ApplicationdidEnterBackground swift - ios

Question

here is my class OneShotLocationManager that gives the location for the user
when calling it from the ViewController it is working fine but when calling it from the ApplicationdidEnterBackground it is not working but but displaying each 0.4 UpdateLocation in the console !
func applicationDidEnterBackground(application: UIApplication) {
// Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
// If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
println("entered background")
var timer = NSTimer.scheduledTimerWithTimeInterval(0.4, target: self, selector: Selector("updateLocation"), userInfo: nil, repeats: true)
}
func updateLocation(){
// start location services, here
println("updateLocation")
var manager: OneShotLocationManager?
manager = OneShotLocationManager()
manager!.fetchWithCompletion {location, error in
// fetch location or an error
if let loc = location {
} else if let err = error {
println(err.localizedDescription)
}
println("end up")
manager = nil
}
}
override func viewDidLoad() {
super.viewDidLoad()
ViewController.UpdateLocation()
}
class func UpdateLocation(){
var manager: OneShotLocationManager?
manager = OneShotLocationManager()
manager!.fetchWithCompletion {location, error in
// fetch location or an error
if let loc = location {
println(loc.description)
} else if let err = error {
println(err.localizedDescription)
}
manager = nil
}
}
class OneShotLocationManager: NSObject, CLLocationManagerDelegate {
//location manager
private var locationManager: CLLocationManager?
//destroy the manager
deinit {
locationManager?.delegate = nil
locationManager = nil
}
typealias LocationClosure = ((location: CLLocation?, error: NSError?)->())
private var didComplete: LocationClosure?
//location manager returned, call didcomplete closure
private func _didComplete(location: CLLocation?, error: NSError?) {
locationManager?.stopUpdatingLocation()
didComplete?(location: location, error: error)
locationManager?.delegate = nil
locationManager = nil
}
//location authorization status changed
func locationManager(manager: CLLocationManager!, didChangeAuthorizationStatus status: CLAuthorizationStatus) {
switch status {
case .AuthorizedWhenInUse:
self.locationManager!.startUpdatingLocation()
case .Denied:
_didComplete(nil, error: NSError(domain: self.classForCoder.description(),
code: OneShotLocationManagerErrors.AuthorizationDenied.rawValue,
userInfo: nil))
default:
break
}
}
internal func locationManager(manager: CLLocationManager!, didFailWithError error: NSError!) {
_didComplete(nil, error: error)
}
internal func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!) {
if let location = locations[0] as? CLLocation {
_didComplete(location, error: nil)
} else {
_didComplete(nil, error: NSError(domain: self.classForCoder.description(),
code: OneShotLocationManagerErrors.InvalidLocation.rawValue,
userInfo: nil))
}
}
//ask for location permissions, fetch 1 location, and return
func fetchWithCompletion(completion: LocationClosure) {
//store the completion closure
didComplete = completion
//fire the location manager
locationManager = CLLocationManager()
locationManager!.delegate = self
//check for description key and ask permissions
if (NSBundle.mainBundle().objectForInfoDictionaryKey("NSLocationWhenInUseUsageDescription") != nil) {
locationManager!.requestWhenInUseAuthorization()
} else if (NSBundle.mainBundle().objectForInfoDictionaryKey("NSLocationAlwaysUsageDescription") != nil) {
locationManager!.requestAlwaysAuthorization()
} else {
fatalError("To use location in iOS8 you need to define either NSLocationWhenInUseUsageDescription or NSLocationAlwaysUsageDescription in the app bundle's Info.plist file")
}
}
}