Make user location visible on the map does not work - ios

Question

If I am running my code the rounded blue point isn't shown up on the map. user location visible on the map does not work. I can't find the problem for that. Anyone who can find the issue?
import UIKit
import MapKit
import CoreLocation
class GPSNewBin: UIViewController, CLLocationManagerDelegate {
#IBOutlet weak var mapView: MKMapView!
#IBOutlet weak var zurueckButton: UIButton!
var locationManager = CLLocationManager()
override func viewDidLoad() {
super.viewDidLoad()
// Ask for Authorisation from the User.
self.locationManager.requestAlwaysAuthorization()
// For use in foreground
self.locationManager.requestWhenInUseAuthorization()
if CLLocationManager.locationServicesEnabled() {
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters
locationManager.startUpdatingLocation()
}
}
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
//guard let locValue: CLLocationCoordinate2D = manager.location?.coordinate else { return }
let locValue: CLLocationCoordinate2D = manager.location!.coordinate
print("locations = \(locValue.latitude) \(locValue.longitude)")
let userLocation = locations.last
let viewRegion = MKCoordinateRegion(center: (userLocation?.coordinate)!, latitudinalMeters: 600, longitudinalMeters: 600)
self.mapView.setRegion(viewRegion, animated: true)
}
}
Thanks a lot :)

Answer 1

You can enable user location from a storyboard:
OR
You can also enable it using code:
mapView.showsUserLocation = true

Answer 2

You must include following properties in Info.plist, without it your request for authorization will not work.
<key>NSLocationAlwaysAndWhenInUseUsageDescription</key>
<string>Message for AlwaysAndWhenInUseUsageDescription</string>
<key>NSLocationAlwaysUsageDescription</key>
<string>Message for AlwaysUsageDescription</string>
<key>NSLocationWhenInUseUsageDescription</key>
<string>Message for WhenInUseUsageDescription</string>
Use following method for requesting authorization in viewDidLoad, it also takes in account when location services is denied to the app.
func checkLocationAuthorization(authorizationStatus: CLAuthorizationStatus? = nil) {
switch (authorizationStatus ?? CLLocationManager.authorizationStatus()) {
case .authorizedAlways, .authorizedWhenInUse:
mapView.showsUserLocation = true
case .notDetermined:
locationManager.requestWhenInUseAuthorization()
default:
print("Location Servies: Denied / Restricted")
}
}
checkLocationAuthorization in viewDidLoad
override func viewDidLoad() {
super.viewDidLoad()
if CLLocationManager.locationServicesEnabled() {
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters
locationManager.startUpdatingLocation()
}
self.checkLocationAuthorization()
}
You must also update the authorization status, when a CLLocationManagerDelegate.locationManager(_:didChangeAuthorization:) is occurred, you can re-use above method, like so:
extension GPSNewBin: CLLocationManagerDelegate {
func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
self.checkLocationAuthorization(authorizationStatus: status)
}
}
When updating location in didUpdateLocations, use the updated user location sent in userLocation.coordinate, like so:
extension GPSNewBin: MKMapViewDelegate {
func mapView(_ mapView: MKMapView, didUpdate userLocation: MKUserLocation) {
let region = MKCoordinateRegion(center: userLocation.coordinate, latitudinalMeters: 600, longitudinalMeters: 600)
mapView.setRegion(region, animated: true)
}
}