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【iOS】Swift国际化语言切换方案的最佳实现

【iOS】Swift国际化语言切换方案的最佳实现

作者: 雨影 | 来源:发表于2020-06-10 15:22 被阅读0次

    直接上代码:

    1、实现对String的国际化扩展

    public extension String {
    
        /// 国际化扩展
        var localized: String {
            LanguageManager.shared.localize(string: self, bundle: Bundle.main)
        }
    
        /// 带参数的国际化
        func localized(_ arguments: CVarArg...) -> String {
            LanguageManager.shared.localize(string: self, bundle: Bundle.main, arguments: arguments)
        }
    }
    
    

    2、语言管理

    public class LanguageManager {
        public static let shared = LanguageManager()
        private static let userDefaultsKey = "current_language"
        private static let defautLanguage = "en"
    
        init() {
            currentLanguage = LanguageManager.storedCurrentLanguage ?? LanguageManager.defautLanguage
        }
    
        /// 可用的语言
        public static var availableLanguages: [String] {
            Bundle.main.localizations.sorted()
        }
    
        /// 当前语言
        public var currentLanguage: String {
            didSet {
                storeCurrentLanguage()
            }
        }
    
        /// 当前语言展示的名字
        public var currentLanguageDisplayName: String? {
            displayName(language: currentLanguage)
        }
    
        /// 根据语言国际化展示的名字
        public func displayName(language: String) -> String? {
            (currentLocale as NSLocale).displayName(forKey: NSLocale.Key.identifier, value: language)?.capitalized
        }
        /// 原始语言显示名称
        public static func nativeDisplayName(language: String) -> String? {
            let locale = NSLocale(localeIdentifier: language)
            return locale.displayName(forKey: NSLocale.Key.identifier, value: language)?.capitalized
        }
    }
    
    extension LanguageManager {
    
        /// 存储当前语言
        private func storeCurrentLanguage() {
            UserDefaults.standard.set(currentLanguage, forKey: LanguageManager.userDefaultsKey)
        }
    
        /// 获取存设置的语言
        private static var storedCurrentLanguage: String? {
            UserDefaults.standard.value(forKey: userDefaultsKey) as? String
        }
    
        /// 推荐语言
        private static var preferredLanguage: String? {
            Bundle.main.preferredLocalizations.first { availableLanguages.contains($0) }
        }
    }
    
    extension LanguageManager {
    
        public var currentLocale: Locale {
            Locale(identifier: currentLanguage)
        }
    }
    
    extension LanguageManager {
    
        public func localize(string: String, bundle: Bundle?) -> String {
            if let languageBundleUrl = bundle?.url(forResource: currentLanguage, withExtension: "lproj"), let languageBundle = Bundle(url: languageBundleUrl) {
                return languageBundle.localizedString(forKey: string, value: nil, table: nil)
            }
    
            return string
        }
    
        public func localize(string: String, bundle: Bundle?, arguments: [CVarArg]) -> String {
            String(format: localize(string: string, bundle: bundle), locale: currentLocale, arguments: arguments)
        }
    }
    
    

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