Swift 3，NS Generic Exception - NSArrayM在枚举时发生了变异

Question

错误：

  

2017-07-13 16：02：03.635000 bihamkapp [1461：1448858] *终止应用   由于未捕获的异常'NSGenericException'，原因：'*   集合＆lt; __ NSArrayM：0x17005f680＆gt;在被诅咒时发生了变异   列举“。   ***首先抛出调用堆栈：（0x1820b91b8 0x180af055c 0x1820b8c00 0x100176584 0x100176030 0x18c1fb934 0x1001484bc 0x101103ae4   0x18530ef24 0x18530edd0 0x182326094 0x18204ee50 0x182067218   0x1820669cc 0x1820644b0 0x181f922b8 0x183a46198 0x187fd97fc   0x187fd4534 0x10007dfac 0x180f755b8）libc ++ abi.dylib：终止于   NSException（lldb）

类型的未捕获异常

代码：

func callWS(){
        let  url = URL(string: "some url")

        let config = URLSessionConfiguration.default
        let session = URLSession(configuration: config)  

        let task = session.dataTask(with: url!, completionHandler: {

            (data, response, error) in

            if error != nil
            {
                print("Error")
            }
            else
            {
                if let content = data
                {
                    do
                    {
                        let myJSON = try JSONSerialization.jsonObject(with: content, options: JSONSerialization.ReadingOptions.mutableContainers) as? [[String:AnyObject]]

                        self.myCopyJSON = myJSON!

                        for post in self.myCopyJSON {

                            var icon = post["type"]

                            if let checkNull = post["type"] as? NSDictionary {
                                print(checkNull)
                            }
                            else{
                                let tipRadara:Int = icon as! Int

                                switch tipRadara
                                {
                                case 1:
                                    icon = "radar_stacionarni" as AnyObject
                                case 2:
                                    icon = "radar_najavljeni" as AnyObject
                                default:
                                    icon = "" as AnyObject
                                }

                                let title = post["title"]
                                let coordinates = post["coordinates"]
                                let text = post["text"]

                                if((coordinates?.length)! > 0 && (title?.length)! > 0 && (icon?.length)! > 0){
                                    let coord_2 = coordinates?.components(separatedBy: ",")

                                    let coord_1_part: String = coord_2![0]
                                    let coord_2_part: String = coord_2![1]

                                    var stanjeMarker: NMAMapMarker?

                                    let coordinates: NMAGeoCoordinates = NMAGeoCoordinates(latitude: Double(coord_1_part)!, longitude: Double(coord_2_part)!)
                                    stanjeMarker = NMAMapMarker(geoCoordinates: coordinates)

                                    let pdfImageIcon: UIImage = UIImage.imageWithPDFNamed(icon as! String, fitSize: CGSize(width:100, height:100))!
                                    stanjeMarker?.icon = pdfImageIcon
                                    stanjeMarker?.title = title as! String
                                    stanjeMarker?.textDescription = text as! String
                                    self.mapView.add(stanjeMarker!)

                                }
                                else {
                                    print("else length > 0")
                                }
                            }
                        }
                    }
                    catch {                     
                    }
                }
            }
        })      
        task.resume()
    }

override func viewDidLoad() { 
    super.viewDidLoad() 
    mapView.useHighResolutionMap = true 
    mapView.zoomLevel = 7 
    mapView.set(geoCenter: NMAGeoCoordinates(latitude: 43.915886, longitude: 17.67907600000001), animation: .none) 
    mapView.copyrightLogoPosition = NMALayoutPosition.bottomCenter 
    self.mapView.delegate = self 
    callWS() 
}