Location permission check and authorization

I want my program to display the users location on the map. It was working at first then randomly stopped so i added the code below to try to fix it but I'm having problems. Thanks in advance!

    override func viewDidLoad()
    {
        super.viewDidLoad()
        self.locationManager.delegate = self
        self.locationManager.desiredAccuracy = kCLLocationAccuracyBest
        if CLLocationManager.locationServicesEnabled()
        {

            let status: CLAuthorizationStatus = CLLocationManager.authorizationStatus()
            if status == CLAuthorizationStatus.NotDetermined
            {
                locationManager.requestAlwaysAuthorization()
            }
            } else {

                print("locationServices disenabled")
            }
            locationManager.startUpdatingLocation()
            self.locationManager.startUpdatingLocation()
            self.mapView.showsUserLocation = true
            mapView.delegate = self
            centerMapOnLocation(initialLocation)
            addBoundry()
    }

You required to call,

locationManager.requestAlwaysAuthorization() 

as well

 locationManager.requestWhenInUseAuthorization()

to use location smoothly in foreground also!!!

and you should not need two instance to call startupdatinglocation. keep one. you should use instance or global variable instead of local to get location throughout the scope.

Update :

You have to set two keys in info.plist like, NSLocationAlwaysUsageDescription and NSLocationWhenInUseUsageDescription with it's usage description.