MapBox iOS:如何访问管线坐标以使用多段线进行绘制

import Mapbox

class ViewController: UIViewController {
    var mapView: MGLMapView!

    override func viewDidLoad() {
        super.viewDidLoad()

        mapView = MGLMapView(frame: view.bounds)
        mapView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
        mapView.styleURL = MGLStyle.streetsStyleURL
        mapView.delegate = self

        view.addSubview(mapView)
    }
}

func addPolyline() {
    // 创建坐标点数组
    let coordinates = [
        CLLocationCoordinate2D(latitude: 37.7749, longitude: -122.4194),
        CLLocationCoordinate2D(latitude: 37.7749, longitude: -122.4312),
        CLLocationCoordinate2D(latitude: 37.7833, longitude: -122.4312),
        CLLocationCoordinate2D(latitude: 37.7833, longitude: -122.4194)
    ]

    // 创建多段线特征
    let polylineFeature = MGLPolylineFeature(coordinates: coordinates, count: UInt(coordinates.count))

    // 创建形状源
    let shapeSource = MGLShapeSource(identifier: "polyline", features: [polylineFeature], options: nil)

    // 将形状源添加到地图样式中
    mapView.style?.addSource(shapeSource)

    // 创建多段线图层
    let polylineLayer = MGLLineStyleLayer(identifier: "polyline-layer", source: shapeSource)

    // 设置多段线的样式
    polylineLayer.lineColor = NSExpression(forConstantValue: UIColor.red)
    polylineLayer.lineWidth = NSExpression(forConstantValue: 2)

    // 将多段线图层添加到地图样式中
    mapView.style?.addLayer(polylineLayer)
}

override func viewDidLoad() {
    super.viewDidLoad()

    // ...

    addPolyline()
}