如何将按钮添加到UITableView的页脚视图，但保留最后一个单元格分隔符？

import UIKit

class CustomFooterView: UIView {
    let button: UIButton = {
        let button = UIButton(type: .system)
        button.setTitle("按钮", for: .normal)
        button.setTitleColor(.white, for: .normal)
        button.backgroundColor = .blue
        button.addTarget(self, action: #selector(buttonTapped), for: .touchUpInside)
        return button
    }()
    
    let separatorView: UIView = {
        let view = UIView()
        view.backgroundColor = .lightGray
        return view
    }()
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        
        addSubview(button)
        addSubview(separatorView)
        
        // 使用Auto Layout布局
        button.translatesAutoresizingMaskIntoConstraints = false
        separatorView.translatesAutoresizingMaskIntoConstraints = false
        
        NSLayoutConstraint.activate([
            button.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 16),
            button.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -16),
            button.topAnchor.constraint(equalTo: topAnchor, constant: 8),
            button.bottomAnchor.constraint(equalTo: separatorView.topAnchor, constant: -8),
            
            separatorView.leadingAnchor.constraint(equalTo: leadingAnchor),
            separatorView.trailingAnchor.constraint(equalTo: trailingAnchor),
            separatorView.bottomAnchor.constraint(equalTo: bottomAnchor),
            separatorView.heightAnchor.constraint(equalToConstant: 1)
        ])
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    @objc func buttonTapped() {
        // 处理按钮点击事件的逻辑
    }
}

class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
    let tableView = UITableView()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        tableView.delegate = self
        tableView.dataSource = self
        tableView.register(UITableViewCell.self, forCellReuseIdentifier: "Cell")
        
        view.addSubview(tableView)
        
        // 使用Auto Layout布局
        tableView.translatesAutoresizingMaskIntoConstraints = false
        
        NSLayoutConstraint.activate([
            tableView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
            tableView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
            tableView.topAnchor.constraint(equalTo: view.topAnchor),
            tableView.bottomAnchor.constraint(equalTo: view.bottomAnchor)
        ])
    }
    
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return 10
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
        cell.textLabel?.text = "单元格 \(indexPath.row)"
        return cell
    }
    
    func tableView(_ tableView: UITableView, viewForFooterInSection section: Int) -> UIView? {
        let footerView = CustomFooterView(frame: CGRect(x: 0, y: 0, width: tableView.frame.width, height: 60))
        return footerView
    }
    
    func tableView(_ tableView: UITableView, heightForFooterInSection section: Int) -> CGFloat {
        return 60
    }
}