Version: 9.3.2

Working with arguments

Sometimes you need to pass initial values to your StateNotifier. In such cases, you can use the StateNotifierArgumentsProvider class and call the setArguments function to set argument values that will be retrieved in the creator callback of your provider.

If setArguments is missing, Meedu now throws a clearer error that includes the provider label when available.

Next, you can use the ref parameter of your callback generator to access the arguments passed in the initState method.

final loginProvider = Provider.stateArguments<LoginNotifier, LoginState, String>(
  (ref) => LoginNotifier(
    LoginState(
      email: ref.arguments, // here ref.arguments is a String
      password: '',
    ),
  ),
);


class LoginPage extends StatefulWidget {
  const LoginPage({Key? key}) : super(key: key);

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

class _LoginPageState extends State<LoginPage> {
  @override
  void initState() {
    super.initState();
    // you must set your arguments
    // before call loginProvider.read or before use watch(loginProvider)
    loginProvider.setArguments("initial@email.com");
  }

  @override
  Widget build(BuildContext context) {
    // YOUR CODE HERE
  }
}