override func viewDidLoad() {
    super.viewDidLoad()

    //Setting up the Location Manager.
    locationManager.delegate = self
    locationManager.desiredAccuracy = kCLLocationAccuracyBest
    locationManager.requestWhenInUseAuthorization()
    locationManager.startUpdatingLocation()

    //Showing user location on the map as a blue dot.
    self.theMap.showsUserLocation = true

    //Setting the delegate for the map view.
    self.theMap.delegate = self
}


func locationManager(manager: CLLocationManager, didUpdateLocations    locations: [CLLocation]) {

    //Getting the last recorded location.
    let location = locations.last
    let ceter = CLLocationCoordinate2D(latitude:   (location?.coordinate.latitude)!, longitude: (location?.coordinate.longitude)!)

    //Setting the region of the map.
    let region = MKCoordinateRegion(center: ceter, span: MKCoordinateSpanMake(0.01, 0.01))

    //Assigning the region to the map.
    self.theMap.setRegion(region, animated: true)

    //Stop updating the location.
    self.locationManager.stopUpdatingLocation()

}


func mapView(mapView: MKMapView, regionDidChangeAnimated animated: Bool) {
    //Getting the center coordinate of the screen.
    let thecenter = mapView.centerCoordinate

    //Storing latitude & longitude in seperate variables.
    let centerLat = thecenter.latitude
    let centerlon = thecenter.longitude

    //Converting CLLocationCoordinate2D to CLLocation.
    let movedMap: CLLocation = CLLocation(latitude: centerLat, longitude: centerlon)

    //Performing Reverse GeoCoding to retrieve address from Coordinates.
    CLGeocoder().reverseGeocodeLocation(movedMap) { (placemarks, error) -> Void in

        //Checking for error.
        if(error != nil) {
            print(error)
        }else{

            //Taking the first coordinates among the lot & storing in variable 'p'.
            if let p = placemarks?.last {

                //Unwrapping Optional Strings.
                let roadno = p.subThoroughfare ?? ""

                //Checking if subThoroughfare exists.
                if(p.subThoroughfare != nil) {

                    //Unwrapping Optional Strings.
                    let thoroughfare = p.thoroughfare ?? ""
                    let subLocality = p.subLocality ?? ""
                    let locality = p.locality ?? ""
                    let administrativeArea = p.administrativeArea ?? ""
                    let postalCode = p.postalCode ?? ""
                    let country = p.country ?? ""

                    let address = " (roadno) r (thoroughfare) r (subLocality) r (locality) (administrativeArea) (postalCode) r (country)"
                    print(address)

                   //Assigning the address to the address label on the map.
                   self.addressLabel.text = " (roadno) r (thoroughfare) r (subLocality) r (locality) (administrativeArea) (postalCode) r (country)"

                }else{

                    //Unwrapping Optional Strings.
                    let thoroughfare = p.thoroughfare ?? ""
                    let subLocality = p.subLocality ?? ""
                    let locality = p.locality ?? ""
                    let administrativeArea = p.administrativeArea ?? ""
                    let postalCode = p.postalCode ?? ""
                    let country = p.country ?? ""

                    let address = " (roadno) r (thoroughfare) r (subLocality) r (locality) (administrativeArea) (postalCode) r (country)"

                    print(address)
                    //Assigning the address to the address label on the map.
                    self.addressLabel.text = " (thoroughfare) r (subLocality) r (locality) (administrativeArea) (postalCode) r (country)"
                }
            }
        }
    }
}

override func viewDidLoad() {
    super.viewDidLoad()

    let coordinate:CLLocationCoordinate2D = CLLocationCoordinate2D(latitude: 0, longitude: 0)
    let span = MKCoordinateSpanMake(100, 80)
    let region = MKCoordinateRegionMake(coordinate, span)
    self.theMap.setRegion(region, animated: true)


    //Setting up the Location Manager.
    locationManager.delegate = self
    locationManager.desiredAccuracy = kCLLocationAccuracyBest
    locationManager.requestWhenInUseAuthorization()
    locationManager.startUpdatingLocation()

    //Showing user location on the map as a blue dot.
    self.theMap.showsUserLocation = true

    //Setting the delegate for the map view.
    self.theMap.delegate = self

}