在swift中显示MKMapView中的当前位置

Question

我对Swift相当新，以下代码并没有要求我提供位置权限或在MKMapView中显示我当前的位置。我已经将NSLocationAlwaysUsageDescription添加到我的info.plist，但我的模拟器仍然没有要求我的位置许可或显示我当前的loc。

import UIKit
import MapKit
import CoreLocation

class MapViewController: UIViewController, CLLocationManagerDelegate {
  @IBOutlet var mapView: MKMapView!
  var locationManager: CLLocationManager!

  override func viewDidLoad() {
        super.viewDidLoad()

    if (CLLocationManager.locationServicesEnabled())
    {
      locationManager = CLLocationManager()
      locationManager.delegate = self
      locationManager.desiredAccuracy = kCLLocationAccuracyBest
      locationManager.requestAlwaysAuthorization()
      locationManager.startUpdatingLocation()
    }
  }

  func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    if let location = locations.last
    {
      let center = CLLocationCoordinate2D(latitude: location.coordinate.latitude, longitude: location.coordinate.longitude)
      let region = MKCoordinateRegion(center: center, span: MKCoordinateSpan(latitudeDelta: 0.01, longitudeDelta: 0.01))
      self.mapView.setRegion(region, animated: true)
    }
  }

}

提前致谢。

Answer 1

您在启用位置服务时请求授权。永远不会执行if块，因为默认情况下禁用位置服务。而是检查authorizationStatus == kCLAuthorizationStatusNotDetermined的授权状态，然后请求授权。