位置坐标还不是NILL，请在加载应用程序时获得更新的标签，但如果我从另一个屏幕回来，请加载

Question

我已经定义了一个全局变量，以在应用程序启动后立即在AppDelegate中存储位置坐标和IM更新位置。这是为此的代码：

var locationManager:CLLocationManager!

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
     // Override point for customization after application launch.
        
      window = UIWindow(frame: UIScreen.main.bounds)
        
      determineCurrentLocation()
        
      self.pushToHomeScreen()
        
      return true
}

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        if GlobalUserManager.shared.currentLocation == nil {
            GlobalUserManager.shared.currentLocation = locations.last
            locationManager.stopUpdatingLocation()
        }
    }

    func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
        print("Error - locationManager: \(error.localizedDescription)")
    }

    //MARK:- Intance Methods
    func determineCurrentLocation() {
        locationManager = CLLocationManager()
        locationManager.delegate = self
        locationManager.desiredAccuracy = kCLLocationAccuracyBest
        locationManager.requestAlwaysAuthorization()

        if CLLocationManager.locationServicesEnabled() {
            locationManager.startUpdatingLocation()
        }
    }

之后，主屏幕打开了我有两个标签以显示位置数据的地方。当我尝试通过将代码放入viewDidload（）和viewWillAppear（）中，当我尝试将代码放入viewDidload（）时，它都没有得到更新。因此，我尝试将代码放入viewDidappear（）及其类似的内容中：

override func viewDidAppear(_ animated: Bool) {
        if GlobalUserManager.shared.currentLocation != nil {
            lblLat.text = GlobalUserManager.shared.currentLocation.latitude
            lblLong.text = GlobalUserManager.shared.currentLocation.longitude
        }
        else {
            lblLat.text = "Lat not available"
            lblLong.text = "Long not available"
        }
    }

当屏幕加载时，标签为空，至少意味着globalusersermanager.shared.currentlocation.currentlocation！= nil nil 但是我希望他们在加载屏幕后立即进行更新。取而代之的是，我必须单击另一个页面然后返回，然后进行更新。