位置更新时未收到通知

Question

我创建了一个通知，该通知将在位置更新可用时发送：

func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {

        // If we don't have a valid location, exit
        guard let location = locations.first where (location.horizontalAccuracy <= 20 || location.timestamp.timeIntervalSinceNow < 5 ) else {
            return
        }

        // or if we already have searched, return
        guard !didPerformGeocode else {
            return
        }

        // otherwise, update state variable, stop location services and start geocode
        self.didPerformGeocode = true

        // Set current user location
        currentUserLocation = location

        // Send notification about changed location
        notificationCenter.postNotificationName("LOCATION_AVAILABLE", object: nil, userInfo: ["location":self.currentUserLocation!])

        // Stop location search before geocode
        self.locationManager?.stopUpdatingLocation()
        self.geocodeLocation(location)
    }

我想在tableViewController中收到此通知：

class AEDTableViewController: UITableViewController {

    // MARK: - Notifications
    let notificationCenter = NSNotificationCenter.defaultCenter()

    // MARK: - Location
    var currentLocation: CLLocation = CLLocation()

    // MARK: - View Lifecycle
    override func viewDidLoad() {
        super.viewDidLoad()
        notificationCenter.addObserver(self, selector: "aedListReceived:", name: "AED_LIST_UPDATED", object: nil)
        notificationCenter.addObserver(self, selector: "locationAvailable:", name: "LOCATION_AVAILABLE", object: nil)
    }

    deinit {
        notificationCenter.removeObserver(self)
    }

    func locationAvailable(notification: NSNotification) {
        let userInfo = notification.userInfo as! Dictionary<String, AnyObject>
        self.currentLocation = userInfo["location"] as! CLLocation
        self.tableView.reloadData()
    }
}

但即使我看到更新的位置，也不会收到通知。当我想调试它时，我发现它从不调用notificationObserver中提到的方法。