How to make the center of a map your current location only once

import UIKit
import CoreLocation
import MapKit

classViewController:UIViewController, CLLocationManagerDelegate, MKMapViewDelegate{


    @IBOutlet weak var theMap:MKMapView!

    // @IBOutlet weak var theLabel:UILabel!

    varmanager —CLLocationManager!
    var myLocations: CLLocation = [ ]

    override func viewDidLoad(){
        super.viewDidLoad()

        // Setup our Location Manager
        manager = CLLocationManager()
        manager.delegate=self
        manager.desiredAccuracy=kCLLocationAccuracyBest
        manager.requestAlwaysAuthorization()
        manager.startUpdatingLocation()

        // Setup your Map View
        theMap.delegate=self
        theMap.mapType=MKMapType.Standard
        theMap.showsUserLocation=true
    }

    funclocationManager(manager:CLLocationManager, didUpdateLocations:[AnyObject]){
        // theLabel.text="\(locations[0])"
        myLocations.append(locations[0]as!CLLocation)

        letspanX=0.001
        let spanY = 0.001
        var newRegion=MKCoordinateRegion(center:theMap.userLocation.coordinate,span:MKCoordinateSpanMake(spanX,spanY))
        theMap.setRegion(newRegion, animated:true)

        if(myLocations.count>1){
            varsourceIndex=myLocations.count-1
            var destinationIndex=myLocations.count-2

            let c1 = myLocations [sourceIndex].coordinate
            let c2 = myLocations [destinationIndex].coordinate
            vara = [c1, c2]
            var polyline = MK Polyline (coordinates: & a, count: a. count)
            theMap.addOverlay (polyline)

            // theMap.setUserTrackingMode(MKUserTrackingMode.FollowWithHeading, animated:true)
        }
    }

    funcmapView(mapView:MKMapView!, renderForOverlay!) ->MKOverlayRender!{

        if overlay is MKPolyline {
            varpolylineRenderer = MKpolylineRenderer (overlay:overlay)
            polylineRenderer.strokeColor=UIColor.blueColor()
            polylineRenderer.lineWidth=4
            return polylineRender
        }
        return nil
    }
}