ios_location_updates

Select the Info.plist file.
Click on the + button to add a key.
Add the key named NSLocationAlwaysUsageDescription.
Write a convincing description of why you need location in the background.

class MovieDetailViewController: UIViewController, CLLocationManagerDelegate {
@IBOutlet weak var mapView: MKMapView!
    
    var locations = [MKPointAnnotation]()
    lazy var locationManager: CLLocationManager! = {
        let manager = CLLocationManager()
        manager.desiredAccuracy = kCLLocationAccuracyBest
        manager.delegate = self
        manager.requestAlwaysAuthorization()
        manager.allowsBackgroundLocationUpdates = true
        return manager
    }()
    
      
    @IBAction func enabledChanged(sender: UISwitch) {
        if sender.on {
            locationManager.startUpdatingLocation()
        } else {
            locationManager.stopUpdatingLocation()
        }
    }
    
    func locationManager(manager: CLLocationManager, didUpdateToLocation newLocation: CLLocation, fromLocation oldLocation: CLLocation) {
            // Add another annotation to the map.
            let annotation = MKPointAnnotation()
            annotation.coordinate = newLocation.coordinate
            
            // Also add to our map so we can remove old values later
            locations.append(annotation)
            
            // Remove values if the array is too big
            while locations.count > 100 {
                let annotationToRemove = locations.first!
                locations.removeAtIndex(0)
                
                // Also remove from the map
                mapView.removeAnnotation(annotationToRemove)
            }
            
            if UIApplication.sharedApplication().applicationState == .Active {
                mapView.showAnnotations(locations, animated: true)
                print("Showing annotations!")
            } else {
                NSLog("App is backgrounded. New location is %@", newLocation)
            }
        
    }
}