SwiftyJson Cannot set value

Question

Im using Alamofire to get a table of trucks. Results are handled using SwiftyJSON. One of the columns is the coordinate of each truck.

I would like to compare the trucks coordinate with the users current location. I can already do the calculation. I was thinking of adding the distance calculated into the same JSONObject as a new field with the intention of sorting by distance but I cant seem to set a new value at all.

Setting a json object is not working at all. Below is my code. I commented the part where it doesnt work. I dont get warnings or errors. If i print that out i just get a blank row. Please help. Thanks in advance. Am I doing it right? Any suggestions on how I could best sort the list by distance given the truck coordinates in the results and user location on device?

 Alamofire.request(.POST, Ftf.endPoint(), parameters: params).responseJSON { response in

        if response.result.value != nil{
            let obj = JSON(response.result.value!)
            self.jsonObj = obj
            //ATTEMPT TO SORT THE JSON OBJECT
            print("Begin Sorting Object")
            print("User located at \(self.MyLocation)")

            for (key,subJson):(String, JSON) in self.jsonObj {
                let truckloc = subJson["truckLocation"].stringValue
                print("This truck is at \(truckloc)")

                let coords = truckloc
                var coord = coords.componentsSeparatedByString(",")
                let lat = coord[0]
                let lon = coord[1]
                let truckLocation: CLLocationCoordinate2D = CLLocationCoordinate2DMake((lat as NSString).doubleValue, (lon as NSString).doubleValue)
                let point1 = MKMapPointForCoordinate(self.MyLocation)
                let point2 = MKMapPointForCoordinate(truckLocation)
                let distance = MKMetersBetweenMapPoints(point1, point2)/1000
                let distanceStr = NSString(format: "%.1f", distance)

                print("Distance of truck from user is \(distanceStr)")

                //THIS LINE HERE DOESNT WORK. NO ERROR NO WARNINGS. JUST NOTHING HAPPENS
                self.jsonObj[key]["distance"].string = "\(distanceStr)"


            }

            self.activityIndicator.stopAnimating()
            self.tableView.reloadData()
            self.ftfRefresh.endRefreshing()
        }else{
            self.presentViewController(Ftf.generalAlert("No network connection found"), animated: true, completion: nil)
        }


    }

Answer 1

Try this,

self.jsonObj[key]["distance"] = JSON("\(distanceStr)")

Sample example,

    var json = JSON(["1":"2"])

    print(json)

    json["1"] = JSON("3")

    print(json)