如何在货币转换器应用 Swift 中实现搜索栏？

如何解决如何在货币转换器应用 Swift 中实现搜索栏？

我正在尝试在我的货币转换器应用程序中实现一个搜索栏。但问题是我正在使用 API 解析来自 JSON 的数据，但我不知道如何将货币缩写与我的搜索栏连接起来。我确实尝试将所有货币缩写硬编码到一个数组中，但没有奏效。任何帮助将不胜感激。相关代码如下：

class ViewController: UIViewController,UITableViewDataSource,UITableViewDelegate,UISearchBarDelegate {

struct Currency: Decodable {
    let base: String
    let date: String
    let rates: [String : Double]
}

@IBOutlet weak var rateField: UITextField!
@IBOutlet weak var conversionTableView: UITableView!
@IBOutlet weak var button: UIButton!
@IBOutlet weak var searchBar: UISearchBar!

var eur: Currency?
var baseRate = 1.0
var data = ["AED","AFN","ALL","AMD","ANG","AOA","ARS","ATS","AUD","AWG","AZN","BAM","BBD","BDT","BEF","BGN","BHD","BIF","BMD","BND","BOB","BRL","BSD","BTN","BWP","BYR","BZD","CAD","CDF","CHF","CLP","CNY","cop","COU","CRC","CUC","CUP","CVE","CZK","DEM","DJF","DKK","DOP","DZD","EEK","EGP","ERN","ESP","ETB","EUR","FIM","FJD","FKP","FRF","GBP","GEL","GHS","GIP","GMD","GNF","Grd","GTQ","GYD","HKD","HNL","HRK","HTG","HUF","IDR","IEP","ILS","INR","IQD","IRR","ISK","ITL","JMD","JOD","JPY","KES","KGS","KHR","KMF","KPW","KRW","KWD","KYD","KZT","LAK","LBP","LKR","LRD","LSL","LTL","LUF","LVL","LYD","MAD","MDL","MGA","MKD","MMK","MNT","MOP","MRO","MUR","MVR","MWK","MXN","MYR","MZN","NAD","NGN","NIO","NLG","NOK","NPR","NZD","omr","PAB","PEN","PGK","PHP","PKR","PLN","PTE","PYG","QAR","RON","RSD","RUB","RWF","SAR","SBD","SCR","SDG","SEK","SGD","SHP","SIT","sll","SOS","SRD","STD","SVC","SYP","SZL","THB","TJS","TMT","TND","TOP","TRY","TTD","TWD","TZS","UAH","UGX","USD","UYI","UYU","UZS","VEF","VND","VUV","WST","XAF","XCD","XDR","XOF","XPF","YER","ZAR","ZMK","ZWL"]

var filteredData: [String]!

override func viewDidLoad() {
    super.viewDidLoad()
    
    searchBar.delegate = self
    filteredData = data
    
    rateField.round()
    conversionTableView.round()
    button.round()
    
    conversionTableView.dataSource = self
    conversionTableView.delegate = self
    conversionTableView.allowsSelection = false
    
    fetchData()
}

@IBAction func onConvertButtonTapped(_ sender: UIButton) {
    
    if let iGetString = rateField.text {
        if let isDouble = Double(iGetString) {
            baseRate = isDouble
            fetchData()
        } else {
            let alertControl = UIAlertController(title: "Wrong data!",message: "Please,use digits only!",preferredStyle: .alert)
            let cancelAction = UIAlertAction(title: "dismiss",style: .destructive,handler: nil)
            alertControl.addAction(cancelAction)
            present(alertControl,animated: true,completion: nil)
        }
    }
}

func fetchData() {
    let url = URL(string: "http://data.fixer.io/api/latest?=EUR")
    URLSession.shared.dataTask(with: url!) { (data,response,error) in
        if error == nil {
            do {
                self.eur = try JSONDecoder().decode(Currency.self,from: data!)
            } catch {
                print("Parse Error")
            }
            dispatchQueue.main.async {
                self.conversionTableView.reloadData()
            }
        } else {
            print("Error")
        }
    }.resume()
}

func tableView(_ tableView: UITableView,numberOfRowsInSection section: Int) -> Int {
    if let currencyFetched = eur {
        return currencyFetched.rates.count
    }
    return 0
}

func tableView(_ tableView: UITableView,cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = UITableViewCell(style: .value1,reuseIdentifier: nil)
    if let currencyFetched = eur {
        cell.textLabel?.text = Array(currencyFetched.rates.keys)[indexPath.row]
        let selectedrate = baseRate * Array(currencyFetched.rates.values)[indexPath.row]
        cell.detailTextLabel?.text = "\(String(format: "%.2f",selectedrate))"
        return cell
    }
    return UITableViewCell()
}

func searchBar(_ searchBar: UISearchBar,textDidChange searchText: String) {
    filteredData = []
    if searchText == "" {
        filteredData = data
    } else {
        for currency in data {
            if currency.lowercased().contains(searchText.lowercased()) {
                filteredData.append(currency)
            }
        }
    }
    self.conversionTableView.reloadData()
}

}