如何在swift 5中更改应用程序中的语言(本地化)

Question

我正在尝试本地化Swift 5中开发的iOS应用程序。我已经完成了代码和故事板中的所有本地化工作。但当我点击语言按钮时，我不知道如何在应用程序中更改语言。

是否可以在应用程序中更改应用程序语言？如果是如何？

请建议进行相同的最佳方法

Answer 1

我刚刚做了一个类似的实现。很高兴你问我，我看到了。这是我的实现。您可以修改。

enum Language: String, CaseIterable {
case english, german
var code: String {
switch self {
case .english: return "en"
case .german: return "de"
}
}
static var selected: Language {
set {
UserDefaults.standard.set([newValue.code], forKey: "AppleLanguages")
UserDefaults.standard.set(newValue.rawValue, forKey: "language")
}
get {
return Language(rawValue: UserDefaults.standard.string(forKey: "language") ?? "") ?? .english
}
}
static func switchLanguageBetweenEnglishAndGerman() {
selected = selected == .english ? .german : .english
}
}

现在您只需要调用Language.selected == .german并重新加载视图。

Answer 2

更改整个应用程序的本地化。为此，您需要按照以下步骤操作。

为每个UIViewController创建一个Parent类，并定义setupLocasitation方法以供进一步使用。

ParentViewController.swift

class ParentViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
func setupLocasitation(){
}
}

UIViewController的所有其他类都应该是ParentViewController的子类，并覆盖setupLocasitation方法

ViewController1.swift

class ViewController1: ParentViewController {
override func viewDidLoad() {
super.viewDidLoad()
setupLocasitation()
}
override func setupLocasitation() {
super.setupLocasitation()
print("Your localisation specifi code here...")
}
}

ViewController2.swift

class ViewController2: ParentViewController {
override func viewDidLoad() {
super.viewDidLoad()
setupLocasitation()            
}
override func setupLocasitation() {
super.setupLocasitation()
print("Your localisation specifi code here...")
}   
}

更改语言VC.swift

您需要获取ParentViewController的所有实例，并强制完全调用setupLocasitation方法。

class ChangeLanguageVC: ParentViewController {
override func viewDidLoad() {
super.viewDidLoad()
setupLocasitation()
}
@IBAction func btnChangeLanguageTap(){
//Code for your language changes here...
let viewControllers = self.navigationController?.viewControllers ?? []
for vc in viewControllers{
if let parent = vc as? ParentViewController{
parent.setupLocasitation()
}
}
}
}

Answer 3

//
//  LanguageExtensions.swift
//  Flourish
//
//  Created by Janko on 11/11/2020.
//
import Foundation
import UIKit
let languageKey = "languageKey"
var language : Int {
switch UserDefaults.standard.string(forKey: languageKey) {
case "en":
return 0
case "dutch":
return 1
default:
return 0
}
}
extension String {
func localizedLanguage()->String?{
var defaultLanguage = "en"
if let selectedLanguage = UserDefaults.standard.string(forKey: languageKey){
defaultLanguage = selectedLanguage
}
return NSLocalizedString(self, tableName: defaultLanguage, comment: "")
}
}

class LanguageLabel: UILabel{
required init?(coder: NSCoder) {
super.init(coder: coder)
NotificationCenter.default.addObserver(self, selector: #selector(updateUI), name: AppNotification.changeLanguage, object: nil)
}
@IBInspectable var localizedLanguage: String? {
didSet{
updateUI()
}
}
@objc func updateUI(){
if let string = localizedLanguage {
text = string.localizedLanguage()
}
}
}
class LanguageButton: UIButton{
required init?(coder: NSCoder) {
super.init(coder: coder)
NotificationCenter.default.addObserver(self, selector: #selector(updateUI), name: AppNotification.changeLanguage, object: nil)
}
@IBInspectable var localizedLanguage: String? {
didSet{
updateUI()
}
}
@objc func updateUI(){
if let string = localizedLanguage {
setTitle(string.localizedLanguage(), for: .normal)
}
}
}
struct AppNotification{
static  let changeLanguage = Notification.Name("changeLanguage")
}
extension UIViewController{
func changeLanguage(){
let alert = UIAlertController(title: "Change Language", message: "Change it", preferredStyle: .alert)
let actionEnglish = UIAlertAction(title: "English", style: .default) { (action) in
UserDefaults.standard.setValue("en", forKey: languageKey)
NotificationCenter.default.post(name: AppNotification.changeLanguage , object: nil)
}
let actionMontenegrin = UIAlertAction(title: "Montenegrinish", style: .default) { (action) in
UserDefaults.standard.setValue("dutch", forKey: languageKey)
NotificationCenter.default.post(name: AppNotification.changeLanguage , object: nil)
}
alert.addAction(actionEnglish)
alert.addAction(actionMontenegrin)
present(alert, animated: true, completion: nil)
}
}