swift - 2 つの注釈ポイントを接続するにはどうすればよいですか?

Question

fromAddress テキスト フィールドと toAddress テキスト フィールドの 2 つの値を渡しました。2 つの注釈ポイントをルートのように接続する必要があります。APIに基づく指示は必要ありません。接続するだけです。

import UIKit
import MapKit
import CoreLocation
import Contacts

class ViewController: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate {

@IBOutlet weak var fromAddress: UITextField!
@IBOutlet weak var toAddress: UITextField!
@IBOutlet weak var map: MKMapView!

let locationManager = CLLocationManager()
var location = CLLocation!.self

@IBAction func getDirection(sender: AnyObject) {

    ConnectingFromAndTo(fromAddress.text!)
    ConnectingFromAndTo(toAddress.text!)
 }


override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.}
}

func ConnectingFromAndTo(address: String){

    CLGeocoder().geocodeAddressString(address, completionHandler:
        {(placemarks, error) in

            if error != nil {
                print("Geocode failed with error: \(error!.localizedDescription)")
            } else if placemarks!.count > 0 {
                let placemark = placemarks![0]
                let location = placemark.location


                let annotation = MKPointAnnotation()
                annotation.coordinate = location!.coordinate
                annotation.title = "\(placemark.locality!)"
                annotation.subtitle = "\(placemark.country!)"
                self.map.addAnnotation(annotation)

                self.map.setRegion(MKCoordinateRegionMake(CLLocationCoordinate2DMake (placemark.location!.coordinate.latitude, placemark.location!.coordinate.longitude), MKCoordinateSpanMake(0.002, 0.002)), animated: true)


            }
    })


}


}