无法在HeaderView(表视图的标题视图)中添加UISearchBar？

import UIKit

class CustomHeaderView: UIView {
    
    let searchBar = UISearchBar()
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        setupSearchBar()
    }
    
    required init?(coder: NSCoder) {
        super.init(coder: coder)
        setupSearchBar()
    }
    
    private func setupSearchBar() {
        addSubview(searchBar)
        searchBar.translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate([
            searchBar.topAnchor.constraint(equalTo: self.topAnchor),
            searchBar.leadingAnchor.constraint(equalTo: self.leadingAnchor),
            searchBar.trailingAnchor.constraint(equalTo: self.trailingAnchor),
            searchBar.bottomAnchor.constraint(equalTo: self.bottomAnchor)
        ])
    }
}

import UIKit

class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
    
    var tableView: UITableView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        tableView = UITableView(frame: view.bounds, style: .plain)
        tableView.dataSource = self
        tableView.delegate = self
        view.addSubview(tableView)
        
        let headerView = CustomHeaderView(frame: CGRect(x: 0, y: 0, width: view.bounds.width, height: 50))
        tableView.tableHeaderView = headerView
    }
    
    // MARK: - UITableViewDataSource
    
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return 10 // 示例数据
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = UITableViewCell(style: .default, reuseIdentifier: "cell")
        cell.textLabel?.text = "Row \(indexPath.row)"
        return cell
    }
}