swift - 尝试启动MapKit位置更新而没有提示位置授权

在我的应用程序中，我使用MKMapKit和MKUserTrackingBarButtonItem来定位用户。当我点击此按钮时，输出控制台将返回此错误:



据我说，造成此错误的原因是还没有调用requestWhenInUseAuthorization()。实际上，MKUserTrackingBarButtonItem Tap会先调用功能性mapViewWillStartLocatingUser，该功能先假定CLLocationManager requestWhenInUseAuthorization:

 func mapViewWillStartLocatingUser(mapView: MKMapView!) {
    println("**** mapViewWillStartLocatingUser ****")

    // i servizi di localizzazione sono abilitati?
    if (CLLocationManager.locationServicesEnabled())
    {
        // setto il locationManager ed il delegate
        locationManager = CLLocationManager()
        locationManager.delegate = self

        // abbiamo l'autorizzazione ad accedere ai servizi di localizzazione?
        switch CLLocationManager.authorizationStatus(){
        case .Denied:
            // no
            displayAlertToEnableLocationServicesApp()
            //displayAlertWithTitle("Denied", message: "Location services are not allowed for this app")
        case .Restricted:
            // no
            displayAlertToEnableLocationServicesApp()
        case .NotDetermined:
            // bisogna chiedere all'utente
            println("Not Determined")
            if (locationManager != nil)
            {
                locationManager.requestWhenInUseAuthorization()
            }
        default:
            // si
            println("Authorized")
            if (locationManager != nil)
            {
                locationManager.desiredAccuracy = kCLLocationAccuracyBest
                locationManager.startUpdatingLocation()
            }
        }

    }
    else
    {
        println("Location services are not enabled")

        displayAlertWithTitle("Location Services are Turned Off", message: "Please open settings and turn on location services")
    }
}

// funzione della mappa
func mapView(mapView: MKMapView!, didFailToLocateUserWithError error: NSError!) {
    println("**** didFailToLocateUserWithError **** ", error)
}

// funzione della mappa
func mapView(mapView: MKMapView!, didChangeUserTrackingMode mode: MKUserTrackingMode, animated: Bool) {
    println("**** didChangeUserTrackingMode ****")
}

// funzione del CoreLocation che setta la visuale in base alla localizzaizone dell'utente
func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!) {
    println("**** didUpdateLocations ****")

    //self.mapView.showsUserLocation = true


    // aggiorno le coordinate dell'utente
    posizioneUtente = (locations[0] as CLLocation).coordinate
    //posizioneUtente = manager.location.coordinate
    println("Posizione utente aggiornata (lat: \(posizioneUtente.latitude) long: \(posizioneUtente.longitude))")

    // setto la camera sulla posizione dell'utente
    var camera = MKMapCamera(lookingAtCenterCoordinate: posizioneUtente, fromEyeCoordinate: posizioneUtente, eyeAltitude: 500)
    // utilizzo un'animazione più lenta
    UIView.animateWithDuration(1.8, animations:{
        self.mapView.camera = camera
    })

    locationManager.stopUpdatingLocation()

    // cambio l'icona del bottone della localizzazione
    //locationOutlet.setImage(UIImage(named: "LocalizzazioneEmpty"), forState: UIControlState.Normal)

}



// funzione del CoreLocation
func locationManager(manager: CLLocationManager!, didFailWithError error: NSError!)
{
    println("**** didFailWithError ****")
    println("Error: \(error.localizedDescription)")
}

// funzione del CoreLocation
func locationManager(manager: CLLocationManager!, didChangeAuthorizationStatus status: CLAuthorizationStatus) {
    print("The authorization status of location " + "services is changed to: ")

    switch CLLocationManager.authorizationStatus(){
    case .Denied:
        println("Denied")
    case .NotDetermined:
        println("Not determined")
    case .Restricted:
        println("Restricted")
    default:
        println("Authorized")
    }
}

我自然地添加了Info.plist键:NSLocationWhenInUseUsageDescription。

我的问题是:在启动mapViewWillStartLocatingUser之前，如何在MKUserTrackingBarButtonItem水龙头上调用CLLocationManager requestWhenInUseAuthorization。我希望用户在点击按钮时应获得提示，而在viewDidLoad中则不显示

谢谢
对不起我的英语不好

最佳答案

当您调用requestWhenInUseAuthorization时，如果该权限尚未得到授权，则系统会提示用户该权限。用户授予该权限后，该问题将不再出现。

要对用户的响应使用react，您必须实现locationManager(_:didChangeAuthorizationStatus:)协议(protocol)中的CLLocationManagerDelegate，并且只有在用户授予许可的情况下才启动startUpdateLocations()。

关于swift - 尝试启动MapKit位置更新而没有提示位置授权，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/29396679/