问如何在表视图中快速地将节脚注固定在某个特定脚注的末尾

EN

override func tableView(_ tableView: UITableView, viewForFooterInSection section: Int) -> UIView? {
    let footerView = UIView()
    if section == 1 {
        let label = UILabel()
        label.text = "A sticky footer here..."
        label.font = .systemFont(ofSize: 16)
        label.textColor = UIColor.gray
        label.backgroundColor = UIColor.clear
        label.textAlignment = .left
        footerView.addSubview(label)
        label.translatesAutoresizingMaskIntoConstraints = false
        label.topAnchor.constraint(equalTo: footerView.topAnchor, constant: 10).isActive = true
        label.leftAnchor.constraint(equalTo: footerView.leftAnchor, constant: 20).isActive = true
        label.rightAnchor.constraint(equalTo: footerView.rightAnchor).isActive = true
        label.bottomAnchor.constraint(equalTo: footerView.bottomAnchor).isActive = true
    }
    return footerView
}