ios - MPMoviePlayerController Black Screen when called in shared session -

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i have playvideo() method in here: 

func playvideo() {     let url = nsurl(string: "http://mtc.cdn.vine.co/r/videos_r2/20660994a41184015287536758784_sw_webm_14252654515363566800065.mp4?versionid=x5uve9shovypw7z7.vneppyihefx_uwj")      //let url = nsurl(string: videourls[videonumber])     //println(videourls[videonumber])     movieplayer = mpmovieplayercontroller(contenturl: url)     if let player = movieplayer {         player.view.frame = cgrect(x: 0, y: 0, width: 300, height: 300)         player.view.center = self.view.center         player.preparetoplay()         player.scalingmode = .aspectfill         player.controlstyle = .none         self.view.addsubview(player.view)          player.play()     } }

when directly call viewdidload works without problem. when tried call in shared session that:

     var task = nsurlsession.sharedsession().datataskwithurl(url!, completionhandler: { data,response,error  -> void in          if(error == nil)         {             var err :nserror?             var jsonresult : nsdictionary = nsjsonserialization.jsonobjectwithdata(data, options: nsjsonreadingoptions.mutablecontainers, error: &err) nsdictionary!             var records: nsarray = (jsonresult["data"]?["records"]) nsarray             for(var i=0;i<records.count;i++)             {                 var strvideo = (records[i]["videolowurl"] string);                 videourls.append(strvideo)             }         }         else         {             println("error")         }     })     task.resume()

it shows black screen , there no sound or nothing else.

i know calls playvideo() method not work right.

what problem ?

this top of head completion handler not called on main thread. ui stuff must done on main thread.

dispatch main queue using:

dispatch_async(dispatch_get_main_queue()) {     self.playvideo() }

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