fatal error: unexpectedly found nil while unwrapping an Optional value when getting Location? - ios

Question

I am developing an app using swift I want to fetch current location of the user and want to show in google map so I wrote my code in my class I have included all the functions and methods (i.e) added and imported frameworks core location and also updated plist but I can't able to fetch current location rotationally some time I get the location but some time it crashed.
Here is the code what I am tried.
import CoreLocation
class HomeViewController: UIViewController, CLLocationManagerDelegate {
override func viewDidLoad() {
super.viewDidLoad()
locationManager = CLLocationManager()
locationManager.delegate = self
locationManager.requestWhenInUseAuthorization()
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.distanceFilter = kCLDistanceFilterNone
locationManager.startUpdatingLocation()
let location: CLLocation? = locationManager.location
let coordinate: CLLocationCoordinate2D? = location?.coordinate ----> App crossed this line then it will crashed
print(coordinate!)
print(coordinate!.latitude)
print(coordinate!.longitude)
strForCurLatitude = "\(coordinate!.latitude)"
strForCurLongitude = "\(coordinate!.longitude)"}
func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
if status == .authorizedWhenInUse {
print("User allowed us to access location")
}
}
func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
print("Error while get location \(error)")
}
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
locationManager.startUpdatingLocation()
let locationNew = locations.last
let coordinateNew: CLLocationCoordinate2D? = locationNew?.coordinate
strForCurLatitude = "\(coordinateNew!.latitude)"
strForCurLongitude = "\(coordinateNew!.longitude)"
strForLat=strForCurLatitude;
strForLong=strForCurLongitude;
print("User's Latitude is: \(Double(strForLat!)!)")
print("User's Longitude is: \(Double(strForLong!)!)")
self.locationManager.startUpdatingLocation()
}

Answer 1

Remove this from ViewDidLoad because you can not get location in viewDidLoad.
let location: CLLocation? = locationManager.location
let coordinate: CLLocationCoordinate2D? = location?.coordinate
print(coordinate!)
print(coordinate!.latitude)
print(coordinate!.longitude)
strForCurLatitude = "\(coordinate!.latitude)"
strForCurLongitude = "\(coordinate!.longitude)"
In CLLocationManager's following method best for getting location
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
}

Answer 2

make a reference to CLLocationManager as variable, like this:
class HomeViewController {
var locationManager = CLLocationManager()
viewDidLoad() {
super.viewDidLoad()
}
// rest of code
}
in this case Location Manager should works properly.