swift json type data parsing after get data -

i'm developing function receiving json after calling nsurlrequest in swift. having issues accessing different data values subscript after have parsed result.

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the following retrieved json:

{"retcode":100,"retmsg":"success","retdata":{"usn":92,"id":"clipsys@gmail.com","nickname":"ppigimi","profile_image":"..\/upload\/profile\/20150528172839.jpeg","language":"jp","join_channel_nm":"korfolk","cert_key":"696d6fb453dc141e5295e9d8e37b8dd0f1afc8e34ce30b74551ed74a447ac564","cert_flag":"y","join_date":"20150518155650","token":"3ea0a5fec1b55a5a23b5f1dc5c14b040dcd71eea"}} 

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the following code. don't know how values usn , token inside of retdata.

let task = nsurlsession.sharedsession().datataskwithrequest(request) {     data, response, error in      if error != nil {         println("error=\(error)")         return     }      // can print out response object     println("response = \(response)")      // print out response body     let responsestring = nsstring(data: data, encoding: nsutf8stringencoding)     println("responsestring = \(responsestring)")      //let's convert response sent server side script nsdictionary object:      var err: nserror?     var myjson = nsjsonserialization.jsonobjectwithdata(data, options: .mutableleaves, error:&err) as? nsdictionary       if let parsejson = myjson as? [string: anyobject] {         // can access value of first name key         var retcode = parsejson["retcode"] as? int         println("retcode: \(retcode)")          if let retdata = parsejson["retdata"] as? [anyobject] {             data in retdata {                 /**let usn = data["usn"]                  println("usn = \(usn)")**/              }         }          if retcode == 100 {             //nsuserdefaults.standarduserdefaults().setvalue("usn", forkey: string)         }          dispatch_async(dispatch_get_main_queue(), {             var myalert = uialertcontroller(title: "alert", message: "aaaaaa", preferredstyle: uialertcontrollerstyle.alert);              let okaction = uialertaction(title: "ok", style:uialertactionstyle.default) {                 action in                 self.dismissviewcontrolleranimated(true, completion: nil);             }              myalert.addaction(okaction);             self.presentviewcontroller(myalert, animated: true, completion: nil);         });     }     }  task.resume() 

the problem accessing retcode [anyobject]. not array, json object. need cast dictionay, example [string : anyobject].

this means for loop accessing data can following:

if let retdata = parsejson["retdata"] as? [string : anyobject] {     data in retdata {         println("data is: \(data)")         /**let usn = data["usn"]         println("usn = \(usn)")**/     } }