notificationStream method
Implementation
Stream<NavigineNotification> notificationStream() {
_notificationController = StreamController();
_channel.invokeMethod('attachNotificationListener');
_notificationController!.onCancel = () async {
await _channel.invokeMethod('removeNotificationListener');
_notificationController?.close();
_notificationController = null;
};
return _notificationController!.stream;
}