CLLocationManager - fatal error: unexpectedly found nil while unwrapping an Optional value - cllocationmanager

Question

I have a little problem with CLLocationManager. When I click on IBAction "addPlace", the app crash. I don't see the problem, and I don't understand why the app crash.
Thank you in advance for your response.
class Map: UIViewController, CLLocationManagerDelegate {
// Outlets
#IBOutlet weak var mapView: MKMapView!
#IBOutlet weak var BTNAdd: UIButton!
// Variables
var positionManager = CLLocationManager()
var geoCoder : CLGeocoder!
var placemark : CLPlacemark!
var name: String = ""
var address: String = ""
var longitude: String = ""
var latitude: String = ""
// Actions
#IBAction func myPosition(sender: AnyObject) {
positionManager.delegate = self
positionManager.desiredAccuracy = kCLLocationAccuracyBest
positionManager.requestWhenInUseAuthorization()
positionManager.startUpdatingLocation()
mapView.showsUserLocation = true
}
#IBAction func addPlace(sender: AnyObject) {
///////////////////////////////////////
// BUG HERE
///////////////////////////////////////
let locality = String(self.placemark.locality)
let postalCode = String(self.placemark.postalCode)
let administrativeArea = String(self.placemark.administrativeArea)
let country = String(self.placemark.country)
print(locality + postalCode + administrativeArea + country)
///////////////////////////////////////
///////////////////////////////////////
}
// Functions
func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
CLGeocoder().reverseGeocodeLocation(manager.location!, completionHandler: {(placemarks, error)->Void in
if let pm = placemarks?.first {
self.displayLocationInfo(pm)
}
})
}
func displayLocationInfo(placemark: CLPlacemark?) {
if let containsPlacemark = placemark {
positionManager.stopUpdatingLocation()
let locality = (containsPlacemark.locality != nil) ? containsPlacemark.locality : ""
let postalCode = (containsPlacemark.postalCode != nil) ? containsPlacemark.postalCode : ""
let administrativeArea = (containsPlacemark.administrativeArea != nil) ? containsPlacemark.administrativeArea : ""
let country = (containsPlacemark.country != nil) ? containsPlacemark.country : ""
}
}
}

Answer 1

Your placemark variable is declared as an explicitly unwrapped optional, but since you get this error message it's obvious that sometimes this variable will be nil.
Change the declaration to make it a normal Optional, then use if let to ensure safe unwrapping and handle errors:
var placemark : CLPlacemark?
#IBAction func addPlace(sender: AnyObject) {
if let mark = placemark {
let locality = String(self.mark.locality)
let postalCode = String(self.mark.postalCode)
let administrativeArea = String(self.mark.administrativeArea)
let country = String(self.mark.country)
print(locality + postalCode + administrativeArea + country)
} else {
print("placemark was nil")
}
}

Answer 2

I add the variables in class, and fix my IBAction
var locality: String = ""
var postalCode: String = ""
var administrativeArea: String = ""
var country: String = ""
#IBAction func addPlace(sender: AnyObject) {
let locality = self.locality
let postalCode = self.postalCode
let administrativeArea = self.administrativeArea
let country = self.country
print(locality + postalCode + administrativeArea + country)
}