SWIFT：谷歌地图绘制航点折线

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...而是只使用公共道路。这是我的一些绘制直线的代码，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

在 Swift 3 中在 GoogleMap 上的两个标记之间绘制折线。

// Pass your source and destination coordinates in this method.
func getPolylineRoute(from source: CLLocationCoordinate2D, to destination: CLLocationCoordinate2D){
    
    let config = URLSessionConfiguration.default
    let session = URLSession(configuration: config)
    
    let url = URL(string: "http://maps.googleapis.com/maps/api/directions/json?origin=\(source.latitude),\(source.longitude)&destination=\(destination.latitude),\(destination.longitude)&sensor=false&mode=driving")!
    
    let task = session.dataTask(with: url, completionHandler: {
        (data, response, error) in
        
        guard error == nil else {
            print(error!.localizedDescription) // Handle error here
            return
        }
        
        do {
            guard let json = try JSONSerialization.jsonObject(with: data!, options: .allowFragments) as? [String: Any] else {
                return
            }
            guard let routes = json["routes"] as? [Any] else { return }
            guard !routes.isEmpty else { return }
            guard let overview_polyline = routes[0] as? [String: Any] else { return }
            guard let polyString = overview_polyline["points"] as? String else { return }
            
            //Call this below method to draw path on map
            self.showPath(polyStr: polyString!)
            
        }catch{
            print("error in JSONSerialization \(error)")
        }
    })
    task.resume()
}

在地图上绘制折线。

func showPath(polyStr :String){
    let path = GMSPath(fromEncodedPath: polyStr)
    let polyline = GMSPolyline(path: path)
    polyline.strokeWidth = 3.0
    polyline.map = mapView // Your map view
}