FCM & Local notifications. Android works, on iOS not

Question

Im using a solution with FCM and Local notifications to receive specific push notifications on a channel. Everything works for Android.

I send my push notifications trough Postman to https://fcm.googleapis.com/fcm/send and that all works pretty well.

However when I add my iPhone, and finished all the installation steps that were needed. The only thing I receive is the print in my console on flutter with the message. I don't receive any kind of notification on the iPhone itself.

  final FirebaseMessaging _fcm = FirebaseMessaging();

  FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin =
      FlutterLocalNotificationsPlugin();

  var initializationSettingsAndroid;
  var initializationSettingsIOS;
  var initializationSettings;

  void _showNotification() async {
    //await _buildNotification();
  }

  Future<dynamic> myBackgroundMessageHandler(Map<String, dynamic> message) {
    if (message.containsKey('data')) {
      // Handle data message
      final dynamic data = message['data'];
    }

    if (message.containsKey('notification')) {
      // Handle notification message

      final dynamic notification = message['notification'];
    }

    // Or do other work.
  }

  Future<void> _createNotificationChannel(
      String id, String name, String description) async {
    final flutterLocalNotificationsPlugin = FlutterLocalNotificationsPlugin();
    var androidNotificationChannel = AndroidNotificationChannel(
      id,
      name,
      description,
      importance: Importance.Max,
      playSound: true,
      sound: RawResourceAndroidNotificationSound('not_kiddin'),
      enableVibration: true,
    );
    await flutterLocalNotificationsPlugin
        .resolvePlatformSpecificImplementation<
            AndroidFlutterLocalNotificationsPlugin>()
        ?.createNotificationChannel(androidNotificationChannel);
  }

  Future<void> _buildNotification(String title, String body) async {
    var androidPlatformChannelSpecifics = AndroidNotificationDetails(
        'my_channel',
        'Channel Name',
        'Channel Description.',
        importance: Importance.Max,
        priority: Priority.High,
        playSound: true,
        enableVibration: true,
        sound: RawResourceAndroidNotificationSound('not_kiddin'),
        ticker: 'noorderlicht');
    var iOSChannelSpecifics = IOSNotificationDetails();
    var platformChannelSpecifics = NotificationDetails(
        androidPlatformChannelSpecifics, iOSChannelSpecifics);

    await flutterLocalNotificationsPlugin.show(
        0, title, body, platformChannelSpecifics,
        payload: 'payload');
  }

  @override
  void initState() {
    super.initState();

    initializationSettingsAndroid =
        AndroidInitializationSettings('ic_launcher');
    initializationSettingsIOS = IOSInitializationSettings(
        onDidReceiveLocalNotification: onDidReceiveLocalNotification);

    initializationSettings = InitializationSettings(
        initializationSettingsAndroid, initializationSettingsIOS);

    _fcm.requestNotificationPermissions();

    _fcm.configure(
      onMessage: (Map<String, dynamic> message) async {
        print(message);
        flutterLocalNotificationsPlugin.initialize(initializationSettings,
            onSelectNotification: onSelectNotification);

        //_showNotification();
        Map.from(message).map((key, value) {
          print(key);
          print(value);
          print(value['title']);
          _buildNotification(value['title'], value['body']);
        });
      },
      onLaunch: (Map<String, dynamic> message) async {
print("onLaunch: $message");
      },
      onResume: (Map<String, dynamic> message) async {
print("onResume: $message");
      },
    );
  }

  Future onDidReceiveLocalNotification(
      int id, String title, String body, String payload) async {
    // display a dialog with the notification details, tap ok to go to another page
    showDialog(
      context: context,
      builder: (BuildContext context) => CupertinoAlertDialog(
        title: Text(title),
        content: Text(body),
        actions: [
          CupertinoDialogAction(
            isDefaultAction: true,
            child: Text('Ok'),
            onPressed: () {},
          )
        ],
      ),
    );
  }

  Future onSelectNotification(String payload) async {
    if (payload != null) {
      debugPrint('Notification payload: $payload');
    }
  }

Answer 1

_fcm.requestNotificationPermissions();

You need to request for permission in iOS (android dont need).

  _fcm.requestNotificationPermissions(
      const IosNotificationSettings(
          sound: true, badge: true, alert: true, provisional: true));

Answer 2

FCM messages come in different structures for IOS, in your case remove the 'data' when the platform is IOS like these below.

            if(Platform.isAndroid){
              roomId = message['data']['chatRoomId'];
              senderId = message['data']['senderId'];
            }else if(Platform.isIOS){
              roomId = message['chatRoomId'];
              senderId = message['senderId'];
            }