ios - 仅在首次启动时出现 requestWhenInUseAuthorization 错误

Question

错误:

Trying to start MapKit location updates without prompting for location authorization. Must call -[CLLocationManager requestWhenInUseAuthorization] or -[CLLocationManager requestAlwaysAuthorization] first.

代码:

class ViewController: UIViewController {

    @IBOutlet weak var mapView: MKMapView!
    var locationManager: CLLocationManager!

    override func viewDidLoad() {
        super.viewDidLoad()

        locationManager = CLLocationManager()
        locationManager.requestAlwaysAuthorization()

        let currentLocationCoo = locationManager.location?.coordinate
        if let locationCoo = currentLocationCoo{
            mapView.region = MKCoordinateRegionMake(CLLocationCoordinate2D(latitude: locationCoo.latitude, longitude: locationCoo.longitude), MKCoordinateSpan(latitudeDelta: 0.002, longitudeDelta: 0.002))
            print("location ni nil")
        }else{


        mapView.region = MKCoordinateRegionMake(CLLocationCoordinate2D(latitude: 52.05695, longitude: 14.50575), MKCoordinateSpan(latitudeDelta: 0.002, longitudeDelta: 0.002))
        }

        let defaultAnnotation = MKPointAnnotation()
        defaultAnnotation.coordinate = mapView.region.center
        defaultAnnotation.title="Center"
        defaultAnnotation.subtitle="This is!"
        mapView.addAnnotation(defaultAnnotation)

        mapView.showsUserLocation=true
        mapView.showsBuildings=true
        mapView.userTrackingMode = .None

    }

我注意到 iOS 仅在首次启动时抛出错误。在我什至同意位置服务提示之前。在随后的发布中，它工作正常。是因为应用程序启动的第一个 View Controller 已经使用了 map 吗？解决方法可能不是直接跳转到 map ，而是先显示一些其他 VC。还有其他解决方法吗？

Answer 1

是的，您是对的，mapView.showsUserLocation=true 需要访问您的当前位置，如果不同意操作系统显示的警报，这是不可能的。您可以实现 CLLocationManagerDelegate 的 didChangeAuthorizationStatus 方法，并在其中包含与 map 相关的代码。尝试以下代码。

class ViewController: UIViewController,CLLocationManagerDelegate {

    @IBOutlet weak var mapView: MKMapView!
    var locationManager: CLLocationManager!

    override func viewDidLoad() {
        super.viewDidLoad()

        locationManager = CLLocationManager()
        locationManager.delegate = self
        locationManager.requestAlwaysAuthorization()
    }

    func locationManager(manager: CLLocationManager, didChangeAuthorizationStatus status: CLAuthorizationStatus) {
        switch status {
        case .AuthorizedWhenInUse:
            updateMap()
            break  
        case .AuthorizedAlways:
            updateMap()
            // write your map related code here
            break
        default:
            break
        }
    }

    func updateMap() {
        let currentLocationCoo = locationManager.location?.coordinate
        if let locationCoo = currentLocationCoo{
            mapView.region = MKCoordinateRegionMake(CLLocationCoordinate2D(latitude: locationCoo.latitude, longitude: locationCoo.longitude), MKCoordinateSpan(latitudeDelta: 0.002, longitudeDelta: 0.002))
            print("location ni nil")
        }else{
            mapView.region = MKCoordinateRegionMake(CLLocationCoordinate2D(latitude: 52.05695, longitude: 14.50575), MKCoordinateSpan(latitudeDelta: 0.002, longitudeDelta: 0.002))
        }

        let defaultAnnotation = MKPointAnnotation()
        defaultAnnotation.coordinate = mapView.region.center
        defaultAnnotation.title="Center"
        defaultAnnotation.subtitle="This is!"
        mapView.addAnnotation(defaultAnnotation)

        mapView.showsUserLocation=true
        mapView.showsBuildings=true
        mapView.userTrackingMode = .None
    }
}