Maximum one checkmark in TableView in Swift - swift

Question

I would like that users can choose maximum one voice. And that the checkmark jumps to where you tapt and deselect the other.
It looks like very simple, but I don't see the solution. And I can't find the answer on the internet.
Please can anybody help me?
Thanks advance!
import UIKit
import AVFoundation
class voicesTableViewController: UITableViewController {
fileprivate let synthesizer = AVSpeechSynthesizer()
fileprivate var speechVoices = AVSpeechSynthesisVoice.speechVoices()
override func viewDidLoad() {
super.viewDidLoad()
}
// MARK: - Table view data source
override func numberOfSections(in tableView: UITableView) -> Int {
// #warning Incomplete implementation, return the number of sections
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete implementation, return the number of rows
return speechVoices.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
//Name
let voice = speechVoices[indexPath.row]
let voiceLang = voice.language as? String
let theVoice = UserDefaults.standard.object(forKey:"voice") as? String
cell.textLabel?.text = voice.name
// Language
if let language = countryName(countryCode: voice.language) {
cell.detailTextLabel?.text = "\(language)"
}
else {
cell.detailTextLabel?.text = ""
}
cell.detailTextLabel?.textColor = UIColor.gray
// Checkmark
if (theVoice != nil) {
if(theVoice == voiceLang) {
cell.accessoryType = UITableViewCellAccessoryType.checkmark
}
}
return cell
}
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let voice = speechVoices[indexPath.row]
if tableView.cellForRow(at: indexPath)?.accessoryType == UITableViewCellAccessoryType.checkmark {
tableView.cellForRow(at: indexPath)?.accessoryType = UITableViewCellAccessoryType.none
}
else
{
//if ((tableView.indexPathsForSelectedRows?.count)! > 1) {
tableView.cellForRow(at: indexPath)?.accessoryType = UITableViewCellAccessoryType.checkmark
//}
}
UserDefaults.standard.set(voice.language, forKey:"voice")
UserDefaults.standard.synchronize()
tableView.deselectRow(at: indexPath, animated: true)
}
func countryName(countryCode: String) -> String? {
let preferredLanguage = NSLocale.preferredLanguages[0] as String
let current = Locale(identifier: preferredLanguage)
return current.localizedString(forLanguageCode: countryCode) ?? nil
//return current.localizedString(forIdentifier: indentifier) ? nil
}
}

Answer 1

Simple change of function cellForRow:atIndexPathshould work:
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
//Name
let voice = speechVoices[indexPath.row]
let voiceLang = voice.language as? String
let theVoice = UserDefaults.standard.object(forKey:"voice") as? String
cell.textLabel?.text = voice.name
// Language
if let language = countryName(countryCode: voice.language) {
cell.detailTextLabel?.text = "\(language)"
}
else {
cell.detailTextLabel?.text = ""
}
cell.detailTextLabel?.textColor = UIColor.gray
// Checkmark
if(theVoice != nil && theVoice == voiceLang) {
cell.accessoryType = .checkmark
} else {
cell.accessoryType = .none
}
return cell
}
UPD#1
But you can use better solution:
1) Add property fileprivate var selectedIndexPath: IndexPath?
2) Change function func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath)to next one:
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
//Name
let voice = speechVoices[indexPath.row]
let voiceLang = voice.language as? String
let theVoice = UserDefaults.standard.object(forKey:"voice") as? String
cell.textLabel?.text = voice.name
// Language
if let language = countryName(countryCode: voice.language) {
cell.detailTextLabel?.text = "\(language)"
}
else {
cell.detailTextLabel?.text = ""
}
cell.detailTextLabel?.textColor = UIColor.gray
// Checkmark
cell.accessoryType = self.selectedIndexPath == indexPath ? .checkmark : .none
return cell
}
3) And then in func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) you can do next:
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let voice = speechVoices[indexPath.row]
self.selectedIndexPath = indexPath
UserDefaults.standard.set(voice.language, forKey:"voice")
UserDefaults.standard.synchronize()
tableView.deselectRow(at: indexPath, animated: true)
tableView.reloadRows(at: [indexPath], with: .automatic)
}