CLLocationManager requestWhenInUseAuthorization（）不起作用

Question

我正在尝试在我的iOS应用中使用位置服务，但出于某种原因，requestWhenInUseAuthorization无效。当用户第一次使用该应用程序时，提示按正常方式询问权限，但是当您第二次打开应用程序时，由于某种原因didChangeAuthorizationStatus方法未被调用，因此我无法显示用户当前位置地图。

我的代码如下：

 override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib
    locationManager.delegate = self
    locationManager.requestWhenInUseAuthorization()
    var config:NSURLSessionConfiguration = NSURLSessionConfiguration.defaultSessionConfiguration()
    config.URLCache = NSURLCache(memoryCapacity: 2 * 1024 * 1024, diskCapacity: 10 * 1024 * 1024, diskPath: "MarkerData")
    markerSession = NSURLSession(configuration: config)
 }



 func locationManager(manager: CLLocationManager!, didChangeAuthorizationStatus status: CLAuthorizationStatus) {
    if status == .AuthorizedWhenInUse {

        locationManager.startUpdatingLocation()
        mapView.delegate = self
        mapView.myLocationEnabled = true
        mapView.settings.myLocationButton = true
     }
 }

Answer 1

首先，您需要在info.plist文件中添加NSLocationWhenInUseUsageDescription或NSLocationAlwaysUsageDescription（如果您想在后台使用）。见下图：

接下来，在您的swift文件中，您需要在locationManager.requestWhenInUseAuthorization()方法中调用locationManager.requestAlwaysAuthorization()或viewDidLoad()。

最后，您可以在locationManager委托方法中执行mapView.camera = GMSCameraPosition(target: locations.last!.coordinate, zoom: 15, bearing: 0, viewingAngle: 0)。

示例代码：

class ViewController: UIViewController, CLLocationManagerDelegate {

    var locationManager = CLLocationManager();

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        var camera = GMSCameraPosition.cameraWithLatitude(-33.86,
            longitude: 151.20, zoom: 6)
        var mapView = GMSMapView.mapWithFrame(CGRectZero, camera: camera)
        mapView.myLocationEnabled = true
        self.view = mapView

        locationManager.delegate = self
        locationManager.distanceFilter = kCLDistanceFilterNone
        locationManager.desiredAccuracy = kCLLocationAccuracyBest
        if #available(iOS 8.0, *) {
            print("iOS >= 8.0.0")
            locationManager.requestAlwaysAuthorization()
        }
        locationManager.startUpdatingLocation()

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!) {
        println(locations.last)

        var mapView = self.view as! GMSMapView

        mapView.camera = GMSCameraPosition(target: locations.last!.coordinate, zoom: 15, bearing: 0, viewingAngle: 0)
    }
}

您可以this post，了解有关iOS 8中LocationManager更改的更多详细信息。