flutter 通知不会出现在 ios 当应用程序正在杀死 state 但当我们打开应用程序时通知即将到来

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,
                ),
              ],
            ),
          ),
        );
      }
    }