Widget build(BuildContext context) {
  final Bloc bloc = Provider.of(context);

  return Padding(
    padding: const EdgeInsets.symmetric(horizontal: 16.0),
    child: ListView(
      children: <Widget>[
        SizedBox(
          height: 32,
        ),
        _buildEmailField(bloc),
        SizedBox(
          height: 16,
        ),
        _buildPasswordField(bloc),
        SizedBox(
          height: 25,
        ),
        _buildSubmitButton(),
      ],
    ),
  );
}

void main() {
  runApp(LogIn());
}

class MyApp extends StatelessWidget {
  @override
    Widget build(BuildContext context) {
      return Provider(
        child: MaterialApp(
          home: Scaffold(
            body: LogIn(),
          ),
        ),
      );
    }
}

class Provider extends InheritedWidget {
  final Bloc bloc;

  Provider({Key key, Widget child})
      : bloc = Bloc(),
        super(key: key, child: child);

  @override
  bool updateShouldNotify(_) => true;

  static Bloc of(BuildContext context) {
    return (context.inheritFromWidgetOfExactType(Provider) as Provider).bloc;
  }
}

flutter: The following NoSuchMethodError was thrown building LogIn(dirty, state: _LogInState#1c0be):
flutter: The getter 'bloc' was called on null.
flutter: Receiver: null
flutter: Tried calling: bloc