如何在ios中的Google地图上显示特定路线的实时交通数据

import UIKit
import GoogleMaps

class ViewController: UIViewController {

    @IBOutlet weak var mapView: GMSMapView!

    override func viewDidLoad() {
        super.viewDidLoad()

        // 设置地图的初始位置和缩放级别
        let camera = GMSCameraPosition.camera(withLatitude: 37.7749, longitude: -122.4194, zoom: 12.0)
        mapView.camera = camera

        // 创建特定路线的GMSPolyline对象
        let path = GMSMutablePath()
        path.addLatitude(37.7749, longitude: -122.4194)
        path.addLatitude(37.3352, longitude: -121.8811)
        let polyline = GMSPolyline(path: path)
        polyline.strokeWidth = 5.0
        polyline.strokeColor = UIColor.blue
        polyline.map = mapView

        // 使用Google Directions API获取实时交通数据
        let directionsURL = "https://maps.googleapis.com/maps/api/directions/json?origin=37.7749,-122.4194&destination=37.3352,-121.8811&key=YOUR_API_KEY"
        if let url = URL(string: directionsURL) {
            URLSession.shared.dataTask(with: url) { (data, response, error) in
                if let data = data {
                    // 解析Google Directions API的响应数据
                    // 提取实时交通数据并应用到polyline上
                    DispatchQueue.main.async {
                        // 更新地图上的polyline
                        polyline.map = nil
                        polyline.map = self.mapView
                    }
                }
            }.resume()
        }
    }
}