ios - Pass a variable value from an IBAction to an IBOutlet -

ok, new , working through development course. realise if crack 1 long way forwards.

i make post call php file on server , return json data. works. , can print variable

print("firstnamevalue: \(firstnamevalue)") 

i want output value of 1 variable...firstnamevalue text field called textfield.

i new swift , thinking "global variable?". worked want wait response http call complete update text field.

i hope can help. new oop , head bursting.

import uikit   class viewcontroller: uiviewcontroller {      @iboutlet weak var feel: uitextfield!      @ibaction func anxious(sender: anyobject) {            let myurl = nsurl(string: "http://mywebsite.com/jamesbond.php");          let request = nsmutableurlrequest(url:myurl!);          request.httpmethod = "post";// compose query string          let poststring = "firstname=james&lastname=bond";          request.httpbody = poststring.datausingencoding(nsutf8stringencoding);          let task = nsurlsession.sharedsession().datataskwithrequest(request) {             data, response, error in              if error != nil             {                 print("error=\(error)")                 return             }              // can print out response object             print("response = \(response)")              // print out response body             let responsestring = nsstring(data: data!, encoding: nsutf8stringencoding)             print("responsestring = \(responsestring)")              //let's convert response sent server side script nsdictionary object:             {                 let myjson =  try nsjsonserialization.jsonobjectwithdata(data!, options: .mutablecontainers) as? nsdictionary                  if let parsejson = myjson {                      // can access value of first name key                     let firstnamevalue = parsejson["firstname"] as? string                      print("firstnamevalue: \(firstnamevalue)")                    edit::the below 2 lines solved it.                     dispatch_async(dispatch_get_main_queue()) {                     self.textfield.text = firstnamevalue}                   }             } catch {                 print(error)             }         }         task.resume()      }     @iboutlet weak var textfield: uitextfield!         @ibaction func submit(sender: anyobject) {         print("hello")         let = 9         let b = 10         let c = (a*b)         textfield.text="you banana \(c)"      }         override func viewdidload() {         super.viewdidload()         // additional setup after loading view, typically nib.     }      override func didreceivememorywarning() {         super.didreceivememorywarning()         // dispose of resources can recreated.     } 

the text field must updated in completion handler because datataskwithrequest works asynchronously.

this code necessary optional binding checks , runs line update text field on main thread.

...      {    if let myjson =  try nsjsonserialization.jsonobjectwithdata(data!, options: []) as? [string:anyobject],       firstnamevalue = parsejson["firstname"] as? string {          print("firstnamevalue: \(firstnamevalue)")           dispatch_async(dispatch_get_main_queue()) {            self.textfield.text = firstnamevalue          }    } } catch {     print(error) } 

the option .mutablecontainers not needed @ in case.