命名参数 initialData 是必需的，但没有相应的参数

Question

在 Flutter 提供程序中，我有这个代码，它曾经可以工作，但现在在 StreamProvider<User> 处给出了这个错误。

The named parameter initialData is required but there is no corresponding argument

User 模型没有 initialData 变量。我该如何解决这个问题？

List<SingleChildStatelessWidget> providers = [
  ...independentServices,
  ...dependentServices,
  ...uiConsumableProviders
];

List<SingleChildStatelessWidget> independentServices = [

  Provider(create: (_) => AppLanguage()),

  Provider(create: (_) => Api()),

];

List<SingleChildStatelessWidget> dependentServices = [

  ProxyProvider<Api, AuthenticationService>(

    update: (context, api, authenticationService) => AuthenticationService(api: api),
  
  ),
];

List<SingleChildStatelessWidget> uiConsumableProviders = [

  StreamProvider<User>(
  
    create: (context) => Provider.of<AuthenticationService>(context, listen: false).user,

    lazy: false
  
  ),

];

Answer 1

StreamProvider 有一个名为 initialData 的参数。如果你想进一步，你可以检查 https://pub.dev/documentation/provider/latest/provider/StreamProvider-class.html

因此，您应该像下面几行一样传递 initialData 命名参数；

List<SingleChildStatelessWidget> uiConsumableProviders = [

  StreamProvider<User>(
    initialData: User(), // this line added !
    create: (context) => Provider.of<AuthenticationService>(context, listen: false).user,
    lazy: false
  ),

];

命名参数 initialData 是必需的，但没有相应的参数

The named parameter initialData is required but there is no corresponding argument

flutter

flutter-provider