CLLocationManagerDelegate 方法不运行

Question

我正在尝试创建一个只有地图视图的应用程序，上面有一个“显示用户位置”按钮，我在 MapKit 的帮助下实现了该按钮。通过按下按钮，我还想获得用户坐标，为此我使用了 CLLocationManagerDelegate 方法，但我遇到了麻烦运行。我确实在 plist 中设置了“Privacy - Location When In Use Usage Description”字符串。

这是我的代码 MapViewController:

import UIKit
import MapKit
import CoreLocation

class MapViewController: UIViewController, CLLocationManagerDelegate {
    // MARK: - Properties
    @IBOutlet weak var mapView: MKMapView!
    let locationManager = CLLocationManager()
    
    var fetchedData = ""
    
    // MARK: - Lifecycle
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
    }
    
    // MARK: - Actions
    // this puts user location on map
    @IBAction func showUserLocation() {
        // check for location tracing permissions first
        let authStatus = CLLocationManager.authorizationStatus()
        
        if authStatus == .notDetermined {
            locationManager.requestWhenInUseAuthorization()
            return
        } else if authStatus == .denied || authStatus == .restricted {
            showLocationServicesDeniedAlert()
            return
        }
        
        let region = MKCoordinateRegion(center: mapView.userLocation.coordinate, latitudinalMeters: 1000, longitudinalMeters: 1000)

        mapView.setRegion(mapView.regionThatFits(region), animated: true)
        
        getCoordinates()
    }
    
    // MARK: - Helper methods
    // handle permission errors
    func showLocationServicesDeniedAlert() {
        let alert = UIAlertController(title: "Paikannuspalvelut pois päältä", message: "Ole hyvä ja salli paikannuspalvelut tälle äpille.", preferredStyle: .alert)
        
        let okAction = UIAlertAction(title: "OK", style: .default, handler: nil)
        alert.addAction(okAction)
        
        present(alert, animated: true, completion: nil)
    }
    
    // get user coordinates
    func getCoordinates() {
        locationManager.delegate = self
        locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters
        locationManager.startUpdatingLocation()
    }
    
}

// MARK: - MKMapViewDelegate
extension MapViewController: MKMapViewDelegate {
    
}

// MARK: - CLLocationManagerDelegate
func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
    print("*** Location manager failed with error: \(error.localizedDescription)")
}

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    let newLocation = locations.last!
    print("*** didUpdateLocations \(newLocation)")
}

Answer 1

当应用程序运行时，请确保位置未设置为“None”。

当模拟器处于活动状态时，您可以在状态栏上找到这些选项。

Answer 2

感谢大家的投入！一旦我移动 CLLocationManagerDelegate 视图控制器内部的方法 class 一切就开始正常工作了。

Answer 3

我了解到您已成功发现。太好了。

但我可能会建议 adding the protocol conformance in an extension 您的 class，而不是在主要实现中。这使您的代码井井有条。例如：

import UIKit
import MapKit
import CoreLocation

class MapViewController: UIViewController {
    // MARK: - Properties

    ...
    
    // MARK: - Lifecycle

    override func viewDidLoad() { ... }
    
    // MARK: - Actions

    // this puts user location on map
    @IBAction func showUserLocation() { ... }
    
    // MARK: - Helper methods

    // handle permission errors
    func showLocationServicesDeniedAlert() { ... }
    
    // get user coordinates
    func getCoordinates() { ... } 
}

// MARK: - MKMapViewDelegate

extension MapViewController: MKMapViewDelegate { ... }

// MARK: - CLLocationManagerDelegate

extension MapViewController: CLLocationManagerDelegate {
    func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
        print("*** Location manager failed with error: \(error.localizedDescription)")
    }
    
    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        let newLocation = locations.last!
        print("*** didUpdateLocations \(newLocation)")
    }
}

CLLocationManagerDelegate 方法不运行

CLLocationManagerDelegate methods do not run

core-location

mapkit

ios

swift

CLLocationManagerDelegate 方法不 运行

CLLocationManagerDelegate methods do not run

core-location

mapkit

ios

swift

CLLocationManagerDelegate 方法不运行