在mapView中为CLLocation数组绘制路由(Swift)

import MapKit

class ViewController: UIViewController {
    @IBOutlet weak var mapView: MKMapView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 创建CLLocation数组
        let locations: [CLLocation] = [
            CLLocation(latitude: 37.7749, longitude: -122.4194),
            CLLocation(latitude: 34.0522, longitude: -118.2437),
            CLLocation(latitude: 32.7157, longitude: -117.1611)
        ]
        
        // 将CLLocation数组中的坐标点转换为MKPlacemark对象
        var coordinates = locations.map { $0.coordinate }
        let polyline = MKPolyline(coordinates: &coordinates, count: coordinates.count)
        
        // 添加MKPolyline对象到地图上
        mapView.addOverlay(polyline)
        
        // 设置地图显示区域
        let region = MKCoordinateRegion(center: locations[0].coordinate, latitudinalMeters: 1000000, longitudinalMeters: 1000000)
        mapView.setRegion(region, animated: true)
    }
}

extension ViewController: MKMapViewDelegate {
    func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer {
        if let polyline = overlay as? MKPolyline {
            let renderer = MKPolylineRenderer(polyline: polyline)
            renderer.strokeColor = UIColor.blue
            renderer.lineWidth = 3
            return renderer
        }
        return MKOverlayRenderer()
    }
}