ios - Swift + didUpdateUserLocation 没有被调用

Question

我无法调用 MKMapView委托(delegate)方法 didUpdateUserLocation .

到目前为止我做了什么:

1. 添加框架 MapKit.framwork在项目中

2. 在 View Controller 中导入框架 import MapKit行

3. 在plist文件中添加 key

   <key>NSLocationAlwaysUsageDescription</key>
<true/>

4. View Controller 中的代码

添加委托(delegate) didUpdateUserLocation检查位置的方法是否已更新但从未调用过。

// MARK: - MapView delegate methods

func mapView(mapView: MKMapView!, regionDidChangeAnimated animated: Bool) {
    // Calling...
}

func mapView(mapView: MKMapView!, didUpdateUserLocation userLocation: MKUserLocation!) {
   // Not getting called
}

// MARK: - View lifeCycle methods   
override func viewDidLoad() {
    super.viewDidLoad()
    var locationManager = CLLocationManager()
    locationManager.delegate = self
    locationManager.desiredAccuracy = kCLLocationAccuracyBest
    locationManager.requestWhenInUseAuthorization()

    locationManager.startUpdatingLocation()

    self.mapView.delegate = self
    self.mapView.showsUserLocation = true
    self.mapView.pitchEnabled = true
    self.mapView.showsBuildings = true
}

我已经使用模拟器并更改模拟器自定义位置来检查它是否被调用？方法regionDidChangeAnimated被称为完美!

同样的事情适用于 iOS7。 Swift map 位置更新还需要做哪些额外工作？

编辑: Plist 键

也没有提示权限警报。

Answer 1

1. 您必须保留对 CLLocationManager 的引用。
2. 在 .startUpdatingLocation() 和 showsUserLocation = true 之前，您必须等待调用 locationManager(_:didChangeAuthorizationStatus:) 委托(delegate)方法。
3. 根据 the document : NSLocationWhenInUseUsageDescription 值类型为字符串。

尝试:

class ViewController: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate {

    @IBOutlet weak var mapView: MKMapView!

    var locationManager = CLLocationManager()

    // MARK: - View lifeCycle methods
    override func viewDidLoad() {
        super.viewDidLoad()
        self.locationManager.delegate = self
        self.locationManager.desiredAccuracy = kCLLocationAccuracyBest
        self.locationManager.requestWhenInUseAuthorization()

        self.mapView.delegate = self
        self.mapView.pitchEnabled = true
        self.mapView.showsBuildings = true
    }

    // MARK: - LocationManager delegate methods

    func locationManager(manager: CLLocationManager!, didChangeAuthorizationStatus status: CLAuthorizationStatus) {
        switch status {
        case .Authorized, .AuthorizedWhenInUse:
            manager.startUpdatingLocation()
            self.mapView.showsUserLocation = true
        default: break
        }
    }

    // MARK: - MapView delegate methods


    func mapView(mapView: MKMapView!, didUpdateUserLocation userLocation: MKUserLocation!) {
        println(userLocation)
        // Not getting called
    }

}