Present a popover from an arbitrary anchor point in Swift

Update to func syntax above:

func adaptivePresentationStyle(for controller: UIPresentationController) -> UIModalPresentatinStyle { 
    return .none 
}

For some reason the old syntax is still allowed but is not active and will not implement popup or anchor correctly.

Updated for Swift 3

In the storyboard, add a view controller that you would like to be the popover. Set the Storyboard ID to be "popoverId".

Also add a button to your main view controller and hook up the IBAction to the following code.

import UIKit
class ViewController: UIViewController, UIPopoverPresentationControllerDelegate {

    @IBAction func buttonTap(sender: UIButton) {

        // get a reference to the view controller for the popover
        let popController = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "popoverId")

        // set the presentation style
        popController.modalPresentationStyle = UIModalPresentationStyle.popover

        // set up the popover presentation controller
        popController.popoverPresentationController?.permittedArrowDirections = UIPopoverArrowDirection.up
        popController.popoverPresentationController?.delegate = self
        popController.popoverPresentationController?.sourceView = sender // button
        popController.popoverPresentationController?.sourceRect = sender.bounds

        // present the popover
        self.present(popController, animated: true, completion: nil)
    }

    // UIPopoverPresentationControllerDelegate method
    func adaptivePresentationStyleForPresentationController(controller: UIPresentationController) -> UIModalPresentationStyle {
        // Force popover style
        return UIModalPresentationStyle.none
    }
}

Setting the sourceView and sourceRect is what allows you to choose an arbitrary point to display the popover.

That's it. Now it should like something like this when the button is tapped.

Thanks to this article for help.

Solution for Swift 3.1 :

Add to your ViewController UIPopoverPresentationControllerDelegate delegate :

class OriginalViewController: UIViewController, UIPopoverPresentationControllerDelegate

Add a button to your ViewController and on tap on your button, call this code :

    let controller = MyPopViewController()
    controller.modalPresentationStyle = UIModalPresentationStyle.popover
    let popController = controller.popoverPresentationController
    popController?.permittedArrowDirections = .any
    popController?.delegate = self
    popController?.sourceRect = (self.myButton?.bounds)!
    popController?.sourceView =  self.myButton
    self.present(controller, animated: true, completion: nil)