Hi

To present a controller as a popOver we use UIPopoverPresentationController. It  display the content in a popover. We can easily do it by setting controller presentation Style as popover and then presenting it.

Add UIPopoverPresentationControllerDelegate on your ViewController

class ViewController: UIViewController , UIPopoverPresentationControllerDelegate{
}

Instantiate a controller from Storyboard  and set its modalPresentationStyle as popOver , we can also manage its arrow direction by setting permittedArrowDirections.

let popVc = self.storyboard?.instantiateViewController(withIdentifier: "PopOverViewController") as? PopOverViewController 
        
        popVc?.modalPresentationStyle = .popover
        let popover = popVc?.popoverPresentationController!
        popover?.delegate = self      
        popover?.permittedArrowDirections = .down // for arrow direction
        popVc?.preferredContentSize = CGSize(width: 100, height: 100) //set size of popover 
        popover?.sourceView = popVc?.view
        popover?.sourceRect = CGRect.init(x: 150, y: 200, width: 50 , height: 50) // set the  point  to display popover
        present(popVc!, animated: true, completion:nil) // present PopOver

Once done with the above steps, conform UIPopoverPresentationControllerDelegate method to avoid full screen presentation

func adaptivePresentationStyle(for controller: UIPresentationController, traitCollection: UITraitCollection) -> UIModalPresentationStyle {
        return .none
    }

To dismiss PopOver add :

 self.dismiss(animated: true, completion: {
                    
            })

Thanks