MapKit Overlay Swift Issue - ios

Question

I am currently not able to clear the overlay.I would like to clear my overlay that was traveled and then start again. I have looked at a ton of different lines of code and can't seem to figure it out. Could you please help me out on this? I am new to Swift so please play nice :)
import UIKit
import CoreLocation
import MapKit
class ViewController: UIViewController, CLLocationManagerDelegate, MKMapViewDelegate {
#IBOutlet weak var theMap: MKMapView!
#IBOutlet weak var theLabel: UILabel!
#IBOutlet weak var startTracking: UIButton!
#IBOutlet weak var stopTracking: UIButton!
#IBOutlet weak var clearTrack: UIButton!
var polyline:MKPolyline = MKPolyline()
var manager:CLLocationManager!
var myLocations: [CLLocation] = []
func clearTrack(sender: UIButton){
//label.text = String(myLocations.count)
//stopTracking()
theMap.removeOverlay (polyline)
}
func stopTracking(sender: UIButton) {
manager.stopUpdatingLocation()
myLocations = []
println("Stop making a line")
}
func startTracking(sender: UIButton) {
manager.startUpdatingLocation()
myLocations = []
println("Making a line")
}
override func viewDidLoad() {
super.viewDidLoad()
//Setup our Location Manager
manager = CLLocationManager()
manager.delegate = self
manager.desiredAccuracy = kCLLocationAccuracyBest
manager.requestAlwaysAuthorization()
manager.startUpdatingLocation()
//Setup our Map View
theMap.delegate = self
theMap.mapType = MKMapType.Hybrid
theMap.showsUserLocation = true
}
func locationManager(manager:CLLocationManager, didUpdateLocations locations:[AnyObject]) {
theLabel.text = "\(locations[0])"
myLocations.append(locations[0] as CLLocation)
let spanX = 0.002
let spanY = 0.002
var newRegion = MKCoordinateRegion(center: theMap.userLocation.coordinate, span: MKCoordinateSpanMake(spanX, spanY))
theMap.setRegion(newRegion, animated: true)
if (myLocations.count > 1){
var sourceIndex = myLocations.count - 1
var destinationIndex = myLocations.count - 2
let c1 = myLocations[sourceIndex].coordinate
let c2 = myLocations[destinationIndex].coordinate
var a = [c1, c2]
var polyline = MKPolyline(coordinates: &a, count: a.count)
theMap.addOverlay(polyline)
}
}
func mapView(mapView: MKMapView!, rendererForOverlay overlay: MKOverlay!) -> MKOverlayRenderer! {
if overlay is MKPolyline {
var polylineRenderer = MKPolylineRenderer(overlay: overlay)
polylineRenderer.strokeColor = UIColor.yellowColor()
polylineRenderer.lineWidth = 3
return polylineRenderer
}
return nil
}
}

Answer 1

Have you tried using:
func clearTrack(sender: UIButton){
theMap.removeOverlays(theMap.overlays)
}