iOS - 多语言工具类

iOS App本地化，多语言工具类

//
//  LanguageManager.swift
//  InledcoLightSwift
//
//  语言工具类
//
//  Created by huang zhengguo on 2017/10/12.
//  Copyright © 2017年 huang zhengguo. All rights reserved.
//

import UIKit

class LanguageManager {
    
    // 语言列表定义
    enum LanguageFlag: String {
        case auto = "auto"          // 自动，跟随系统
        case english = "en"         // 英文
        case chinese = "zh-Hans"    // 中文
    }
    
    // 语言文件
    static private let languageFile = ""
    // 用户保存标记
    static private var languageFilePath: String?
    static private var bundle: Bundle?
    static private var currentLanguageFlag: LanguageFlag! = .auto
    static private let userLangDefineFlag: String = "USERLANGUAGEFLAG"
    
    /// 根据键获取对应语言文本
    /// - parameter key: 键值
    ///
    /// - returns: 键值对应的文本
    class func getValueForKey(key: String) -> String {
        let language = LanguageFlag.chinese
        
        self.languageFilePath = Bundle.main.path(forResource: language.rawValue, ofType: "lproj")
        self.bundle = Bundle.init(path: self.languageFilePath!)
        
        if self.bundle != nil {
            return (self.bundle?.localizedString(forKey: key, value: nil, table: self.languageFile))!
        }
        
        return Bundle.main.localizedString(forKey: key, value: nil, table: self.languageFile)
    }
    
    /// 获取当前语言标记
    ///
    /// - returns: 当前语言标记
    static func getCurrentLanguageFlag() -> LanguageFlag! {
        let languageStr = UserDefaults.standard.object(forKey: self.userLangDefineFlag) as? String
        switch languageStr {
        case LanguageFlag.auto.rawValue?:
            return LanguageFlag.auto
        case LanguageFlag.english.rawValue?:
            return LanguageFlag.english
        case LanguageFlag.chinese.rawValue?:
            return LanguageFlag.chinese
        default:
            return LanguageFlag.auto
        }
    }
    
    /// 设置语言
    /// - parameter language: 表示语言的枚举
    ///
    /// - returns: void
    class func setLanguage(language: LanguageFlag!) -> Void {
        // 1.如果用户设置和当前设置相同，则直接返回
        if language == self.currentLanguageFlag {
            return
        }
        
        // 2.如果不同，则设置新语言
        if language.rawValue == LanguageFlag.auto.rawValue {
            // 如果选择的是自动，则删除用户的设置
            UserDefaults.standard.removeObject(forKey: self.userLangDefineFlag)
            self.languageFilePath = nil
            self.bundle = nil
        } else {
            // 获取语言文件
            self.languageFilePath = Bundle.main.path(forResource: language.rawValue, ofType: "lproj")
            self.bundle = Bundle.init(path: self.languageFilePath!)
            // 存储到本地
            UserDefaults.standard.setValue(language.rawValue, forKey: self.userLangDefineFlag)
        }
        
        // 3.重新获取当前设置
        self.currentLanguageFlag = self.getCurrentLanguageFlag()
    }
}