如何防止UIButton的背景图片影响其intrinsicContentSize？

let image = UIImage(named: "background_image")?.resizableImage(withCapInsets: UIEdgeInsets(top: 10, left: 10, bottom: 10, right: 10), resizingMode: .stretch)
button.setBackgroundImage(image, for: .normal)

button.contentMode = .scaleToFill
button.setBackgroundImage(UIImage(named: "background_image"), for: .normal)

class CustomButton: UIButton {
    override var intrinsicContentSize: CGSize {
        return CGSize(width: 100, height: 50) // 自定义按钮的固定大小
    }
}

let button = CustomButton()
button.setBackgroundImage(UIImage(named: "background_image"), for: .normal)