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.

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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