barbuttonpop.swift

	@IBAction func buttonCalendar(sender: AnyObject) {
		
		guard let bbItem = sender as? UIBarButtonItem else { return }
		
		// instantiate the popover menu view controller
		let vc = PopMenuTableViewController()
		
		// set the desired size and background color
		vc.preferredContentSize = CGSize(width: 140, height: 180)
		vc.view.backgroundColor = UIColor.lightGrayColor()
		
		// set the custom PopoverMenuDelegate to self
		vc.menuDelegate = self
		
		// tell the popover which item is currently selected
		vc.checkMarkIndex = currentSelection
		
		// set the popover "styling"
		vc.modalPresentationStyle = .Popover
		
		vc.popoverPresentationController?.backgroundColor = UIColor.lightGrayColor()
		
		// tell it what object to use as the popover "pointy thingy" reference
		vc.popoverPresentationController?.barButtonItem = bbItem
		
		// set the UIPopoverPresentationControllerDelegate to self
		vc.popoverPresentationController?.delegate = self
		
		// show the popover menu
		presentViewController(vc, animated: true, completion: nil)
	}