Change the map's language

import UIKit
import MapboxMaps
 
public class LocalizationExample: UIViewController, ExampleProtocol {
 
internal var mapView: MapView!
private var cancelables = Set<AnyCancelable>()
 
override public func viewDidLoad() {
super.viewDidLoad()
 
let cameraOptions = CameraOptions(center: CLLocationCoordinate2D(latitude: 49.82598438746018, longitude: 9.6984608286634), zoom: 2)
mapView = MapView(frame: view.bounds, mapInitOptions: MapInitOptions(cameraOptions: cameraOptions, styleURI: .streets))
mapView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
view.addSubview(mapView)
 
configureLanguageButton()
 
// Allows the delegate to receive information about map events.
mapView.mapboxMap.onMapLoaded.observeNext { _ in
self.finish() // Needed for internal testing purposes.
}.store(in: &cancelables)
}
 
private func configureLanguageButton() {
// Set up layer postion change button
let button = UIButton(type: .system)
button.setTitle("Change Language", for: .normal)
button.setTitleColor(.white, for: .normal)
button.backgroundColor = #colorLiteral(red: 0, green: 0.4784313725, blue: 0.9882352941, alpha: 1)
button.translatesAutoresizingMaskIntoConstraints = false
button.layer.cornerRadius = 20
button.clipsToBounds = true
button.addTarget(self, action: #selector(changeLanguage(sender:)), for: .touchUpInside)
view.addSubview(button)
 
// Set button location
let horizontalConstraint = button.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor, constant: -24)
let verticalConstraint = button.centerXAnchor.constraint(equalTo: view.centerXAnchor)
let widthConstraint = button.widthAnchor.constraint(equalToConstant: 200)
let heightConstraint = button.heightAnchor.constraint(equalToConstant: 40)
NSLayoutConstraint.activate([horizontalConstraint, verticalConstraint, widthConstraint, heightConstraint])
}
 
@objc public func changeLanguage(sender: UIButton) {
let alert = UIAlertController(title: "Languages",
message: "Please select a language to localize to.",
preferredStyle: .actionSheet)
alert.popoverPresentationController?.sourceView = sender
 
alert.addAction(UIAlertAction(title: "Device Locale", style: .default, handler: { [weak self] _ in
do {
try self?.mapView.mapboxMap.localizeLabels(into: Locale.current)
} catch {
print(error)
}
}))
 
alert.addAction(UIAlertAction(title: "Spanish", style: .default, handler: { [weak self] _ in
try! self?.mapView.mapboxMap.localizeLabels(into: Locale(identifier: "es"))
}))
 
alert.addAction(UIAlertAction(title: "French", style: .default, handler: { [weak self] _ in
try! self?.mapView.mapboxMap.localizeLabels(into: Locale(identifier: "fr"))
}))
 
alert.addAction(UIAlertAction(title: "Traditional Chinese", style: .default, handler: { [weak self] _ in
try! self?.mapView.mapboxMap.localizeLabels(into: Locale(identifier: "zh-Hant"))
}))
 
alert.addAction(UIAlertAction(title: "Arabic", style: .default, handler: { [weak self] _ in
try! self?.mapView.mapboxMap.localizeLabels(into: Locale(identifier: "ar"))
}))
 
alert.addAction(UIAlertAction(title: "English", style: .default, handler: { [weak self] _ in
try! self?.mapView.mapboxMap.localizeLabels(into: Locale(identifier: "en"))
}))
 
alert.addAction(UIAlertAction(title: "Japanese - Countries Only", style: .default, handler: { [weak self] _ in
try! self?.mapView.mapboxMap.localizeLabels(into: Locale(identifier: "ja"), forLayerIds: ["country-label"])
}))
 
alert.addAction(UIAlertAction(title: "Cancel", style: .cancel))
 
present(alert, animated: true)
}
}