MapView Polygon

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import UIKit
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import Nbmap
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class PolygonViewController: UIViewController {
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    var nbMapView: NGLMapView! {
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        didSet {
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            oldValue?.removeFromSuperview()
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            if let mapView = nbMapView {
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                view.insertSubview(mapView, at: 0)
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            }
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        }
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    }
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    override func viewDidLoad() {
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        super.viewDidLoad()
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        nbMapView = NGLMapView(frame:self.view.bounds)
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        nbMapView.delegate = self
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        drawPolygon()
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    }
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    func drawPolygon(){
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        let locations: [CLLocationCoordinate2D] =  [
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            CLLocationCoordinate2D(latitude: 12.94798778, longitude: 77.57375084),
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            CLLocationCoordinate2D(latitude: 12.93669616, longitude: 77.57385337),
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            CLLocationCoordinate2D(latitude: 12.93639637, longitude: 77.58031279),
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            CLLocationCoordinate2D(latitude: 12.94808770, longitude: 77.58000520)
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        ]
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        if let currentAnnotations = nbMapView.annotations {
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            nbMapView.removeAnnotations(currentAnnotations)
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        }
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        let polygon: NGLPolygon = NGLPolygon.init(coordinates: locations, count: 4)
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        nbMapView.addAnnotation(polygon)
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    }
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}
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extension PolygonViewController: NGLMapViewDelegate {
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    func mapView(_ mapView: NGLMapView, didFinishLoading style: NGLStyle){
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        let camera = NGLMapCamera(lookingAtCenter: CLLocationCoordinate2DMake(12.94798778, 77.57375084),
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                                                                      acrossDistance:10000,
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                                                                               pitch:0,
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                                                                             heading:0)
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        nbMapView.fly(to: camera)
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    }
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    /**
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     Returns the alpha value to use when rendering a shape annotation.
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     A value of `0.0` results in a completely transparent shape. A value of `1.0`,
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     the default, results in a completely opaque shape.
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     This method sets the opacity of an entire shape, inclusive of its stroke and
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     fill. To independently set the values for stroke or fill, specify an alpha
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     component in the color returned by `-mapView:strokeColorForShapeAnnotation:` or
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     `-mapView:fillColorForPolygonAnnotation:`.
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     @param mapView The map view rendering the shape annotation.
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     @param annotation The annotation being rendered.
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     @return An alpha value between `0` and `1.0`.
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     */
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    func mapView(_ mapView: NGLMapView, alphaForShapeAnnotation annotation: NGLShape) -> CGFloat  {
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        return 1.0
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    }
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    /**
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     Returns the color to use when rendering the outline of a shape annotation.
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     The default stroke color is the map view's tint color. If a pattern color is
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     specified, the result is undefined.
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     Opacity may be set by specifying an alpha component. The default alpha value is
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     `1.0` and results in a completely opaque stroke.
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     @param mapView The map view rendering the shape annotation.
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     @param annotation The annotation being rendered.
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     @return A color to use for the shape outline.
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     */
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    func mapView(_ mapView: NGLMapView, strokeColorForShapeAnnotation annotation: NGLShape) -> UIColor  {
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        return UIColor.red
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    }
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    /**
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     Returns the color to use when rendering the fill of a polygon annotation.
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     The default fill color is the map view's tint color. If a pattern color is
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     specified, the result is undefined.
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     Opacity may be set by specifying an alpha component. The default alpha value is
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     `1.0` and results in a completely opaque shape.
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     @param mapView The map view rendering the polygon annotation.
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     @param annotation The annotation being rendered.
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     @return The polygon's interior fill color.
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     */
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    func mapView(_ mapView: NGLMapView, fillColorForPolygonAnnotation annotation: NGLPolygon) -> UIColor  {
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        return UIColor.blue
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    }
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    /**
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     Returns the line width in points to use when rendering the outline of a
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     polyline annotation.
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     By default, the polyline is outlined with a line `3.0` points wide.
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     @param mapView The map view rendering the polygon annotation.
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     @param annotation The annotation being rendered.
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     @return A line width for the polyline, measured in points.
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     */
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    func mapView(_ mapView: NGLMapView, lineWidthForPolylineAnnotation annotation: NGLPolyline) -> CGFloat  {
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        return 3.0
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    }
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    /**
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     Tells the delegate that one of its annotations was selected.
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     You can use this method to track changes in the selection state of annotations.
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     If the annotation is associated with an annotation view, you can also implement
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     `-mapView:didSelectAnnotationView:`, which is called immediately after this
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     method is called.
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     @param mapView The map view containing the annotation.
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     @param annotation The annotation that was selected.
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     */
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    func mapView(_ mapView: NGLMapView, didSelect annotation: NGLAnnotation){
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        let title = (annotation.title ?? "") ?? ""
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        print("didSelect title:" + title)
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        let subtitle = (annotation.subtitle ?? "") ?? ""
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        print("didSelect subtitle:" + subtitle)
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    }
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    /**
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     Tells the delegate that one of its annotations was deselected.
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     You can use this method to track changes in the selection state of annotations.
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     If the annotation is associated with an annotation view, you can also implement
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     `-mapView:didDeselectAnnotationView:`, which is called immediately after this
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     method is called.
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     @param mapView The map view containing the annotation.
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     @param annotation The annotation that was deselected.
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     */
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    func mapView(_ mapView: NGLMapView, didDeselect annotation: NGLAnnotation){
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        let title = (annotation.title ?? "") ?? ""
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        print("didDeselect title:" + title)
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        let subtitle = (annotation.subtitle ?? "") ?? ""
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        print("didDeselect subtitle:" + subtitle)
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    }
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}