how to know when startUpdatingLocation is finished

Hi, I want to update labels and start using functions according to the country the user is located in, and I use the method startUpdatingLocation. But I have noticed that I use my functions too soon before the localization is completed. So some of my input parameters are empty, and so the function returns nothing.

Here's my code : override func viewDidLoad() { super.viewDidLoad() ... locationManager.startUpdatingLocation()

    //*** some parsings

.... let Fruits = CatalogueDesFruits.listeFruits (jsonFruitsResult, dictionnaireDesPays: jsonPaysResult, pays: monPaysISO, mois: 0) println("--") println(Fruits) println("--") ... }

func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!) { CLGeocoder().reverseGeocodeLocation(manager.location, completionHandler: {(placemarks, error) -> Void in

        // Il y a une erreur dans la récupération des coordonnées
        if error != nil {
            println("Error :" + error.localizedDescription)
            return
        }

        // Récupération de l'endroit en fonction de la localisation
        if placemarks.count > 0 {
            // Dans le CLPlacemark il y a aussi le PAYS !!
            let pm = placemarks[0] as! CLPlacemark
            // On affiche les informations sur l'endroit
            self.displayLocationInfo(pm)
        }
        else {
            println("Error with data")
        }
    })
}

//************************************************************************** func displayLocationInfo (pm: CLPlacemark) { // On arrête le rafraichissement de la position self.locationManager.stopUpdatingLocation()

    // On affiche les infos sur la localisation
    self.pays.text = pm.country
    self.ville.text = pm.locality

    // On initialise le nom Anglais du pays
    self.monPaysISO = pm.ISOcountryCode
}

my list "Fruits" is empty, because parameter "monPaysISO" is not updated before the call of CatalogueDesFruits.listeFruits function.

How can I be sure that self.monPaysISO is updated THEN I can call CatalogueDesFruits.listeFruits function ?

Thank you,