ios - JSON parsing and returning data in Swift -

i have swift code retrieving , parsing json data web. seems work fine except 1 problem facing right now. tried solve time, have check sources online.

i have created global dictionary "dicofneighbours" return result of parse other class calling "func startconnection".

dicofneighbours stores parsed data till goes out of closing bracket of the: "let task = session.datataskwithrequest(urlrequest) { ... }" after stores nil. , returned result nil well.

i have tried pass "dicofneighbours" variable reference using inout , still returns nil result.

there might solution missed. appreciate , suggestions.

thanks!

    var dicofneighbours = dictionary<string, [int]>()          func startconnection() -> dictionary<string, [int]>{                 let requesturl: nsurl = nsurl(string: "http://www....data.json")!                 let urlrequest: nsmutableurlrequest = nsmutableurlrequest(url: requesturl)                 let session = nsurlsession.sharedsession()                 let task = session.datataskwithrequest(urlrequest) {                     (data, response, error) -> void in                      let httpresponse = response as! nshttpurlresponse                     let statuscode = httpresponse.statuscode                      if (statuscode == 200) {                          do{                              let json = try nsjsonserialization.jsonobjectwithdata(data!, options:.allowfragments)                              if let neighbours = json["neighbours"] as? [string: array<int>] {                                     var = 0                                     (index, value) in neighbours {                                         self.dicofneighbours[index] = value                                  }                              }                          }catch {                             print("error json: \(error)")                          }                                    }                 }                 task.resume() return self.dicofneighbours             } 

you using return instead of using callback. doing parsing when network connection done; asynchronously.

to synchronize it, you'd need use semaphores, highly discouraged on main thread.

instead, appropriate things result when completion block executed. think of data task 'do stuff, come me when you're done'.