class ButtonWithTouchSize: UIButton {
    var touchAreaPadding: UIEdgeInsets?
    override func point(inside point: CGPoint, 
                        with event: UIEvent?) -> Bool 
    {
        guard let insets = touchAreaPadding else {
            return super.point(inside: point, with: event)
        }
        let rect = UIEdgeInsetsInsetRect(bounds, insets.inverted())
        return rect.contains(point)
    }
}

extension UIEdgeInsets {
    
    func inverted() -> UIEdgeInsets {
        return UIEdgeInsets(top: -top, left: -left, 
                            bottom: -bottom, right: -right)
    }
}