How open file.gpx in myApp

I looked at Stanford University tutorial lesson 14.

but if I want to open a file.gpx in folder project loaded, I can not see in MapView.

This is the code:

func dataBaseURL()->NSURL {
        let fileManager = NSFileManager.defaultManager()
        let fileName = "Location01.gpx"
        let urls = fileManager.URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)
        let bundleURL = NSBundle.mainBundle().URLForResource("Location01", withExtension: "gpx")
        var finalDatabaseURL:NSURL?

        if let documentDirectory:NSURL = urls.first {
            finalDatabaseURL = documentDirectory.URLByAppendingPathComponent(fileName)
            if (finalDatabaseURL?.checkResourceIsReachableAndReturnError(nil) != nil) {
                return finalDatabaseURL!
            } else {
                do {
                    try fileManager.copyItemAtURL(bundleURL!, toURL: finalDatabaseURL!)
                }
                catch let error as NSError {
                    /
                    print("Couldn't create temp file from: \(bundleURL) at: \(finalDatabaseURL) error: \(error.localizedDescription).")
                    print("Error\nCode: \(error.code)\nDomain: \(error.domain)\nDescription: \(error.localizedDescription)\nReason: \(error.localizedFailureReason)\nUser Info: \(error.userInfo)\n")
                }
             
                /
            }
        }
       return finalDatabaseURL!
    }

override func viewDidLoad() {
        super.viewDidLoad()
        let center = NSNotificationCenter.defaultCenter()
        let queue = NSOperationQueue.mainQueue()
        let appDelegate = UIApplication.sharedApplication().delegate
      
        center.addObserverForName(GPXURL.Notification, object: appDelegate, queue: queue) {
            notification in if let url = notification.userInfo?[GPXURL.Key] as? NSURL {
                self.gpxURL = url
            }
        }
       gpxURL = dataBaseURL()
    }

var gpxURL: NSURL? {
        didSet {
            clearWaypoints()
            if let url = gpxURL {
                GPX.parse(url) {
                    if let gpx = $0 { self.handleWaypoints(gpx.waypoints)}
                }
            }
        }
    }
   
    private func clearWaypoints() {
        if mapView?.annotations != nil {mapView.removeAnnotations(mapView.annotations as [MKAnnotation])}
    }
   
    private func handleWaypoints(waypoints:[GPX.Waypoint]) {
        mapView.addAnnotations(waypoints)
        mapView.showAnnotations(waypoints, animated: true)
    }