let path = UIBezierPath(roundedRect: yourtextField.bounds, byRoundingCorners: [.TopRight, .TopLeft], cornerRadii : CGSizeMake(15.0, 15.0))

        let templayer = CAShapeLayer()
        templayer.path = path.CGPath
        yourtextField.layer.mask = maskLayer

self.textfield.borderStyle = .None