当我使用核心位置管理器时，估计iBeacons未检测到

我已经写了下面的代码

var locationManager: CLLocationManager!

    override func viewDidLoad() {
        super.viewDidLoad()

        locationManager = CLLocationManager()
        locationManager.delegate = self
        locationManager.pausesLocationUpdatesAutomatically = false
        locationManager.allowsBackgroundLocationUpdates = true
        locationManager.requestAlwaysAuthorization()

    }

    func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
        if status == .authorizedWhenInUse {
            if CLLocationManager.isMonitoringAvailable(for: CLBeaconRegion.self) {
                if CLLocationManager.isRangingAvailable() {
                    startScanning()
                }
            }
        }
    }

    func locationManager(_ manager: CLLocationManager, didRangeBeacons beacons: [CLBeacon], in region: CLBeaconRegion) {
        if beacons.count > 0 {
            NSLog("Found beacon")
        } else {
            NSLog("Beacon not found")
        }
    }

    func locationManager(_ manager: CLLocationManager, didEnterRegion region: CLRegion) {
        let beaconRegion = region as! CLBeaconRegion
        print("Did enter region: " + (beaconRegion.major?.stringValue)!)
    }

    func locationManager(_ manager: CLLocationManager, didExitRegion region: CLRegion) {
        let beaconRegion = region as! CLBeaconRegion
        print("Did exit region: " + (beaconRegion.major?.stringValue)!)
    }

    func startScanning() {

        let uuid = UUID(uuidString: "B9407F30-F5F8-466E-AFF9-25556B57FE6D")!
        let beaconRegion = CLBeaconRegion(proximityUUID: uuid, major: CLBeaconMajorValue(0), minor: CLBeaconMinorValue(1), identifier: "MyBeacon")

        beaconRegion.notifyEntryStateOnDisplay = true
        beaconRegion.notifyOnEntry = true
        beaconRegion.notifyOnExit = true

               locationManager.startMonitoring(for: beaconRegion)
        locationManager.startRangingBeacons(in: beaconRegion)
    }
}

我正在使用Xcode 11.2和Swive 5。我已经面对这个问题很多天了，我读了那么多关于苹果的评论和文件，但没有得到解决。如果有任何一个与iBeacons一起工作，那么请给出ANS，如果您有代码演示，也可以与我分享。