popoverpresentviewcontroller with rectangle corner and without arrow

I want a popover without rounded corners and with no arrow.

I have done the following code but it did not work:

//SerachPopViewController.swift

    //MARK: InitCoder
required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
    //popover settings
    //popoverPresentationController!.permittedArrowDirections = .Any
    modalPresentationStyle = .Popover
    popoverPresentationController!.delegate = self
    //permittedArrowDirections = UIPopoverArrowDirection(rawValue: 0)
    self.preferredContentSize = CGSize(width:340,height:380)
}

//QueryTableViewController.swift

    @IBAction func searchFilter(sender: AnyObject) {

    let searchPopController = storyboard!.instantiateViewControllerWithIdentifier("SerachPopViewController") as! SerachPopViewController
    searchPopController.serachPopDelegate = self
    searchPopController.modalPresentationStyle = .Popover
    searchPopController.preferredContentSize = CGSize(width:340,height:380)

    let popoverPresentationController = searchPopController.popoverPresentationController

    popoverPresentationController!.sourceView = self.view;
    popoverPresentationController!.sourceRect = CGRectMake(CGRectGetMidX(self.view.bounds), CGRectGetMidY(self.view.bounds),0,0)
    popoverPresentationController!.permittedArrowDirections = UIPopoverArrowDirection();
    self.presentViewController(searchPopController, animated: true, completion: nil)
}

I am able to display popover view with arrow and rounded arrow.

Please help me to achieve:

popup view with rectangle corner
popup view without direction arrows

Solution

I was not 100% happy with shawnynicole's answer because I realized the change from the rounded to the rectangular corners are notable/visible.

So I came up with this: subclass the view controller (in my case it was an UINavigationController) and override viewDidLayoutSubviews and update corners there. This is better because corners change animation is not visible and it will be updated every time needed (on rotations, etc).

It works in iOS11 and probably should work on others versions too.

class PopoverNavigationController: UINavigationController {

    @IBInspectable var cornerRadius: Int = -1

    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
        let r = CGFloat(cornerRadius)
        if r >= 0 && view.superview?.layer.cornerRadius != r {
            view.superview?.layer.cornerRadius = r
        }
    }
}