Want to continue displaying current location orientation in Swift MapKit

import UIKit
    import MapKit

    classViewController:UIViewController, CLLocationManagerDelegate{

let manager = CLLocationManager()

@IBOutlet weak varmapView: MKMapView!
override func viewDidLoad(){
    super.viewDidLoad()
    manager.delegate=self

    ifCLLocationManager.authorizationStatus()!=.authorizedWhenInUse{
        manager.requestWhenInUseAuthorization()
    }

    // Follow the position
    mapView.userTrackingMode=MKUserTrackingMode.follow

    // Show current location orientation
    mapView.userTrackingMode=MKUserTrackingMode.followWithHeading

}
funclocationManager(_manager:CLLocationManager, didChangeAuthorization status:CLAuthorizationStatus){
    if status==.authorizedWhenInUse{
        manager.requestLocation()
    }
}
funclocationManager(_manager:CLLocationManager, didUpdateLocations:[CLLocation]){
    print("locations:\(locations)")
    let current=locations[0]
    let region = MKCoordinateRegionMakeWithDistance(current.coordinate,500,500);
    mapView.setRegion(region, animated:true)


}
US>funclocationManager(_manager:CLLocationManager, didFailWithError:Error) {
    print("error=\(error)")
}

override funcdidReceiveMemoryWarning(){
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}
    }