Location tracking stops after a while when app is in the background

Question

I've created a simple app which tracks user location and creates local notification for every time location is updated.

I enabled the background modes below,

let locationManager = CLLocationManager()

open override func viewDidLoad() {
       locationManager.delegate = self;
       locationManager.desiredAccuracy = kCLLocationAccuracyBest;
       locationManager.distanceFilter = 10
       locationManager.allowsBackgroundLocationUpdates = true
       locationManager.startUpdatingLocation()
}

open func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
       let notification = UILocalNotification()
       notification.alertBody = "location updated"
       notification.fireDate = Date()
       UIApplication.shared.scheduleLocalNotification(notification)
}

I set string for NSLocationAlwaysUsageDescription and ask for permission. User grant permission for always usage when the app loaded first time.

---

It's working well when app is in the foreground, when it goes background still working at least in 5-40 minutes time range which is changeable by battery or other opened apps.

The problem is why it stops working, Isn't it expected to be keep working?

I've never seen a time limit in Apple docs.

Answer 1

Switch to significant location updates when the app moves to background. iOS will unload the app if it keep alive in the background indefinitely.

locationManager.pausesLocationUpdatesAutomatically = false