flutter notification is not coming in ios when app is on kill state but when we open the app notification is coming

Question

Hello i have an issue in flutter IOS notification , when app is on background or kill state notification is showing only when we click to open the app otherWise notification is not showing in IOS device !

Answer 1

Please try this

class name FCM

import 'dart:async';
    
    import 'package:firebase_core/firebase_core.dart';
    import 'package:firebase_messaging/firebase_messaging.dart';
    
    Future<void> onBackgroundMessage(RemoteMessage message) async {
      await Firebase.initializeApp();
    
      if (message.data.containsKey('data')) {
        // Handle data message
        final data = message.data['data'];
      }
    
      if (message.data.containsKey('notification')) {
        // Handle notification message
        final notification = message.data['notification'];
      }
      // Or do other work.
    }
    
    class FCM {
      final _firebaseMessaging = FirebaseMessaging.instance;
    
      final streamCtlr = StreamController<String>.broadcast();
      final titleCtlr = StreamController<String>.broadcast();
      final bodyCtlr = StreamController<String>.broadcast();
    
      setNotifications() {
        FirebaseMessaging.onBackgroundMessage(onBackgroundMessage);
        FirebaseMessaging.onMessage.listen(
              (message) async {
            if (message.data.containsKey('data')) {
              // Handle data message
              streamCtlr.sink.add(message.data['data']);
            }
            if (message.data.containsKey('notification')) {
              // Handle notification message
              streamCtlr.sink.add(message.data['notification']);
            }
            // Or do other work.
            titleCtlr.sink.add(message.notification!.title!);
            bodyCtlr.sink.add(message.notification!.body!);
          },
        );
        // With this token you can test it easily on your phone
        final token =
        _firebaseMessaging.getToken().then((value) => print('Token: $value'));
      }
    
      dispose() {
        streamCtlr.close();
        bodyCtlr.close();
        titleCtlr.close();
      }
    }

And Main Class

    void main() async {
      await init();
      runApp(const MyApp1());
    }
    
    Future init() async {
      WidgetsFlutterBinding.ensureInitialized();
      await Firebase.initializeApp();
    }
    
    class MyApp extends StatelessWidget {
      const MyApp({Key? key}) : super(key: key);
    
      @override
      Widget build(BuildContext context) {
        return const MaterialApp(
          home: HomePage(),
        );
      }
    }
    
    class HomePage extends StatefulWidget {
      const HomePage({Key? key}) : super(key: key);
    
      @override
      State<HomePage> createState() => _HomePageState();
    }
    
    class _HomePageState extends State<HomePage> {
      String notificationTitle = 'No Title';
      String notificationBody = 'No Body';
      String notificationData = 'No Data';
    
      @override
      void initState() {
        final firebaseMessaging = FCM();
        firebaseMessaging.setNotifications();
    
        firebaseMessaging.streamCtlr.stream.listen(_changeData);
        firebaseMessaging.bodyCtlr.stream.listen(_changeBody);
        firebaseMessaging.titleCtlr.stream.listen(_changeTitle);
    
        super.initState();
      }
    
      _changeData(String msg) => setState(() => notificationData = msg);
      _changeBody(String msg) => setState(() => notificationBody = msg);
      _changeTitle(String msg) => setState(() => notificationTitle = msg);
    
      @override
      Widget build(BuildContext context) {
        return Scaffold(
          body: Center(
            child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                Text(
                  notificationTitle,
                  style: Theme.of(context).textTheme.headline4,
                ),
                Text(
                  notificationBody,
                  style: Theme.of(context).textTheme.headline6,
                ),
                Text(
                  notificationData,
                  style: Theme.of(context).textTheme.headline6,
                ),
              ],
            ),
          ),
        );
      }
    }