pass variable value by popToViewController in swift

I have a variable "NameofCircle" on LocationVC ViewController and i have variable CName on this Controller i want to pass the CName value to LocationVC Controller by popToViewController. I tried below code but did not get the result.

let viewControllers = self.navigationController!.viewControllers
    for aViewController in viewControllers
    {
        if aViewController is LocationVC
        {
           let Location = LocationVC()
            Location.NameofCircle = CName
    _ = self.navigationController?.popToViewController(aViewController, animated: true)
            }
}

Try this.

let viewControllers = self.navigationController!.viewControllers
  for var aViewController in viewControllers
  {
  if aViewController is LocationVC
     {
        let aVC = aViewController as! LocationVC
        aVC.NameofCircle = CName
        _ = self.navigationController?.popToViewController(aVC, animated: true)
     }
  }

another choice To pass value to Root ViewController

if let   myController  = self.navigationController?.viewControllers[0] as? LocationVC
  {
    myController.NameofCircle = CName
   _ =  self.navigationController?.popToViewController(myController, animated: true)
    }