在swift中使用tableview搜索控制器滚动

class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
    @IBOutlet weak var tableView: UITableView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        tableView.dataSource = self
        tableView.delegate = self
    }
    
    // 实现TableView的数据源和代理方法
    // ...
}

class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate, UISearchResultsUpdating {
    @IBOutlet weak var tableView: UITableView!
    
    let searchController = UISearchController(searchResultsController: nil)
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        tableView.dataSource = self
        tableView.delegate = self
        
        searchController.searchResultsUpdater = self
        searchController.obscuresBackgroundDuringPresentation = false
        searchController.searchBar.placeholder = "搜索"
        navigationItem.searchController = searchController
        definesPresentationContext = true
    }
    
    // 实现TableView的数据源和代理方法
    // ...
    
    // 实现SearchController的更新方法
    func updateSearchResults(for searchController: UISearchController) {
        // 根据搜索关键字过滤数据并刷新TableView
        // ...
    }
}

class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate, UISearchResultsUpdating {
    @IBOutlet weak var tableView: UITableView!
    
    let searchController = UISearchController(searchResultsController: nil)
    
    var data = ["Apple", "Banana", "Orange", "Grape", "Watermelon"]
    var filteredData = [String]()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        tableView.dataSource = self
        tableView.delegate = self
        
        searchController.searchResultsUpdater = self
        searchController.obscuresBackgroundDuringPresentation = false
        searchController.searchBar.placeholder = "搜索"
        navigationItem.searchController = searchController
        definesPresentationContext = true
    }
    
    // 实现TableView的数据源和代理方法
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        if isFiltering() {
            return filteredData.count
        }
        return data.count
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
        
        let item: String
        if isFiltering() {
            item = filteredData[indexPath.row]
        } else {
            item = data[indexPath.row]
        }
        
        cell.textLabel?.text = item
        
        return cell
    }
    
    // 实现SearchController的更新方法
    func updateSearchResults(for searchController: UISearchController) {
        filterContentForSearchText(searchController.searchBar.text!)
    }
    
    // 根据搜索关键字过滤数据
    func filterContentForSearchText(_ searchText: String) {
        filteredData = data.filter { $0.lowercased().contains(searchText.lowercased()) }
        tableView.reloadData()
    }
    
    // 判断是否正在搜索
    func isFiltering() -> Bool {
        return searchController.isActive && !searchBarIsEmpty()
    }
    
    // 判断搜索栏是否为空
    func searchBarIsEmpty() -> Bool {
        return searchController.searchBar.text?.isEmpty ?? true
    }
}