嵌入Navigation Controller的UISearchController在紧凑屏iOS设备上异常

• 初始预期行为：
  
• 搜索栏激活后的行为：
  
• 横屏切换后的异常行为：切换至横屏后，键盘收起，搜索栏失焦，且点击Cancel按钮后该按钮无法隐藏
  

class MyViewController: UIViewController, UITableViewDataSource, UITableViewDelegate, UISearchResultsUpdating {
    // Table view and search controller
    private var tableView: UITableView!
    private var searchController: UISearchController!
    
    // Data source
    private var data: [String] = ["Apple", "Banana", "Orange", "Pineapple", "Grapes", "Watermelon"]
    private var filteredData: [String] = []
    
    override func viewDidLoad() {
        super.viewDidLoad()
        title = "My View Controller"
        view.backgroundColor = .systemBackground
        // Set up table view
        tableView = UITableView()
        tableView.translatesAutoresizingMaskIntoConstraints = false
        tableView.dataSource = self
        tableView.delegate = self
        view.addSubview(tableView)
        
        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)
        ])
        
        // Set up search controller
        searchController = UISearchController(searchResultsController: nil)
        searchController.searchResultsUpdater = self
        searchController.obscuresBackgroundDuringPresentation = false
        navigationItem.searchController = searchController
        navigationItem.hidesSearchBarWhenScrolling = false
        navigationItem.largeTitleDisplayMode = .always
        navigationController?.navigationBar.prefersLargeTitles = true
        definesPresentationContext = true
    }
    
    // MARK: - Table View DataSource
    
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        if isFiltering() {
            return filteredData.count
        } else {
            return data.count
        }
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = UITableViewCell(style: .default, reuseIdentifier: "Cell")
        let item: String
        
        if isFiltering() {
            item = filteredData[indexPath.row]
        } else {
            item = data[indexPath.row]
        }
        
        cell.textLabel?.text = item
        
        return cell
    }
    
    // MARK: - Table View Delegate
    
    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        tableView.deselectRow(at: indexPath, animated: true)
        // Handle row selection if needed
    }
    
    // MARK: - Search Controller
    
    func updateSearchResults(for searchController: UISearchController) {
        let searchText = searchController.searchBar.text ?? ""
        filterContent(for: searchText)
    }
    
    func filterContent(for searchText: String) {
        filteredData = data.filter { item in
            return item.lowercased().contains(searchText.lowercased())
        }
        
        tableView.reloadData()
    }
    
    func isFiltering() -> Bool {
        return searchController.isActive && !searchBarIsEmpty()
    }
    
    func searchBarIsEmpty() -> Bool {
        return searchController.searchBar.text?.isEmpty ?? true
    }
}

该示例在常规设备上运行完全正常。

内容的提问来源于stack exchange，提问作者Balaji Royal