ios-segues-tips-tricks-UIPopover-prepareForSegue.swift

class ViewController: UIViewController, UIPopoverPresentationControllerDelegate {

    @IBAction var sourceButton: UIButton!

    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        if segue.identifier == "SlideshowPopoverSegue" {
            let contentViewController = segue.destinationViewController
            
            contentViewController.modalPresentationStyle = UIModalPresentationStyle.Popover
            if let popover = contentViewController.popoverPresentationController {
                popover.delegate = self
                // Set the sourceView and sourceRect so that the popover knows
                // where to position itself
                popover.sourceView = sourceButton
                popover.sourceRect = sourceButton.bounds
            }
        }
    }
    
    // MARK: UIPopoverPresentationControllerDelegate
    func adaptivePresentationStyleForPresentationController(
            controller: UIPresentationController) -> UIModalPresentationStyle {
        return UIModalPresentationStyle.None
    }
}