intro-to-flutter-21.dart

class CreateThreadScreen extends StatefulWidget {…}

class _CreateThreadScreenState extends State<CreateThreadScreen> {
  @override
  void afterInitState() {
    super.afterInitState();

    bloc.title
        .map((v) => _titleController.value.copyWith(text: v))
        .listen((v) => _titleController.value = v, onError: ignore)
        .addTo(_subscriptions);
  }
}