离开后台后 locationManager.stopUpdateLocations 不起作用

我在后台使用地理定位跟踪，在应用程序处于后台几分钟后，locationManager.stopUpdateLocations() 调用停止工作 - 顶部的蓝条没​​有被删除，应用程序继续使用地理定位服务（即使启动地理定位后，您只需将应用程序最小化一次）。如果您调用 locationManager.stopUpdateLocations() 时没有将应用程序最小化到后台（或者如果您将应用程序最小化了很短的时间 1-2 分钟），那么服务将关闭并且顶部的蓝条消失。谁面临这个，帮助，我已经花了几天时间 - 都无济于事。禁用所有逻辑，唯一剩下的就是：启动地理定位服务（locationManager.startUpdateLocations）并尝试停止（locationManager.stopUpdateLocations）。

这是带有地理位置的类代码：

import CoreLocation

final class MyLocationService: NSObject, CLLocationManagerDelegate {

    private let locationManager = CLLocationManager()
    

    func sendCoord() {
        print("Send you coordinates")
    }
    
    func requestPermission() {
        locationManager.requestWhenInUseAuthorization()
    }
    
    func start() {
        locationManager.delegate = self
        locationManager.pausesLocationUpdatesAutomatically = false
        locationManager.allowsBackgroundLocationUpdates = true
        locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters
        locationManager.distanceFilter = 300
        locationManager.startUpdatingLocation()
        
        sendCoord()
        
    }
    
    func stop() {

        locationManager.pausesLocationUpdatesAutomatically = true
        locationManager.stopUpdatingLocation()
        locationManager.allowsBackgroundLocationUpdates = false
        locationManager.delegate = nil 
    }
    
    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    
        sendCoord()
    }
}

这是 ViewController 类代码：

import UIKit
import Foundation
import CoreLocation

class ViewController: UIViewController {
        
    // *** Internal variables *** //
    private let locationService = MyLocationService()
    var needPermissionForLocationServices = false

    @IBOutlet weak var toolBar: UIToolbar!
    
    @IBOutlet weak var startLocationToolBarButton: UIBarButtonItem!
    
    @IBAction func startLocationToolBarButtonAction(_ sender: UIBarButtonItem) {
        
    if CLLocationManager.locationServicesEnabled() {

            switch(CLLocationManager.authorizationStatus()) {

                case .notDetermined, .restricted, .denied:
           
                    DispatchQueue.main.async(execute: {

                        let alert = UIAlertController(title: "Error!", message: "Location services is off", preferredStyle: UIAlertController.Style.alert)
                alert.addAction(UIAlertAction(title: "Go to settings?", style: UIAlertAction.Style.default, handler: { (alert: UIAlertAction!) in
                print("")
                            UIApplication.shared.open(NSURL(string:UIApplication.openSettingsURLString)! as URL)
                        }))
                        self.present(alert, animated: true, completion: nil)
                    })
                    
                case .authorizedAlways, .authorizedWhenInUse:

                    locationService.start()
                  
                    DispatchQueue.main.asyncAfter(deadline: .now() + 1.0) {
                        self.tableView.reloadData()
                    }
                    if action.lRefresh {
                        refreshAfterAction(action: action)
                    }
                }
            } else {
                DispatchQueue.main.async(execute: {
                   let alert = UIAlertController(title: "Error!", message: "Location services is off", preferredStyle: UIAlertController.Style.alert)
                alert.addAction(UIAlertAction(title: "Go to settings?", style: UIAlertAction.Style.default, handler: { (alert: UIAlertAction!) in
                print("")
                    UIApplication.shared.open(NSURL(string:UIApplication.openSettingsURLString)! as URL)
                    }))
                    self.present(alert, animated: true, completion: nil)
                })
                locationService.requestPermission()
            }
         
    }

    @IBOutlet weak var stopLocationToolBarButton: UIBarButtonItem!
    
    @IBAction func stopLocationToolBarButtonAction(_ sender: UIBarButtonItem) {
        
        locationService.stop()
         
    }
    
    // *** View Controller Functions *** //
    
    deinit {
        print("Deinit: VC NO MEMORY LEAKS")
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        locationService.requestPermission()
        
    }
    
    override func viewDidDisappear(_ animated: Bool) {

    }
    
    override func viewWillAppear(_ animated: Bool) {
       
        view.backgroundColor = UIColor.white
    }
    
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    
    }
}