PopoverPresentationController coming as nil

Created a SingleViewApplication in that I have placed a button.

Now clicking on button I need to display a tableView as popover. The TableViewController is created in xib.

The issue is tableViewController.popoverPresentationController always comes as nil see below code

     let filterVC =  TableViewController(nibName: "TableViewController", bundle: nil)
    var filterDistanceViewController = UINavigationController(rootViewController: filterVC)
    filterDistanceViewController.preferredContentSize = CGSize(width: 300, height: 200)
    let popoverPresentationViewController = filterDistanceViewController.popoverPresentationController
    popoverPresentationViewController?.permittedArrowDirections = .any


    if let pop = filterDistanceViewController.popoverPresentationController {
        pop.delegate = self
    }

in above code filterDistanceViewController.popoverPresentationController is always coming as nil

Any hint in right direction will be highly appreciated.

You are not presenting anything, so you need to present the popoverPresentationViewController on the current viewcontroller, for example:

@IBAction func importantButtonPressed(_ sender: UIButton) {
         let tableViewController = UITableViewController()
         tableViewController.modalPresentationStyle = .popover

         present(tableViewController, animated: true, completion: nil)

        if let pop = tableViewController.popoverPresentationController {
          pop.delegate = self
        }

    }