIt.instance(); instead of GetIt sl=GetIt.instance;
Did you forget to register it?)
'package:get_it/get_it_impl.dart':
Failed assertion: line 298 pos 9: 'instanceFactory != null'
The auto-generated-injection code looks like follows:自动生成的注入代码如下所示:
Future<GetIt> $initGetIt(
GetIt get, {
String environment,
EnvironmentFilter environmentFilter,
}) async {
final gh = GetItHelper(get, environment, environmentFilter);
final registerModule = _$RegisterModule();
gh.factory<DatosBauServerApiHelper>(() => DatosBauServerApiHelper());
gh.factory<DatosBauServerAuth>(
() => DatosBauServerAuth(get<DatosBauServerApiHelper>()));
gh.lazySingleton<IAuthFacade>(
() => DatosBauServerAuthFacade(get<DatosBauServerAuth>()));
final sharedPreferences = await registerModule.prefs;
gh.factory<SharedPreferences>(() => sharedPreferences);
gh.factory<SignInFormBloc>(() => SignInFormBloc(get<IAuthFacade>()));
return get;
}
class _$RegisterModule extends RegisterModule {}
LocalSharedPreferences class LocalSharedPreferences class
abstract class LocalSharedPreferences {
// ...
}
LocalSharedPreferencesImpl class LocalSharedPreferencesImpl class
class LocalSharedPreferencesImpl extends LocalSharedPreferences {
// ...
// Use your globalSharedPrefs variable here
}
Another dart file另一个dart文件
GetIt locator = GetIt.instance;
setupServicesLocator() {
locator.registerLazySingleton<LocalSharedPreferences>(() => LocalSharedPreferencesImpl());
}
Your main.dart file您的 main.dart 文件
SharedPreferences globalSharedPrefs;
void main() async {
/* ENSURE ASYNC WILL NOT GENERATE RUNTIME ERROR */
WidgetsFlutterBinding.ensureInitialized();
/* GLOBAL SERVICES */
setupServicesLocator();
/* Initialize your globalSharedPreferences variable here */
globalSharedPrefs = await SharedPreferences.getInstance();
}
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