如何使用UISearchController搜索普通话？

Question

我尝试使用json制作旅行数据并添加UISearchController。 看来我可以用英文和数字运行UISearchController了；但是，键入关键字时无法搜索普通话。

这里是代码，感谢可以帮助我的人！

class TableViewController: UITableViewController, UISearchResultsUpdating {

    func updateSearchResults(for searchController: UISearchController) {
        let searchString = searchController.searchBar.text!
        filteredData = travelData.filter({ (data) -> Bool in
            return (data.Name.contains(searchString) && data.Add.contains(searchString))
        })
        tableView.reloadData()
    }
    var travelData = [DetailData]()
    var filteredData = [DetailData]()

    override func viewDidLoad() {
        super.viewDidLoad()
        guard let url = "http://data.ntpc.gov.tw/api/v1/rest/datastore/382000000A-002491-001".addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed), let downloadUrl = URL(string: url) else {return}
        let task = URLSession.shared.dataTask(with: downloadUrl) { (data, response, error) in
            let decoder = JSONDecoder()
            print("Decoder")
            if let data = data{
                do{
                    let json = try decoder.decode(Alldata.self, from: data)
                    self.travelData = json.result.records
                    print("json")
                    DispatchQueue.main.async {
                        self.tableView.reloadData()
                    }
                }catch{
                    print(error.localizedDescription)
                }
            }
        }
        task.resume()

        navigationController?.navigationBar.prefersLargeTitles = false
        let searchController = UISearchController(searchResultsController: nil)
        searchController.searchResultsUpdater = self
        searchController.dimsBackgroundDuringPresentation = false
        navigationItem.searchController = searchController
        definesPresentationContext = true
        navigationItem.hidesSearchBarWhenScrolling = false

        let image = UIImage()
        self.navigationController?.navigationBar.setBackgroundImage(image, for: .default)
        self.navigationController?.navigationBar.shadowImage = image
    }
}

附有gif链接，以更好地了解我的处境。