Question

我想知道两个坐标之间的所有可能路线，谷歌地图api只给我一条路线，使用这个网址：＆＃34; https://maps.googleapis.com/maps/api/directions/json?origin=30.1124,31.4003&destination=29.9792,31.1342&provideRouteAlternatives=true&key=xx＆＃34;）

我无法找到所有路线的位置并获取它们

这是代码

func getRoutes(handler:@escaping (_ error: String?) -> Void){
let request = URLRequest(url: URL(string:   "https://maps.googleapis.com/maps/api/directions/json?origin=30.1124,31.4003&destination=29.9792,31.1342&provideRouteAlternatives=true&key=AIzaSyAf5emsTReEhPgC3NwAnXEdoa_CllLbyLc")!)

 //   request.addValue("provideRouteAlternatives", forHTTPHeaderField: "true")

    let session = URLSession.shared
    let task = session.dataTask(with: request) { data, response, error in
        if error != nil {
            // Handle error...
            handler("Connection Error")
            return
        }
        let parsedResult: [String: AnyObject]!
        do {
            parsedResult = try JSONSerialization.jsonObject(with: data!, options: .allowFragments) as? [String: AnyObject]
            print(parsedResult)
        } catch {
            print("Error parsing result as JSON")
            handler("Cant download Student data")
            return
        }

        if let array = parsedResult["routes"] as? NSArray {
            if let routes = array[0] as? NSDictionary{
                if let overview_polyline = routes["overview_polyline"] as? NSDictionary{
                    if let points = overview_polyline["points"] as? String{
                        print(points)
                        // Use DispatchQueue.main for main thread for handling UI
                        DispatchQueue.main.async {
                            // show polyline
                            let path = GMSPath(fromEncodedPath:points)
                            let polyline = GMSPolyline(path: path)
                            //self.polyline.path = path
                            polyline.strokeWidth = 4
                            polyline.map = self.myMap
                        }
                    }
                }
            }
        }

        handler(nil)

    }
      task.resume()
}

Answer 1

所有路由都出现在JSON响应中的 routes 数组中。

如果您指定了特定的 origin 和 destination ，我会在API响应中的 routes 数组中只看到一个元素。但 https://www.google.co.in/maps/dir/'30.1124,31.4003'/'29.9792,31.1342'/ 会在网络版上显示多条路线。

除非Google在JSON响应中提供所有路线，否则您的程序中可能无法执行任何操作。

如何使用谷歌地图api获得所有可能的路线

1 个答案: