CLFloor返回2146959360层?

我正在使用 CLLocationManager location 属性和检查 level 的 floor ,如果有的话。文件显示如果它不能确定 地板 nil . 实际上,我得到了一个 CLFloor 水平

lazy var locationManager: CLLocationManager = {
    let locationManager = CLLocationManager()
    locationManager.delegate = self
    locationManager.desiredAccuracy = kCLLocationAccuracyBest
    return locationManager
}()

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)

    switch CLLocationManager.authorizationStatus() {
    case .notDetermined: locationManager.requestWhenInUseAuthorization()
    case .denied:        redirectToSettings()
    default:             break
    }
}

@IBAction func didTapGetLocation(_ sender: Any) {
    updateLabels(for: locationManager.location)
}

func updateLabels(for location: CLLocation?) {
    guard let location = location else {
        floorLabel.text = "No location."
        return
    }

    if let floor = location.floor {
        let hexString = "0x" + String(format: "%08x", floor.level)
        floorLabel.text = "\(floor.level) (\(hexString))"
    } else {
        floorLabel.text = "No floor."
    }
}

,与预期一样,模拟器也是如此。

怎么回事?