ios SWIFT found nil while unwrapping option value. - ios

Question

After doing some research and asking other question on stack i can not seem to figure out the issue. Yet i have come far.
I am new to Stack so please let me know if i need to provide more information.
The error is appering at
self.mapView.showsUserLocation = true
Saying in the compiler
fatal error: unexpectedly found nil while unwrapping an Option Value
IIDB
if i delete that line the error appears on a another .mapView. line.
When i move the line where the error appear, and put it under:
func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
The app opens and everything works fine, except it dont show the location, but i am able to run the app without getting any error.
Thank you for your time.
Here is my codes if someone need it.
import UIKit
import Parse
import CoreLocation
import MapKit
class ViewController: UIViewController, CLLocationManagerDelegate, MKMapViewDelegate {
#IBOutlet weak var mapView: MKMapView!
let locationManager = CLLocationManager()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.locationManager.delegate = self
self.locationManager.desiredAccuracy = kCLLocationAccuracyBest
self.locationManager.requestWhenInUseAuthorization()
self.locationManager.startUpdatingLocation()
self.mapView.showsUserLocation = true
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// MARK: - Location Delegate Methods
func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
let location = locations.last
let center = CLLocationCoordinate2D(latitude: location!.coordinate.latitude, longitude: location!.coordinate.longitude)
let region = MKCoordinateRegion(center: center, span: MKCoordinateSpan(latitudeDelta: 1, longitudeDelta: 1))
self.mapView.setRegion(region, animated: true)
self.locationManager.stopUpdatingLocation()
}
func locationManager(manager: CLLocationManager, didFailWithError error: NSError) {
print("Error:" + error.localizedDescription)
}
}

Answer 1

The only reason why it would be returning a found nil error on a property would be because the property had not yet been instantiated. Given that you're using an IBOutlet, I imagine that you haven't hooked the property to the map view in your storyboard.
See Swift: "mapView.showUserLocation = true" returns "fatal error: unexpectedly found nil while unwrapping an Optional value (lldb) " for more info.

Answer 2

Try to add locationManager.requestLocation() instead of self.mapView.showsUserLocation = true
Check if your info.plist contains 'Privacy - Location Usage Description'