在快速的 HTTP 请求中没有得到完整的响应？

Question

我正在使用谷歌路线 API。当我发送请求时，我得到了一半的响应。 这是我的代码：

func getDirections(_ origin: String!, destination: String!, completionHandler: @escaping ((_ status: String, _ success: Bool) -> Void)) {
        if let originLocation = origin {
            if let destinationLocation = destination {
                //var directionsURLString = baseURLDirections + "origin=" + "\(6.935299),\(79.880783)" + "&destination=" + "\(6.909411),\(79.894254)" + "&mode=driving"
                var directionsURLString = "https://maps.googleapis.com/maps/api/directions/json?origin=Chicago,IL&destination=Los+Angeles,CA&waypoints=Joplin,MO|Oklahoma+City,OK&key=YOUR_API_KEY"

                directionsURLString = directionsURLString.addingPercentEscapes(using: String.Encoding.utf8)!

                let directionsURL = URL(string: directionsURLString)

                DispatchQueue.main.async(execute: { () -> Void in
                    let directionsData = try? Data(contentsOf: directionsURL!)

                    var error: NSError?
                    NSLog("json: \(JSON(directionsData!))")



                })
            }
            else {
                NSLog("dest nil:")
                completionHandler("Destination is nil.", false)
            }
        }
        else {
            NSLog("Origin nil:")
            completionHandler("Origin is nil", false)
        }
    }

我得到的回应如下：

"routes" : [
    {
      "bounds" : {
        "northeast" : {
          "lat" : 41.8781139,
          "lng" : -87.6297872
        },
        "southwest" : {
          "lat" : 34.0523559,
          "lng" : -118.2435736
        }
      },
      "summary" : "I-55 S and I-44",
      "warnings" : [

      ],
      "copyrights" : "Map data ©2017 Google, INEGI",
      "waypoint_order" : [
        0,
        1
      ],
      "legs" : [
        {
          "via_waypoint" : [

          ],
          "distance" : {
            "value" : 932596,
            "text" : "579 mi"
          },
          "start_location" : {
            "lat" : 41.8781139,
            "lng" : -87.6297872
          },
          "traffic_speed_entry" : [

          ],
          "start_address" : "Chicago, IL, USA",
          "end_address" : "Joplin, MO, USA",
          "end_location" : {
            "lat" : 37.0842313,
            "lng" : -94.51348499999999
          },
          "duration" : {
            "value" : 30893,

一半没有在控制台打印。这是什么原因？？

Answer 1

这样试试吧！

var session = URLSession()
override init() {
    let configuration = URLSessionConfiguration.default
    session = URLSession(configuration: configuration)
}

func getDirections(_ origin: String!, destination: String!, completionHandler: @escaping ((_ status: String, _ success: Bool) -> Void)) {

    var directionsURLString = "https://maps.googleapis.com/maps/api/directions/json?origin=Chicago,IL&destination=Los+Angeles,CA&waypoints=Joplin,MO|Oklahoma+City,OK&key=YOUR_API_KEY"
    directionsURLString = directionsURLString.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed)!
    let weatherRequestUrl = URL(string: directionsURLString)
    let request = NSMutableURLRequest(url: weatherRequestUrl!)
    let task = session.dataTask(with: request as URLRequest) { (data, response, error) in

        guard error == nil && data != nil else {

            completionHandler("Your message here",false)
            return
        }
        if let httpStatus = response as? HTTPURLResponse{
            if httpStatus.statusCode != 200 {
                print("statusCode should be 200, but is \(httpStatus.statusCode)")
                print("response = \(response)")
            }
        }
        do {
            let dataDictionary = try JSONSerialization.jsonObject(with: data! as Data, options: .allowFragments) as! NSDictionary

            print("Response dictionary is:\(dataDictionary)")
            completionHandler("your message here",false)
        }
        catch let error as NSError {
            print("Error = \(error.localizedDescription)")
            completionHandler("Your message here",false)
        }
    }
    task.resume()
}