LanguageHelper.swift

    import Foundation

struct LanguageHelper {
    
    /// 获取当前系统语言代码 (ISO 639-1)
    static func currentLanguageCode() -> String {
        return Locale.current.language.languageCode?.identifier ?? "未知"
    }
    
    /// 获取当前系统地区 (ISO 3166-1)
    static func currentRegionCode() -> String {
        return Locale.current.region?.identifier ?? "未知"
    }
    
    /// 获取 App 首选语言（取决于 Info.plist 里配置的 Localizations）
    static func appPreferredLanguage() -> String {
        return Bundle.main.preferredLocalizations.first ?? "未知"
    }
    
    /// 获取系统语言优先级列表
    static func systemPreferredLanguages() -> [String] {
        return Locale.preferredLanguages
    }
    
    /// 打印常用信息
    static func debugPrintLanguages() {
        print("🌐 系统语言代码: \(currentLanguageCode())")
        print("📍 系统地区代码: \(currentRegionCode())")
        print("📱 App 首选语言: \(appPreferredLanguage())")
        print("🗂 系统语言优先级列表: \(systemPreferredLanguages())")
    }
}

调用

    LanguageHelper.debugPrintLanguages()

// 也可以单独调用
let lang = LanguageHelper.currentLanguageCode()
let region = LanguageHelper.currentRegionCode()