即使應用程序在后台運行，如何使用swift在ios中獲取位置更新

Question

我正在開發一個應用程序，我需要定期更新用戶的位置，但是當應用程序暫停或在后台運行時，我無法獲得位置更新。 我還在功能中啟用了后台位置更新。

viewDidLoad代碼：

override func viewDidLoad() {
        super.viewDidLoad()
        locationManager.delegate = self
        locationManager.desiredAccuracy = kCLLocationAccuracyBest
        locationManager.allowsBackgroundLocationUpdates = true
        locationManager.requestAlwaysAuthorization()
        locationManager.requestWhenInUseAuthorization()
        let user=FIRAuth.auth()?.currentUser?.displayName
        if(CLLocationManager.authorizationStatus() == CLAuthorizationStatus.authorizedAlways || CLLocationManager.authorizationStatus() == CLAuthorizationStatus.authorizedWhenInUse){
            locationManager.requestLocation()
            location=locationManager.location
            locationManager.startUpdatingLocation()
            locationManager.startMonitoringSignificantLocationChanges()
            //updating to database
            ref.child("\(user!)/lat").setValue(location.coordinate.latitude)
            ref.child("\(user!)/long").setValue(location.coordinate.longitude)
            //location=locationManager.location
        }
}

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        location=locations[locations.count-1]
    }

Answer 1

啟用位置更新 - >背景模式 - >功能

我正在使用這種方法在后台獲取位置。 此方法在AppDelegate類中編寫

 func getLocation() {
    self.locationManager = CLLocationManager()
    self.locationManager.delegate = self
    if self.locationManager.responds(to: #selector(self.requestAlwaysAuthorization)) {
        self.locationManager.requestAlwaysAuthorization()
    }
    self.locationManager.distanceFilter = kCLDistanceFilterNone
    self.locationManager.desiredAccuracy = kCLLocationAccuracyBest
    if !CLLocationManager.locationServicesEnabled() {
            // location services is disabled, alert user
        var servicesDisabledAlert = UIAlertView(title: "Alert", message: "Location service is disable. Please enable to access your current location.", delegate: nil, cancelButtonTitle: "OK", otherButtonTitles: "")
        servicesDisabledAlert.show()
    }
    else {
        self.locationManager.startUpdatingLocation()
    }
}