添加語言庫

• 點擊項目 -> PROJECT -> Info -> Localizations -> + , 添加需要的語言;

• 添加完成的語言庫如下所示:

• 創建Localizable.strings

• 然后選擇新創建的 Localizable.string, 選中所需要的語言;

Localizable.strings 文件寫入

• 添加語言庫成功之后, Localizable.strings就生成了English、Chinese Simplified、Chinese Traditional三個語言文件;
• Localizable.strings 文件中寫入, 以"key" = “value”; 這樣的格式;
• English:

INTERNATIONALIZATION = "Internationalization"; CHANGE = "switch"; HANDSOME = "Handsome Boy";

• Chinese Simplified

INTERNATIONALIZATION = "國際化"; CHANGE = "切換"; HANDSOME = "帥哥";

• Chinese Traditional

INTERNATIONALIZATION = "國際化"; CHANGE = "切換"; HANDSOME = "帥哥";

YDWLocalizationHelper

該工具類可以直接拖入工程中使用, 主要實現功能:

• 第一次進入App時, 自動根據系統的語言設定當前App的語言;
• 保存當前用戶設定的語言;
• 自定義切換語言功能;
• 控件賦值的獲取和設定;
• 切換語言后替換掉mainBundle為當前語言的bundle;

import UIKitclass YDWLocalizationHelper: NSObject {fileprivate static let kSharedSettingsKey = "DefaultUserSettings"var language: Languageenum Language: String {case Chinese = "zh-Hans"case English = "en"case Tradition = "zh-Hant"case Vietnamese = "vi"var code: String {return rawValue}}// MARK: 創建單例static let shared: YDWLocalizationHelper = {let appSettings: YDWLocalizationHelperif let savedData = UserDefaults.standard.object(forKey: YDWLocalizationHelper.kSharedSettingsKey) as? Data,let defaultSettings = NSKeyedUnarchiver.unarchiveObject(with: savedData) as? YDWLocalizationHelper {appSettings = defaultSettings} else {appSettings = YDWLocalizationHelper()}return appSettings}()// MARK: 獲取鍵值func valueWithKey(key: String!) -> String {let str = NSLocalizedString(key, comment: "")return str}// MARK: - 保存用戶當前語言static func saveSharedInstance() {let data = NSKeyedArchiver.archivedData(withRootObject: YDWLocalizationHelper.shared)UserDefaults.standard.set(data, forKey: YDWLocalizationHelper.kSharedSettingsKey)}static func localeIsChinese() -> Language {if let lang = Locale.preferredLanguages.first {if lang.hasPrefix("zh") {if lang.contains("Hant") || lang.contains("Trad") {return .Tradition}return .Chinese} else if lang.contains("en") {return .English} else if lang.hasPrefix("viet") {return .Vietnamese} else {return .English}} else {return .English}}// MARK: 首次進入語言override init() {language = YDWLocalizationHelper.localeIsChinese()super.init()}}private var bundleByLanguageCode: [String: Foundation.Bundle] = [:]extension YDWLocalizationHelper.Language {var bundle: Foundation.Bundle? {if let bundle = bundleByLanguageCode[code] {return bundle} else {let mainBundle = Foundation.Bundle.mainif let path = mainBundle.path(forResource: code, ofType: "lproj"),let bundle = Foundation.Bundle(path: path) {bundleByLanguageCode[code] = bundlereturn bundle} else {return nil}}} }// 當調用YDWLocalizationHelper.Language切換語言后替換掉mainBundle為當前語言的bundle class Bundle: Foundation.Bundle {override func localizedString(forKey key: String, value: String?, table tableName: String?) -> String {if let bundle = YDWLocalizationHelper.shared.language.bundle {return bundle.localizedString(forKey: key, value: value, table: tableName)} else {return super.localizedString(forKey: key, value: value, table: tableName)}} }

語言切換

• AppDelegate中: object_setClass(Foundation.Bundle.main, Bundle.self)

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {object_setClass(Foundation.Bundle.main, Bundle.self)return true}

• 使用:設定時只需要在控件上, 通過YDWLocalizationHelper.shared.valueWithKey(key: “INTERNATIONALIZATION”)來設定即可; 而切換語言只需要通過設定YDWLocalizationHelper.shared.language = .Chinese即可;(其中valueWithKey和YDWLocalizationHelper.shared.language實現如下)

// comment 是傳參, 假如value中需要外界來決定內容,可以用%@,然后comment傳參func valueWithKey(key: String!) -> String {let str = NSLocalizedString(key, comment: "")return str}// 切換語言時,只要設置就可以:YDWLocalizationHelper.shared.language = .Chinese // .Chinese

• 最后重載RootViewController即可:

let appDelegate = UIApplication.shared.delegate as! AppDelegateappDelegate.setupRootViewController()

• 對于story 中的國際化, 需要重設一下RootViewController

func resetRootViewController() {if let appdelegate = UIApplication.shared.delegate {let storyBoard = UIStoryboard.init(name: "Main", bundle: nil)if let mainController = storyBoard.instantiateViewController(withIdentifier: "rootViewController") as? UINavigationController {appdelegate.window??.rootViewController = mainController}}}

刷新界面

對于所有界面的刷新最方便的就是重新設置 rootViewController, 將keyWindow先變黑，假裝loading個幾秒，再變回來即可。如果需要再次回到之前所在頁面，再添加相應的跳轉VC的方法;

func chooseLanguage(menu: [String : Any]) {let language = menu["language"] as! Stringvar noticeContent = "正在設置語言..."if language == "中文(簡體)" {noticeContent = "正在設置語言..."YDWLocalizationHelper.shared.language = .Chinese} else if language == "中文(繁體)" {noticeContent = "正在設置語言..."YDWLocalizationHelper.shared.language = .Tradition} else if language == "English" {noticeContent = "Setting Language..."YDWLocalizationHelper.shared.language = .English} else if language == "Ti?ng Vi?t" {noticeContent = "Thi?t l?p ng?n ng?..."YDWLocalizationHelper.shared.language = .Vietnamese} else {noticeContent = "正在設置語言..."YDWLocalizationHelper.shared.language = .Chinese}if UIApplication.shared.delegate != nil {let appDelegate = UIApplication.shared.delegate as! AppDelegateappDelegate.setupRootViewController()}let backView = UIView(frame: UIScreen.main.bounds)backView.backgroundColor = .blackUIApplication.shared.keyWindow?.addSubview(backView)YDWToast.showToast(text: noticeContent, duration: 2, location: .center)DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 2) {UIView.animate(withDuration: 0.2, animations: {backView.alpha = 0}) { (isFinished) inbackView.removeFromSuperview()}}}

效果展示

完整示例

Swift之Internationalization本地國際化和App內切換語言

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