How to save coordinates to Firebase Swift 2 - ios

Question

I want to save a set of latitude and longitude coordinates to Firebase, but whenever my app runs through this code it crashes!
let userID: String = (FIRAuth.auth()?.currentUser?.uid)!
let lat: Double = (locationManager.location?.coordinate.latitude)!
let lon: Double = (locationManager.location?.coordinate.longitude)!
self.ref.child("Location").child(userID).setValue(["Latitude": lat, "Longitude": lon])
Is there anyway I can fix this and save it properly and efficiently?

Answer 1

Make sure of two things :-
1.) your viewController inherits from CLLocationManagerDelegate and has its delegate set to self in viewDidLoad
2.) your info.plist has these keys added to them :-
NSLocationAlwaysUsageDescription --- I need Location
NSLocationWhenInUseUsageDescription --- I need Location
privacy - location usage description --- I need Location
class MapViewController: UIViewController , CLLocationManagerDelegate...{
...
..
let locationManager = CLLocationManager()
func viewDidLoad(){
super.viewDidLoad()
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.distanceFilter = kCLDistanceFilterNone
locationManager.requestWhenInUseAuthorization()
locationManager.startMonitoringSignificantLocationChanges()
locationManager.startUpdatingLocation()
}
//Call these functions for updating the getting the values of current location
func locationManager(manager: CLLocationManager, didChangeAuthorizationStatus status: CLAuthorizationStatus) {
if status == .AuthorizedWhenInUse {
print("authorised call came . . . . ")
mapView.myLocationEnabled = true
}
}
func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
if let location = locations.first {
print("target position : = \(location.coordinate)")
print(locationManager.location!.coordinate.latitude)
mapView.camera = GMSCameraPosition(target: location.coordinate, zoom: 15, bearing: 0, viewingAngle: 0)
locationManager.stopUpdatingLocation()
self.FIRDatabase.database().reference().child("Location").child(FIRAuth.auth()!.currentUser!.uid).setValue(["Latitude": locationManager.location!.coordinate.latitude, "Longitude": locationManager.location!.coordinate.longitude])
}
}
}