How to run workmanager every 15 minutes in the background in flutter IOS

user_14529649 0
Viewed 5174

I am working on adding a workmanager flutter to my project. Now it works perfectly on Android system as follows:

const fetchBackground = "fetchBackground";

void callbackDispatcher() {
  Workmanager.executeTask((task, inputData) async {
    switch (task) {
      case fetchBackground:
        Position userLocation = await Geolocator().getCurrentPosition(desiredAccuracy: LocationAccuracy.high);
        notif.Notification notification = new notif.Notification();
        notification.showNotificationWithoutSound(userLocation);
        break;
    }
    return Future.value(true);
  });
}



void main() => runApp(MyApp());

class MyApp extends StatelessWidget {

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(

        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}
class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {

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

    Workmanager.initialize(
      callbackDispatcher,
      isInDebugMode: true,
    );


    Workmanager.registerPeriodicTask(
      "1",
      fetchBackground,
      frequency: Duration(minutes: 15),
    );
  }

So now every 15 minutes, the application will run in the background in the following and send an alert to the user that's perfect. But with IOS I cannot use: registerPeriodicTask.

Workmanager.registerPeriodicTask(
      "1",
      fetchBackground,
      frequency: Duration(minutes: 15),
    );

In this case, the app works for me without using registerPeriodicTask, but I have to run Debug → Simulate Background Fetch manually in order to get the alert from XCode. So what is the solution to make the app run every 15 minutes in the background in iOS as well as Android

flutter
3 Answers

So instead of this you can use the ansyns timer that will be called after every 15 seconds if the app is running no matter what screen is currently opened.

So you can call it in the main.dart file

Timer timerObj;
    timerObj = Timer.periodic(Duration(seconds: 15), (timer) async {
          _initData();
         
          }
        });
    
    In order to cancel the timer you can call timerObj = null or timerObj.cancel();
user_134396170
user_101740370

You're right, you cannot use Workmanager.registerPeriodicTask with iOS. In fact, you shouldn't have to use anything at all. The documentation says:

iOS periodic task is automatically scheduled if you setup the plugin properly.

https://pub.dev/documentation/workmanager/latest/workmanager/Workmanager-class.html

So according to this you just have to make sure that the setup here is followed right: https://github.com/fluttercommunity/flutter_workmanager/blob/master/IOS_SETUP.md

and just initialize and register the callback.

user_162743540
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