Is that possible to receive Location even when app is not running in Swift - ios

Question

I am making an app that trace all the trips made by a user.
The app works perfectly when it is in background or in foreground but I am looking for a way to get it worked even if the app is not running.
I followed exactly this answer : Receiving Location even when app is not running in Swift
But this doesn't work as expected.
I have two property in my AppDelegate
var lastLocation:CLLocation?
//And a location manager
var locationManager = CLLocationManager()
In my DidFinishLaunchingWithOptions I configure the CLLocationManager
locationManager.delegate = self
locationManager.requestAlwaysAuthorization()
locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters
In my applicationWillTerminate :
lastLocation = HomeController.locations.last
createRegion(location: lastLocation)
Here is the rest :
func createRegion(location:CLLocation?) {
if CLLocationManager.isMonitoringAvailable(for: CLCircularRegion.self) {
let coordinate = CLLocationCoordinate2DMake((location?.coordinate.latitude)!, (location?.coordinate.longitude)!)
let regionRadius = 50.0
let region = CLCircularRegion(center: CLLocationCoordinate2D(
latitude: coordinate.latitude,
longitude: coordinate.longitude),
radius: regionRadius,
identifier: "aabb")
region.notifyOnExit = true
region.notifyOnEntry = true
//Send your fetched location to server
UserDefaults.standard.set(UserDefaults.standard.integer(forKey: "nbLocNotrunning") + 1, forKey: "nbLocNotrunning")
//Stop your location manager for updating location and start regionMonitoring
self.locationManager.stopUpdatingLocation()
self.locationManager.startMonitoring(for: region)
} else {
print("System can't track regions")
}
}
func locationManager(_ manager: CLLocationManager, didEnterRegion region: CLRegion) {
print("Entered Region")
}
func locationManager(_ manager: CLLocationManager, didExitRegion region: CLRegion) {
print("Exited Region")
locationManager.stopMonitoring(for: region)
//Start location manager and fetch current location
locationManager.startUpdatingLocation()
}
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
if UIApplication.shared.applicationState != .inactive {
} else {
//App is in BG/ Killed or suspended state
//send location to server
// create a New Region with current fetched location
let location = locations.last
lastLocation = location
//Make region and again the same cycle continues.
self.createRegion(location: lastLocation)
}
}
I wonder where the mistake can come from and why I never enter in the function didExitRegion.
For now, I just increment a variable in UserDefaut "nbLocNotrunning" in order to know how many times I leave a region but this number never increase when I stop my app.