有没有办法在mkmapview中将虚线绘制为多段线？

import MapKit

class DashedLineRenderer: MKOverlayRenderer {
    override func draw(_ mapRect: MKMapRect, zoomScale: MKZoomScale, in context: CGContext) {
        guard let polyline = overlay as? MKPolyline else {
            return
        }
        
        let path = CGMutablePath()
        let boundingMapRect = polyline.boundingMapRect
        let startPoint = point(for: polyline.points()[0])
        path.move(to: startPoint)
        
        for i in 1..<polyline.pointCount {
            let point = point(for: polyline.points()[i])
            path.addLine(to: point)
        }
        
        context.addPath(path)
        context.setStrokeColor(UIColor.red.cgColor)
        context.setLineWidth(3 / zoomScale)
        context.setLineDash(phase: 0, lengths: [6 / zoomScale, 6 / zoomScale])
        context.strokePath()
    }
}

// 在使用MKMapView时，将DashedLineRenderer应用到多段线上
let mapView = MKMapView()
let polyline = MKPolyline()
mapView.addOverlay(polyline, level: .aboveRoads)
mapView.delegate = self

extension ViewController: MKMapViewDelegate {
    func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer {
        if overlay is MKPolyline {
            return DashedLineRenderer(overlay: overlay)
        }
        return MKOverlayRenderer(overlay: overlay)
    }
}