title: CoreAnimation uncommitted CATranaction NSComboBox
body: <p>I am populating an NSComboBox with some data from the function below. After it is populated and I try to scroll through the items I get the CATransaction warning. Can anyone shed some light on why this is happening and what I can do to fix it? I have figured out that it may have something to do with changing the UI of the combobox on a thread other than the main thread but after that I am stuck.</p>
  
  <pre><code>func getAllRecords()
  {
      CATransaction.begin()
      let url = NSURL(string: "http://URL.php")
      let task = NSURLSession.sharedSession().dataTaskWithURL(url!)
          {
              (data, response, error) in
              var d = NSString(data: data, encoding: NSUTF8StringEncoding)
              var arr = d!.componentsSeparatedByString("&lt;") // spliting the incoming string from "&lt;" operator because before that operator is our required data and storing in array
              var dataWeNeed:NSString = arr[0] as! NSString // arr[0] is the data before "&lt;" operator and arr[1] is actually no use for us
              if let data = NSJSONSerialization.JSONObjectWithData(dataWeNeed.dataUsingEncoding(NSUTF8StringEncoding)!, options: NSJSONReadingOptions.MutableContainers, error: nil) as? NSArray
                  {
                      for dd in data
                          {
                              var name : String = dd["Name"]! as! String
                              var email : String = dd["Email"]! as! String
                              //println("Name: \(name)")
                              //println("Email: \(email)")
                              self.userComboBox.addItemsWithObjectValues([name])
                          }
                  }
          }
      task.resume()
      CATransaction.commit()
  }
  </code></pre>
  
  <p>Here is the warning I am getting from the debug area.</p>
  
  <pre><code>2015-06-14 13:54:04.756 Green Time Clock[2150:738395] Unexpected        outstanding background CATransaction
  CoreAnimation: warning, encountered thread with uncommitted     CATransaction; created by:
  0   QuartzCore                          0x00007fff9ab4d6c2     _ZN2CA11Transaction4pushEv + 312
  1   QuartzCore                          0x00007fff9ab689a8   _ZN2CA11Transaction15ensure_implicitEv + 276
  2   QuartzCore                          0x00007fff9ab4d842 _ZN2CA11Transaction9set_valueEj12_CAValueTypePKv + 40
  3   QuartzCore                          0x00007fff9ab4f452 +[CATransaction setDisableActions:] + 38
  4   AppKit                              0x00007fff921a1b8c -[NSView(NSInternal) _updateLayerGeometryFromView] + 389
  5   AppKit                              0x00007fff921c7d09 -[NSView setFrameSize:] + 1129
  6   AppKit                              0x00007fff921c789a -[NSControl setFrameSize:] + 77
  7   AppKit                              0x00007fff922e3891 -[NSTableView setFrameSize:] + 256
  8   AppKit                              0x00007fff922e35f9 -[NSTableView _tileAndRedisplayAll] + 180
  9   Green Time Clock                    0x00000001000042d6 _TFFC16Green_Time_Clock14ViewController13getAllRecordsFS0_FT_T_U_FTGSQCSo6NSData_GSQCSo13NSURLResponse_GSQCSo7NSError__T_ + 2886
  10  Green Time Clock                    0x0000000100004463 _TTRXFo_oGSQCSo6NSData_oGSQCSo13NSURLResponse_oGSQCSo7NSError__dT__XFo_iTGSQS__GSQS0__GSQS1____iT__ + 51
  11  Green Time Clock                    0x0000000100001e31 _TPA__TTRXFo_oGSQCSo6NSData_oGSQCSo13NSURLResponse_oGSQCSo7NSError__dT__XFo_iTGSQS__GSQS0__GSQS1____iT__ + 81
  12  Green Time Clock                    0x0000000100004493 _TTRXFo_iTGSQCSo6NSData_GSQCSo13NSURLResponse_GSQCSo7NSError___iT__XFo_oGSQS__oGSQS0__oGSQS1___dT__ + 35
  13  Green Time Clock                    0x00000001000044fa _TTRXFo_oGSQCSo6NSData_oGSQCSo13NSURLResponse_oGSQCSo7NSError__dT__XFdCb_dGSQS__dGSQS0__dGSQS1___dT__ + 90
  14  CFNetwork                           0x00007fff8c09cba2 __49-[__NSCFLocalSessionTask _task_onqueue_didFinish]_block_invoke + 157
  15  Foundation                          0x00007fff9a75f7e8 __NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 7
  </code></pre>