本文基于：高德地图路径绘制进行了路径绘制的优化，添加了根据交通信息（是否拥堵）来显示路况，效果如图：

图标资源：

custtexture_bad

custtexture_green

custtexture_slow

custtexture_serious

设置覆盖物

swift">    //路径搜索结果
    func onRouteSearchDone(_ request: AMapRouteSearchBaseRequest!, response: AMapRouteSearchResponse!) {

        // 取出第一种路线方案
        let stringWithOptional = response.route.paths.first?.polyline!
        let distance=response.route.paths.first?.distance
        let time=response.route.paths.first?.duration
        let steps=response.route.paths.first?.steps
        //遍历导航路段 AMapStep 数组
        for step in steps! {
            //遍历路况信息数组
            for tmcs in step.tmcs{
                let result = convertToArray(step.polyline)
                if var temp = result {
                    let polyline = MAPolyline.init(coordinates: &temp, count: UInt(temp.count))
                    //设置路况状态描述为标题：0 未知，1 畅通，2 缓行，3 拥堵，4 严重拥堵
                    polyline?.title=tmcs.status
                    mapView.add(polyline)
                    overlays.append(polyline!)
                }
            }
        }
        //添加动画效果
        mapView.showOverlays(overlays, edgePadding: UIEdgeInsets(top: 20, left: 20, bottom: 20, right: 20), animated: true)
        print("距离：\(distance!)米，预计耗时：\(time!)秒")
    }

设置图标资源

swift">    //路径绘制代理
    func mapView(_ mapView: MAMapView!, rendererFor overlay: MAOverlay!) -> MAOverlayRenderer! {
        if overlay is MAPolyline {
            let polygonView = MAPolylineRenderer.init(polyline: (overlay as! MAPolyline))
            // 参数设置
            let title=overlay.title
            polygonView?.lineWidth = 20.0
            switch title {
            case "缓行":
                polygonView?.strokeImage=UIImage.init(resource: ImageResource.custtextureSlow)
                break
            case "拥堵":
                polygonView?.strokeImage=UIImage.init(resource: ImageResource.custtextureBad)
                break
            case "严重拥堵":
                polygonView?.strokeImage=UIImage.init(resource: ImageResource.custtextureSerious)
                break
            default://缓行、畅通
                polygonView?.strokeImage=UIImage.init(resource: ImageResource.custtextureGreen)
            }
          return polygonView
        }
        return nil
    }