Create long press gesture recognizer with annotation pin
<p>What I did so far was create a map. Then show user location and center it so that map is centered when travelling (car etc)</p>

<p>But now I would like to add a long press gesture so that If a user does the input a pin will be dropped. I have struggled with tutorials and the simulator crashes.</p>

<p>How would I add <code>longPressGesturerecognizer</code> so that it drops a pin on my <code>mapView</code>.</p>

<p>Here is my code-</p>

<pre><code>import UIKit
import MapKit
import CoreLocation

class Page2: UIViewController, MKMapViewDelegate,  CLLocationManagerDelegate{

    @IBOutlet var mapView: MKMapView!
    let locationManager = CLLocationManager()

    override func viewDidLoad() {
        super.viewDidLoad()
        self.locationManager.delegate = self
        self.locationManager.desiredAccuracy = kCLLocationAccuracyBest
        self.locationManager.requestWhenInUseAuthorization()
        self.locationManager.startUpdatingLocation()
        //blue dot on the map
        self.mapView.showsUserLocation = true
        //tracking mode on
        self.mapView.userTrackingMode = .follow
    }

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

    // location Manager Delegate center user on map
    private func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!) {

        let location = locations.last
        let center = CLLocationCoordinate2D(latitude: location!.coordinate.latitude, longitude: (location?.coordinate.longitude)!)
        let region = MKCoordinateRegion(center: center, span: MKCoordinateSpan(latitudeDelta: 0.005, longitudeDelta: 0.005)) //zoom on map
        self.mapView.setRegion(region, animated: true)
        self.locationManager.stopUpdatingLocation()
    }

    // print errors
    func locationManager(_ manager: CLLocationManager, didFailWithError error: Error){
        print("Errors: " + error.localizedDescription)
    }
}
</code></pre>