在最新的 bloc 包中使用 stream.listen 是什么意思

What does it mean to use stream.listen in latest bloc package

我正在使用 bloc: ^7.0.0,它是当前最新的 bloc 包,它现在表示 listen 方法现已弃用。相反,我应该使用 stream.listen。但我不明白如何使用 stream.listen。请帮忙解释一下。谢谢!

下面是我的代码:

    signInBloc.l̶i̶s̶t̶e̶n̶((state) {
      if (state is CheckIfSignedInEventCompletedState) {
        if (state.isSignedIn) {
          print('logged in');
        } else {
          print('not logged in');
        }
      }
class SignInBloc extends Bloc<SignInEvent, SignInState> {
  @override
  Stream<SignInState> mapEventToState(
    SignInEvent event,
  ) async* {
    if (event is CheckIfSignedInEvent) {
      yield* mapCheckIfSignedInEventToState();
    }
  }
  Stream<SignInState> mapCheckIfSignedInEventToState() async* {
    try {
      bool isSignedIn = await authenticationRepository.checkIfSignedIn();
      if (isSignedIn != null) {
        if (isSignedIn) {
          yield CheckIfSignedInEventCompletedState(true);
        } else {
          yield CheckIfSignedInEventCompletedState(false);
        }
      } else {
        yield CheckIfSignedInEventFailedState();
      }
    } catch (e) {
      print(e);
      yield CheckIfSignedInEventFailedState();
    }
  }
}
signInBloc.l̶i̶s̶t̶e̶n̶((state) {

简单地变成:

signInBloc.stream.listen((state) {

在此处查看从 6.1.x 到 7.0.0 的 bloc 迁移指南:https://bloclibrary.dev/#/migration?id=packagebloc