How search in UITableView with Array of model - ios

Question

I want to search for some data in the table view using the search bar, but when I try to find data in my model, I'm not able to search that data.
I made a expand table view cell and created a search bar for searching data, but still I can't search the data in the model. How can I achieve that?
my code is here:
import UIKit
protocol SelectCurrencyViewControllerDelegate: AnyObject {
func selectedCurrency(_ curency: CurrencyModel)
}
final class SelectCurrencyViewController: UIViewController {
weak var delegate: SelectCurrencyViewControllerDelegate?
//MARK: - Private properties
private let currencyCellIdentifier = "currencyCell"
private let currencyArray = [CurrencyModel(shortName: "RUB", fullName: "Russian ruble"),
CurrencyModel(shortName: "USD", fullName: "US Dollar"),
CurrencyModel(shortName: "EUR", fullName: "Euro")]
//MARK: - UI elements
private let currencyTableView = UITableView()
private let searchBarCurrency = UISearchBar()
//MARK: - Lifecycle
override func viewDidLoad() {
super.viewDidLoad()
setupUI()
}
//MARK: - Private methods
private func setupUI() {
view.backgroundColor = .systemBackground
view.addSubview(searchBarCurrency)
view.addSubview(currencyTableView)
settingsSearchbar()
settingsCurrencyTableView()
setConstraints()
}
private func settingsSearchbar() {
searchBarCurrency.translatesAutoresizingMaskIntoConstraints = false
searchBarCurrency.delegate = self
}
private func settingsCurrencyTableView() {
currencyTableView.dataSource = self
currencyTableView.delegate = self
currencyTableView.register(CustomCurrencyCell.self, forCellReuseIdentifier: currencyCellIdentifier)
currencyTableView.translatesAutoresizingMaskIntoConstraints = false
}
private func setConstraints() {
NSLayoutConstraint.activate([
searchBarCurrency.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor),
searchBarCurrency.leadingAnchor.constraint(equalTo: view.leadingAnchor),
searchBarCurrency.trailingAnchor.constraint(equalTo: view.trailingAnchor),
currencyTableView.topAnchor.constraint(equalTo: searchBarCurrency.bottomAnchor),
currencyTableView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
currencyTableView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
currencyTableView.bottomAnchor.constraint(equalTo: view.bottomAnchor)
])
}
}
//MARK: - UISearchBarDelegate
extension SelectCurrencyViewController: UISearchBarDelegate {
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
print(searchText)
}
}
//MARK: - UITableViewDelegate, UITableViewDataSource
extension SelectCurrencyViewController: UITableViewDelegate, UITableViewDataSource {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
currencyArray.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: currencyCellIdentifier,
for: indexPath) as? CustomCurrencyCell
cell?.configure(shortName: currencyArray[indexPath.row].shortName,
fullName: currencyArray[indexPath.row].fullName)
return cell ?? UITableViewCell()
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
delegate?.selectedCurrency(currencyArray[indexPath.row])
navigationController?.popViewController(animated: true)
}
}
my code of CustomCell here:
import UIKit
final class CustomCurrencyCell: UITableViewCell {
//MARK: - UI Elements
private let currencyBoldLabel = UILabel()
private let currencyNormalFullLabel = UILabel()
//MARK: - Life Cycle
override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
super.init(style: style, reuseIdentifier: reuseIdentifier)
setupUI()
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
//MARK: - Configure
func configure(shortName: String, fullName: String) {
currencyBoldLabel.text = shortName
currencyNormalFullLabel.text = fullName
}
//MARK: - Private methods
private func setupUI() {
addSubview(currencyBoldLabel)
addSubview(currencyNormalFullLabel)
settingsCurrencyBoldLabel()
setConstraints()
}
private func settingsCurrencyBoldLabel() {
currencyBoldLabel.translatesAutoresizingMaskIntoConstraints = false
currencyBoldLabel.font = UIFont.systemFont(ofSize: 14, weight: .bold)
}
private func setConstraints() {
currencyNormalFullLabel.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
currencyBoldLabel.centerYAnchor.constraint(equalTo: centerYAnchor),
currencyBoldLabel.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 16),
currencyNormalFullLabel.centerYAnchor.constraint(equalTo: centerYAnchor),
currencyNormalFullLabel.leadingAnchor.constraint(equalTo: currencyBoldLabel.trailingAnchor, constant: 8)
])
}
}
and code of my Model:
import Foundation
struct CurrencyModel {
let shortName: String
let fullName: String
}
I try this add search data
private var searchDate = [CurrencyModel]()
and in searchBarDelegate try this:
extension SelectCurrencyViewController: UISearchBarDelegate {
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
searchDate = searchText.isEmpty ? currencyArray : currencyArray.filter {$0.fullName.contains(searchText)}
currencyTableView.reloadData()
}
}
Idk how cast my cell in cellForRowAt, cause I used configure
and if I trying
cell?.currencyNormalFullLabel.text = searchDate[indexPath.row].fullName
my app crashed

Answer 1

I have solved my problem:
In viewDidLoad I’m add
filtredData = currencyArray
and in numberOfRowsInSection change like this:
extension SelectCurrencyViewController: UITableViewDelegate, UITableViewDataSource {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
filtredData.count
}
and cast my cell like this:
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: currencyCellIdentifier,
for: indexPath) as? CustomCurrencyCell
cell?.configure(shortName: filtredData[indexPath.row].shortName,
fullName: filtredData[indexPath.row].fullName)
return cell ?? UITableViewCell()
}
and finally edit my filter method:
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
filtredData = []
if searchText == "" {
filtredData = currencyArray
}
for word in currencyArray {
if word.fullName.lowercased().contains(searchText.lowercased()) ||
word.shortName.lowercased().contains(searchText.lowercased()) {
filtredData.append(word)
}
}
self.currencyTableView.reloadData()
}