ios - using JSON data in SWIFT UI controls -

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i need use data json web service update controls in swift app. can data no problem, can't seem access ui controls within task block , can't json persist out of block. i've searched around , haven't found answer. here's test code. current result value1result has value inside task, nil outside. in advance.

    var jsonresult:nsdictionary!     var value1result:string!      let task = nsurlsession.sharedsession().datataskwithurl(url!) { data, response, error in         var error: nserror?         jsonresult = nsjsonserialization.jsonobjectwithdata(data, options: nsjsonreadingoptions.allowfragments, error: &error)!             as! dictionary<string, anyobject>         println(jsonresult)          if let value1 = jsonresult["value1"] {             println(value1)             value1result = value1 as! string             }         }     task.resume()      self.textview1.text = value1result

you can use asynchronous block update main ui

dispatch_async(dispatch_get_main_queue()) {     //update ui }

with code

let task = nsurlsession.sharedsession().datataskwithurl(url!) { data, response, error in     var error: nserror?     jsonresult = nsjsonserialization.jsonobjectwithdata(data, options: nsjsonreadingoptions.allowfragments, error: &error)!         as! dictionary<string, anyobject>     println(jsonresult)      if let value1 = jsonresult["value1"] {         println(value1)             dispatch_async(dispatch_get_main_queue()) {                 //update ui                 value1result = value1 as! string                 self.yourtextview.text = value1 as! string             }         }     } task.resume()

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