sockets - Swift: How to update UI when listening to a stream -


code below seems work, except can't seem update button after getting stream event.

i've tried both delegate , dispatch_async , neither seem trick.

what magic missing here?

import uikit  class testviewcontroller: uiviewcontroller {      @iboutlet weak var connectbutton: uibarbuttonitem!     @iboutlet weak var stopbutton: uibarbuttonitem!      let socket = socket()      override func viewdidload() {         super.viewdidload()     }      override func didreceivememorywarning() {         super.didreceivememorywarning()     }      @ibaction func connectserver(sender: uibarbuttonitem) {         socket.connect("10.0.0.1", port: 12345)     }      func setstopbuttonstate(state: string) {         switch state {         case "go":             stopbutton?.title = "stop"             break         case "stop":             stopbutton?.title = "start"             break         default:             break         }     } }  class socket: nsobject, nsstreamdelegate {     var inputstream: nsinputstream?     var outputstream: nsoutputstream?      func connect(host: string, port: int) {         nsstream.getstreamstohostwithname(host, port: port, inputstream: &inputstream, outputstream: &outputstream)         if inputstream != nil && outputstream != nil {             inputstream!.delegate = self             outputstream!.delegate = self             inputstream!.scheduleinrunloop(.mainrunloop(), formode: nsdefaultrunloopmode)             outputstream!.scheduleinrunloop(.mainrunloop(), formode: nsdefaultrunloopmode)             inputstream!.open()             outputstream!.open()         }     }      func stream(astream: nsstream, handleevent eventcode: nsstreamevent) {         if astream === inputstream {             switch eventcode {             case nsstreamevent.hasbytesavailable:                 var inputbuffer = array<uint8>(count:2048, repeatedvalue: 0)                 inputstream?.read(&inputbuffer, maxlength: 2048)                 testviewcontroller().setstopbuttonstate(string(bytes: inputbuffer, encoding: nsutf8stringencoding)!)                 break             default:                 break             }         }     } }

let socket have callback , , call when stream have bytes :

import uikit  class testviewcontroller: uiviewcontroller {  @iboutlet weak var connectbutton: uibarbuttonitem! @iboutlet weak var stopbutton: uibarbuttonitem!  let socket = socket()  override func viewdidload() {     super.viewdidload() }  override func didreceivememorywarning() {     super.didreceivememorywarning() }  @ibaction func connectserver(sender: uibarbuttonitem) {     socket.connect("10.0.0.1", port: 12345)     socket.changewhenhasbytesavailable = { str in         // change string     } }  func setstopbuttonstate(state: string) {     switch state {     case "go":         stopbutton?.title = "stop"         break     case "stop":         stopbutton?.title = "start"         break     default:         break     } } }  class socket: nsobject, nsstreamdelegate { var inputstream: nsinputstream? var outputstream: nsoutputstream? var changewhenhasbytesavailable: ((string)->())?  func connect(host: string, port: int) {     nsstream.getstreamstohostwithname(host, port: port, inputstream: &inputstream, outputstream: &outputstream)     if inputstream != nil && outputstream != nil {         inputstream!.delegate = self         outputstream!.delegate = self         inputstream!.scheduleinrunloop(.mainrunloop(), formode: nsdefaultrunloopmode)         outputstream!.scheduleinrunloop(.mainrunloop(), formode: nsdefaultrunloopmode)         inputstream!.open()         outputstream!.open()     } }  func stream(astream: nsstream, handleevent eventcode: nsstreamevent) {     if astream === inputstream {         switch eventcode {         case nsstreamevent.hasbytesavailable:             var inputbuffer = array<uint8>(count:2048, repeatedvalue: 0)             inputstream?.read(&inputbuffer, maxlength: 2048)             //call in main queue             dispatch_async(dispatch_get_main_queue(), {                  self.changewhenhasbytesavailable?(string(bytes: inputbuffer, encoding: nsutf8stringencoding)!)             })             break         default:             break         }     } } }

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