Background Location Tracking iOS

Question

I need some help in tracking user location in background, suspended and killed state.

Problem Statement

I want to track user location after his consent in my App. I want to track user location in all the states Background, Suspended and Foreground. Till user has stopped it from the app. I am not able to track location in background and killed state but foreground is working fine.

I have also enabled below settings in my locationManager

locationManager.allowsBackgroundLocationUpdates = true
locationManager.pausesLocationUpdatesAutomatically = false
locationManager.showsBackgroundLocationIndicator = true


locationManager.startMonitoringSignificantLocationChanges()

What I have tried till now is

• Enabled background modes
• Location updates (checked)
• Background fetch (checked)
• Background processing (checked)
• Permission to Allow Always location access

Created a singleton for location tracking check the below code and calling this class on didFinishLaunchingWithOptions - AppDelegate

   class EmployeeAttendanceTracker: NSObject,CLLocationManagerDelegate {


   static let shared = EmployeeAttendanceTracker()

private let locationManager = CLLocationManager()
private var lastLocationDate = Date()
static let LOCATION_INTERVAL = 1

var locationUpdate: (() -> Void)?

private override init() {
    super.init()
    setupLocationManager()
}

private func setupLocationManager() {
    locationManager.delegate = self
    locationManager.desiredAccuracy = kCLLocationAccuracyBest
    locationManager.activityType = .other
    locationManager.distanceFilter = kCLDistanceFilterNone
    locationManager.allowsBackgroundLocationUpdates = true
    locationManager.pausesLocationUpdatesAutomatically = false
    locationManager.showsBackgroundLocationIndicator = true
    
    
    if #available(iOS 9.0, *) {
      locationManager.requestAlwaysAuthorization()
    } else {
      locationManager.requestWhenInUseAuthorization()
    }
}
  //    
//
//    // MARK: - CLLocationManagerDelegate
//    
    func locationManager(_ manager: CLLocationManager, didChangeAuthorization      status: CLAuthorizationStatus) {
        switch status {
        case .restricted:
            //showLocationPermissionAlert()
            Logger.s("Location access restricted.")
        case .denied:
            //showLocationPermissionAlert()
            Logger.s("User denied location access.")
        case .notDetermined:
           // showLocationPermissionAlert()
            Logger.s("Location access not determined.")
        case .authorizedAlways:
            if #available(iOS 9, *) {
                locationManager.requestLocation()
            } else {
                locationManager.startUpdatingLocation()
                locationManager.startMonitoringSignificantLocationChanges()
            }
        default:
           // showLocationPermissionAlert()
            break
        }
    }


func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
guard let location = locations.last else { return }

Logger.s("User latitude: \(location.coordinate.latitude), longitude: \(location.coordinate.longitude)")
locationManager.stopUpdatingLocation()

let now = Date()
if isItTime(now: now as NSDate) {
    if shouldSendLocationToServer() {
        self.sendLocationToServer(location: location,completion: {
            self.locationUpdate?()
        })
    }else{
        self.locationUpdate?()
    }
    Logger.s(now)
    Logger.s(location)
}else{
    self.locationUpdate?()
}

  }

Any help on this would be greatly appreciated