segmentedControl.addTarget(self, action: "mapTypeChanged:", for: .valueChanged)

    func mapTypeChanged(_ sender: UISegmentedControl) {
        switch sender.selectedSegmentIndex {
        case 0:
            mapView.mapType = .standard
        case 1:
            mapView.mapType = .hybrid
        case 2:
            mapView.mapType = .satellite
        case _:
            break
        }
    }

}