如何在集合视图控制器中添加搜索栏？

class MyCollectionViewController: UICollectionViewController, UISearchResultsUpdating {
    var searchController: UISearchController!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 初始化搜索控制器
        searchController = UISearchController(searchResultsController: nil)
        searchController.searchResultsUpdater = self
        
        // 将搜索栏添加到集合视图的表头视图中
        collectionView?.collectionViewLayout = UICollectionViewFlowLayout()
        collectionView?.register(UICollectionReusableView.self, forSupplementaryViewOfKind: UICollectionView.elementKindSectionHeader, withReuseIdentifier: "Header")
        collectionView?.contentInsetAdjustmentBehavior = .always
    }
}

extension MyCollectionViewController: UICollectionViewDelegateFlowLayout {
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, referenceSizeForHeaderInSection section: Int) -> CGSize {
        return CGSize(width: collectionView.bounds.width, height: searchController.searchBar.bounds.height)
    }
}

extension MyCollectionViewController: UISearchResultsUpdating {
    func updateSearchResults(for searchController: UISearchController) {
        // 处理搜索栏输入的逻辑
    }
}

override func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView {
    let headerView = collectionView.dequeueReusableSupplementaryView(ofKind: kind, withReuseIdentifier: "Header", for: indexPath)
    
    // 将搜索栏添加到表头视图中
    headerView.addSubview(searchController.searchBar)
    
    return headerView
}