Present Pop-up UIAlertController from within UITableViewCell Without UITableView - swift

Question

In my iOS app I have a UIViewController ViewController that presents a view that is partly made up of a TableView. The UITableViewCells include a UISegmentControl. When the UISegmentControl's valueHasChanged action is called, I want to present a pop-up. This is the code called within the action:
//Check that the text field isn't empty:
if self.TextField.text == "" {
self.Status.selectedSegmentIndex = 0
let viewController = ViewController()
viewController.alertStatusChangedForEmptyTextField(self)
}
This is the pop-up I have created within the ViewController class that checks if an adjacent text field in the same UITableViewCell is empty or not:
//Alert function that handles when toggle is set even though there is no content.
func alertStatusChangedForEmptyTextField(sender: AnyObject) {
let alert = UIAlertController(title: "Text field has no contents", message: "Please enter a text.", preferredStyle: UIAlertControllerStyle.Alert);
alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.Cancel, handler: nil));
showViewController(alert, sender: self);
}
I get an error that pops up in the viewDidLoad function of the ViewController, but originates from the showViewController method call within this function (I know because I've tried commenting out only this last line and then everything works fine).
How can I call a pop-up(ViewController) from within a UITableViewCell? Happy to hear suggestions that involve completely different approaches (Creating a custom UITableView subclass? A function that is defined within the TableViewCell class?)
Also, I don't have a root view controller.

Answer 1

check the value of storyboard, there is a good chance that you will find it nil;
storyboard.instantiateViewControllerWithIdentifier("PopMenuViewController") as! PopMenuViewController
I am trying to figure out how to present the pop up from custom tableview cell element. If you figured it out than do share the method :)