SWIFT:谷歌地图绘制航路点折线

Question

您好，我想知道是否有一种方法可以在谷歌地图 iOS 中的两个或多个标记之间绘制航路点。我不想画直线...但只使用公共(public)道路。这是我绘制直线的一些代码，但这不是我想要的。

    @objc private func makeGpsPath(){
    for i in 0 ..< trailArr.count {
        path.add(trailArr[i])
    }
    let polyline = GMSPolyline(path: path)
    polyline.strokeWidth = 5.0
    polyline.strokeColor = UIColor.black
    polyline.map = mapViewContainer
}

Answer 1

要在两点或更多点之间绘制折线，您应该使用谷歌地图请求阅读此链接 https://developers.google.com/maps/documentation/directions/intro#Waypoints就我而言，我做到了

    func drawRoute() {
    ServerCommunicator.getDotsToDrawRoute(positions: positions, completion: { path in
        self.route.countRouteDistance(p: path)
        self.polyline.path = path
        self.polyline.strokeColor = UserSession.tintColor
        self.polyline.strokeWidth = 4.0
        self.polyline.map = self._mapView
    })
}

还有请求的部分

static func getDotsToDrawRoute(positions : [CLLocationCoordinate2D], completion: @escaping(_ path : GMSPath) -> Void) {
    if positions.count > 1 {
        let origin = positions.first
        let destination = positions.last
        var wayPoints = ""
        for point in positions {
            wayPoints = wayPoints.characters.count == 0 ? "\(point.latitude),\(point.longitude)" : "\(wayPoints)|\(point.latitude),\(point.longitude)"
        }
        let request = "https://maps.googleapis.com/maps/api/directions/json"
        let parameters : [String : String] = ["origin" : "\(origin!.latitude),\(origin!.longitude)", "destination" : "\(destination!.latitude),\(destination!.longitude)", "wayPoints" : wayPoints, "key" : googleAPI_KEY]
        Alamofire.request(request, method:.get, parameters : parameters).responseJSON(completionHandler: { response in
            guard let dictionary = response.result.value as? [String : AnyObject]
                else {
                    return
            }
            if let routes = dictionary["routes"] as? [[String : AnyObject]] {
                if routes.count > 0 {
                    var first = routes.first
                    if let legs = first!["legs"] as? [[String : AnyObject]] {
                        let fullPath : GMSMutablePath = GMSMutablePath()
                        for leg in legs {
                            if let steps = leg["steps"] as? [[String : AnyObject]] {
                                for step in steps {
                                    if let polyline = step["polyline"] as? [String : AnyObject] {
                                        if let points = polyline["points"] as? String {
                                            fullPath.appendPath(GMSMutablePath(fromEncodedPath: points))
                                        }
                                    }
                                }
                                completion(path: fullPath)
                            }
                        }
                    }
                }
            }
        })
    }
}
extension GMSMutablePath {

func appendPath(path : GMSPath?) {
    if let path = path {
        for i in 0..<path.count() {
            self.add(path.coordinate(at: i))
        }
    }
}