title: How to stop the activity indicator in swift after a condition is met?
body: <p>I have declared a UIActivityIndicatorView as a computed property in extension of my model. I have a method configureCell where I'm trying to use activity indicator as a subview of an imageView. Here I'm able to position the indicator on certain condition but am not able to do any changes on it later. E.g I am not able to stop the activity indicator, not able to change the color, not able to even hide it.  </p>
  
  <pre><code>extension TranscationModel: UITableViewDataSource, UITableViewDelegate
  {
  
   var activityIN: UIActivityIndicatorView {
      var act = UIActivityIndicatorView(activityIndicatorStyle: UIActivityIndicatorViewStyle.Gray)
      act.color = UIColor.redColor()
      act.hidden = false
      act.startAnimating()
      return act
  }
  
  func configureTransactionCell(cell : TransactionCell?, indexPath: NSIndexPath) {
      if transaction.tid == "Something" {
          activityIN.color = UIColor.greenColor() //Even this doesn't work
          activityIN.center = cell.imgTransactionBill.center
          cell.imgTransactionBill.addSubview(activityIN)
          let delayTime = dispatch_time(DISPATCH_TIME_NOW, Int64(10 * Double(NSEC_PER_SEC)))
          dispatch_after(delayTime, dispatch_get_main_queue()) {
               activityIN.stopAnimating() //Not working
               activityIN.hidden = true   //Not working
          }
      }
  }
  </code></pre>