Blocを使いながらiOSからヘルスケア情報を取得してみた

class HealthBloc extends Bloc<HealthEvent, HealthState> {
  MyHealth health = MyHealth();
  HealthBloc() : super(HealthLoading()){
    on<HealthStart>(_onStart);
    on<FilterAndFetchData>(_onFilterAndFetchData);
    on<OrderAndFetchData>(_onOrderAndFetchData);
  }
  void _onStart(HealthStart event, Emitter<HealthState> emit) async {
    bool authorized = await health.authorize();
    if (authorized) {
      await health.fetchHealthData(null, null);
      emit(HealthState(healthData: health));
    } else {
      emit(HealthError("認証に失敗しました"));
    }
  }
}

abstract class HealthEvent {}

class HealthStart extends HealthEvent {}

class HealthState{
  final MyHealth? healthData;
  HealthState({this.healthData});
}
class HealthError extends HealthState{
  final String message;
  HealthError(this.message);
}

class HealthPage extends StatelessWidget{
  const HealthPage({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return BlocProvider(
      create: (context) => HealthBloc()..add(HealthStart()),
      child:BlocBuilder<HealthBloc,HealthState>(
        builder: (context,state){
          if( state is HealthLoading){
            return const Scaffold(
              body: Center(
                child:CircularProgressIndicator()
              )
            );
          }else if(state is HealthError){
            return Scaffold(
              body: Center(
                child: Text(state.message),
              ),
            );
          }else{
            return Scaffold(
            body: Center(
             {/**　TODO Widgetを表示させる */}