如何在watchOS WKInterfaceMap上绘制多段线？

import WatchKit
import Foundation
import MapKit

class InterfaceController: WKInterfaceController, MKMapViewDelegate {
    
    @IBOutlet weak var map: WKInterfaceMap!
    
    override func awake(withContext context: Any?) {
        super.awake(withContext: context)
        
        // 设置WKInterfaceMap的代理
        map.delegate = self
        
        // 创建多段线对象
        let coordinates = [
            CLLocationCoordinate2D(latitude: 37.331686, longitude: -122.030656),
            CLLocationCoordinate2D(latitude: 37.332686, longitude: -122.031656),
            CLLocationCoordinate2D(latitude: 37.333686, longitude: -122.032656)
        ]
        let polyline = MKPolyline(coordinates: coordinates, count: coordinates.count)
        
        // 创建多段线渲染器
        let renderer = MKPolylineRenderer(polyline: polyline)
        renderer.strokeColor = UIColor.red
        renderer.lineWidth = 2.0
        
        // 将多段线渲染器添加到WKInterfaceMap上
        map.addOverlay(polyline)
    }
    
    // MKMapViewDelegate方法，用于渲染多段线
    func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer {
        if overlay is MKPolyline {
            return MKPolylineRenderer(overlay: overlay)
        }
        return MKOverlayRenderer()
    }
}