How to draw user's route in MapView - swift

Question

How i can draw user's route in `mapView?
My map is work, but route is not drawing.
No errors.
For example:
User's route
My code:
class ViewController: UIViewController, CLLocationManagerDelegate, MKMapViewDelegate {
#IBOutlet weak var mapView: MKMapView!
var locationManager: CLLocationManager!
override func viewDidLoad() {
super.viewDidLoad()
locationManager = CLLocationManager()
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.delegate = self
locationManager.requestAlwaysAuthorization()
locationManager.requestWhenInUseAuthorization()
locationManager.startUpdatingLocation()
locationManager.startUpdatingHeading()
mapView.delegate = self
mapView.showsUserLocation = true
mapView.mapType = MKMapType(rawValue: 0)!
mapView.userTrackingMode = MKUserTrackingMode(rawValue: 2)!
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func locationManager(manager: CLLocationManager!, didUpdateToLocation newlocation: CLLocation!, fromLocation oldLocation: CLLocation!) {
print("present location : \(newlocation.coordinate.latitude), \(newlocation.coordinate.longitude)")
if let oldLocationNew = oldLocation as CLLocation?{
let oldCoordinates = oldLocationNew.coordinate
let newCoordinates = newlocation.coordinate
var area = [oldCoordinates, newCoordinates]
var polyline = MKPolyline(coordinates: &area, count: area.count)
mapView.add(polyline)
}
}
func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer {
let pr = MKPolylineRenderer(overlay: overlay)
pr.strokeColor = UIColor.red
pr.lineWidth = 5
return pr
}
}
But it doesn't work.

Answer 1

I asume you used the following delegate to get the last position?
func locationManager(manager: CLLocationManager!,
didUpdateToLocation newlocation: CLLocation!,
fromLocation oldLocation: CLLocation!) {
The delegate above is deprecated in iOS 6. Now the following should be used:
func locationManager(_ manager: CLLocationManager,
didUpdateLocations locations: [CLLocation]) {
In order to get the last position, simply get the last object of the array:
locations.lastObject
Try the following code to draw user's route:
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
guard let newLocation = locations.last else {
return
}
guard let oldLocation = oldLocation else {
// Save old location
self.oldLocation = newLocation
return
}
let oldCoordinates = oldLocation.coordinate
let newCoordinates = newLocation.coordinate
var area = [oldCoordinates, newCoordinates]
let polyline = MKPolyline(coordinates: &area, count: area.count)
mapView.add(polyline)
// Save old location
self.oldLocation = newLocation
}