上文iOS下拉搜索的几种实现方式（一）提供了普通视图控制器下拉搜索的几种方法。但如果我们是在导航控制器中使用搜索，就变得简单了。因为我们可以直接使用系统提供的方案。

import UIKit

class TableViewController: UITableViewController {
    var array = (0...99).map { String($0) }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        customizeNavigationController()
    }
    
    private func customizeNavigationController() {
        self.navigationItem.leftBarButtonItem = editButtonItem
        self.navigationItem.title = "Pull to Search"
        self.navigationController?.navigationBar.prefersLargeTitles = true
        
        self.navigationItem.searchController = {
            let sc = UISearchController(searchResultsController: nil)
            sc.searchResultsUpdater = self
            sc.hidesNavigationBarDuringPresentation = true
            sc.obscuresBackgroundDuringPresentation = false
            
            sc.searchBar.delegate = self
            sc.searchBar.searchBarStyle = .minimal
            
            return sc
        }()
    }
    
    // MARK: - Table view data source
    
    override func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }
    
    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return array.count
    }
    
    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
        cell.textLabel?.text = array[indexPath.row]
        
        return cell
    }
}

// MARK: -
extension TableViewController:UISearchBarDelegate {
    func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
        tableView.tableHeaderView = nil
    }
}

// MARK: -
extension TableViewController:UISearchResultsUpdating {
    func updateSearchResults(for searchController: UISearchController) {
        array = (0...99).map({ String($0) })
            .filter({
                guard let text = self.navigationItem.searchController?.searchBar.text, !text.isEmpty else {
                    return true
                }
                
                return $0.contains(text)
            })
        
        tableView.reloadData()
    }
}

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iOS下拉搜索的几种实现方式（一）