为什么我的 didUpdate 用户位置方法没有被调用？

Question

我的视图中有一个MapKit，我想访问userLocation数据。然而，的实际功能

func firstMapView(_ firstMapView: MKMapView, didUpdateUserLocation userLocation: MKUserLocation){
print("it never gets called")
}

永远不会被召唤。

整个代码如下所示：

import UIKit
import MapKit
import CoreLocation
class ViewController: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate{
@IBOutlet weak var firstMapView: MKMapView!
let locationManager = CLLocationManager()

override func viewDidLoad() {
super.viewDidLoad()

locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.requestWhenInUseAuthorization()

firstMapView.delegate = self
}


func firstMapView(_ firstMapView: MKMapView, didUpdateUserLocation userLocation: MKUserLocation){
print("it never gets called")
}

func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
if status == .authorizedWhenInUse {
print("Authorized when in use detected")
locationManager.startUpdatingLocation()
firstMapView.showsUserLocation = true
}
}
}

当我运行代码时，我得到调试消息：print("Authorized when in use detected")

我看到了这个问题，并试图复制这些东西，但无济于事。

Answer 1

使用此委托函数

func mapView(mapView: MKMapView!, didUpdateUserLocation userLocation: MKUserLocation!) {
print(userLocation)
}

删除这个

func firstMapView(_ firstMapView: MKMapView, didUpdateUserLocation userLocation: MKUserLocation){
print("it never gets called")
}