随着时代的发展，应用程序相继出现了不同语言的版本方案，中文，英文，法文，韩文等等；想在应用程序中实现语言的*切换，需要配置多个语言的文件，根据用户的动态选择获取不同语言文件下的语言文件，从而显示到界面上面。这里先说中英文的切换，至于其他语言操作复制即可！！！
1.新建工程之类的就不用说了，配置项目本地化支持简体中文和英文
工程-PROJECT-info->Localizations，点“+”，选择（Chinese(Simplified)）添加简体中文，英文Xcode自带有（English），所以不需要再次添加。(点击添加弹出语言菜单，即可选择你所需要的语言)
2.现在可以添加多语言文件了。
注意：需要手动切换语言，而不是根据系统语言变换，所以命名不能与系统语言文件同名，即Localizable.strings；
自己随意命名，后缀是.strings，一定要记得Targets要勾选项目
3.配置English.strings本地化，现在支持中文和英文。
(1)选中English.strings文件，查看右边栏中的信息；(2)点击Localization中的按钮，弹出框中显示出前面添加的语言；(3)选择中文和英文，base选项可有可无，
勾选之后，English.strings中多出了两个文件
完成之后便是完成了项目内多语言环境的配置，下面看一下这两个文件中应该怎样写
4.文件中添加需要的字符串
中文：
"AirLeak" = "漏气";
"AppUseDes" = "APP使用说明";
"AutoBind" = "自动绑定";
"AutoBindNewDevice" = "自动绑定";
"BackToDefaultSet" = "恢复默认设置";
"BatteryAlertDown" = "电量警报下限";
"BindNewDevice" = "绑定新设备";
"BleOpen" = "蓝牙开启";
"Cancel" = "取消";
"DeviceHasBeenBD" = "设备已经被绑定";
"DeviceInstallDes" = "设备安装说明";
"Ensure" = "确定";
"FindNewDevice" = "发现新版本";
"HighTempreture" = "温度过高";
"Help" = "帮助";
"HighPressure" = "气压过高";
"Home" = "首页";
"InputRightCode" = "请输入正确的编号";
"InputWheelCode" = "请输入轮胎编码\n(由0-9，a-f，A-F组成)";
"LowBattery" = "电量低";
"LowPressure" = "气压低";
"ManualBindNewDevice" = "手动绑定";
"ManualBind" = "手动绑定";
"PleaseBindDevice" = "请绑定设备";
"PleaseOpenBle" = "请打开蓝牙";
"PressureAlertDown" = "压力警告下限";
"PressureAlertUpper" = "压力警告上限";
"PressureUnint" = "压力单位";
"Searching" = "搜索中";
"SharkAlert" = "震动报警";
"SystemSet" = "系统设置";
"TempretureAlertUpper" = "温度警告上限";
"TempretureUnint" = "温度单位";
"LeftUpWheel" = "左前轮胎";
"RightUpWheel" = "右前轮胎";
"LeftDownWheel" = "左后轮胎";
"RightDownWheel" = "右后轮胎";
"RotationType" = "调胎";
"ScanAndScan" = "扫一扫";//扫一扫
"AlbumLab" = "相册";
"ChooseQRCodePic" = "请选择二维码图片";
"ChooseSure" = "确认";
"ScanCodeSuccess" = "扫码绑定成功";//扫码绑定成功
"ScanRepeat" = "请重新扫描";//请重新扫描
"ScanBind" = "扫码绑定";//扫码绑定
"AirLeak" = "Air leak";
"AppUseDes" = "app use manual";
"AutoBind" = "Auto bind";
"AutoBindNewDevice" = "Auto bind";
"BackToDefaultSet" = "Restore default setting";
"BatteryAlertDown" = "Minimum alert battery";
"BindNewDevice" = "Bind new sensor";
"BleOpen" = "Ble enabled";
"Cancel" = "Cancel";
"DeviceHasBeenBD" = "Device has been bound";
"DeviceInstallDes" = "device install instructions";
"Ensure" = "Ok";
"FindNewDevice" = "New version";
"HighTempreture" = "High temperature";
"Help" = "Help";
"HighPressure" = "High pressure";
"Home" = "Home";
"InputRightCode" = "Input correct code";
"InputWheelCode" = "Input wheel code";
"LowBattery" = "Low battery ";
"LowPressure" = "Low pressure";
"ManualBindNewDevice" = "Manual bind";
"ManualBind" = "manual bind";
"PleaseBindDevice" = "Please bind sensor";
"PleaseOpenBle" = "Enable ble";
"PressureAlertDown" = "Minimum alert pressure";
"PressureAlertUpper" = "Maximum alert pressure";
"PressureUnint" = "Pressure unit ";
"Searching" = "Searching";
"SharkAlert" = "Vibration alert";
"SystemSet" = "System setting";
"TempretureAlertUpper" = "Maximum alert temperature";
"TempretureUnint" = "Temperature unit";
"LeftUpWheel" = "Left up wheal";
"RightUpWheel" = "Right up wheal";
"LeftDownWheel" = "Left down Wheal";
"RightDownWheel" = "Right down wheal";
"RotationType" = "Tyre rotation";
"ScanAndScan" = "Scan";//扫一扫
"AlbumLab" = "Album";
"ChooseQRCodePic" = "Please choose a pic of QRCode";
"ChooseSure" = "sure";
"ScanCodeSuccess" = "Scan success";//扫码绑定成功
"ScanRepeat" = "Scan repeat";//请重新扫描
"ScanBind" = "Scan bind";//扫码绑定
5.配置环境已经完成，现在看看代码怎么写？？？？
（1）新创建工具类，继承自NSObject(在这里我命名为ChangeLanguage)
（2）ChangeLanguage.h
+(NSBundle *)bundle;//获取当前资源文件
+(void)initUserLanguage;//初始化语言文件
+(NSString *)userLanguage;//获取应用当前语言
+(void)setUserlanguage:(NSString *)language;//设置当前语言
static NSBundle *bundle = nil;
+ ( NSBundle * )bundle{
return bundle;
}
//首次加载的时候先检测语言是否存在
+(void)initUserLanguage{
NSUserDefaults *def = [NSUserDefaults standardUserDefaults];
NSString *currLanguage = [def valueForKey:LocalLanguageKey];
if(!currLanguage){
NSArray *preferredLanguages = [NSLocale preferredLanguages];
currLanguage = preferredLanguages[0];
if ([currLanguage hasPrefix:@"en"]) {
currLanguage = @"en";
}else if ([currLanguage hasPrefix:@"zh"]) {
currLanguage = @"zh-Hans";
}else currLanguage = @"en";
[def setValue:currLanguage forKey:LocalLanguageKey];
[def synchronize];
}
//获取文件路径
NSString *path = [[NSBundle mainBundle] pathForResource:currLanguage ofType:@"lproj"];
bundle = [NSBundle bundleWithPath:path];//生成bundle
}
//获取当前语言
+(NSString *)userLanguage{
NSUserDefaults *def = [NSUserDefaults standardUserDefaults];
NSString *language = [def valueForKey:LocalLanguageKey];
return language;
}
//设置语言+(void)setUserlanguage:(NSString *)language{
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
NSString *currLanguage = [userDefaults valueForKey:LocalLanguageKey];
if ([currLanguage isEqualToString:language]) {
return;
}
[userDefaults setValue:language forKey:LocalLanguageKey];
[userDefaults synchronize];
NSString *path = [[NSBundle mainBundle] pathForResource:language ofType:@"lproj" ];
bundle = [NSBundle bundleWithPath:path];
}