Drawing a rectangle with only two rounded corners using Bezier Path and Storyboarding in Swift 2.3

I have Table View with 5 cells as described below. The intent is to have a topRoundedBorderCell with a white fill and just the TopLeft and TopRight borders rounded, then have the flexibility to add as many cells as needed with the white fill and squared corners for as many options as desired, lastly the bottomRoundedCornerCell will have the white fill with just the BottomLeft and BottomRight corners rounded. Creating the illusion of one long white box with rounded corners that fits all of the options pertaining to one group. Shown below.

Storyboard cells breakdown:

When I run the app:

However, as you can see in the 2nd image, only the TopLeft border is rounded, the rest remain squared.

I am using the Bezier Path roundedRect method in 2 separate classes of type UIView which I assign to the respective views through my Storyboard.

Top Rounded Borders View:

class TopRectangleRoundedCornersView: UIView {

    override func awakeFromNib() {

        let path = UIBezierPath(roundedRect: self.bounds, byRoundingCorners: [UIRectCorner.TopLeft , UIRectCorner.TopRight], cornerRadii: CGSize(width:10.0, height:10.0))
        let mask = CAShapeLayer()
        mask.path = path.CGPath
        self.layer.mask = mask
        self.layer.backgroundColor = UIColor.whiteColor().CGColor //white fill
    }

}

Bottom Rounded Borders View:

class BottomRectangleRoundedCornersView: UIView {

    override func awakeFromNib() {
        let path = UIBezierPath(roundedRect: self.bounds,
                                byRoundingCorners: [UIRectCorner.BottomLeft, UIRectCorner.BottomRight], cornerRadii: CGSize(width: 10.0, height: 10.0))
        let mask = CAShapeLayer()
        mask.path = path.CGPath
        self.layer.mask = mask
        self.layer.backgroundColor = UIColor.whiteColor().CGColor //white fill
    }
}