CoreAnimation uncommitted CATranaction NSComboBox - xcode

Question

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.
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("<") // spliting the incoming string from "<" 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 "<" 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()
}
Here is the warning I am getting from the debug area.
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

Answer 1

Not sure what root issue is, I found that warning when updating string value to a NSTextView object and resolved it with following code just now.
Just make sure the updating process is handled in main thread.
// Link: NSTextStorage limitation on size and frequency of updates
dispatch_block_t block = ^ {
NSAttributedString *attributeString = [[NSAttributedString alloc] initWithString:[NSString stringWithFormat:#"%#\n", strLog]];
NSTextStorage* store = [_textViewOutputLog textStorage];
[store beginEditing];
[store appendAttributedString:attributeString];
[store endEditing];
[_textViewOutputLog scrollRangeToVisible:NSMakeRange([[_textViewOutputLog string] length], 0)];
};
if ([NSThread isMainThread]) {
block();
} else {
dispatch_async(dispatch_get_main_queue(), block);
}