本文主要针对APP国际化进行操作，使APP内部控件显示语言可以不随系统语言做改变，自由切换.

效果如下：

Language.gif

核心方法：

NSLocalizedStringFromTable(, , )

原理即在工程内部建立 .String，在内部采用键值对方式对所需要切换语言的文字进行赋值

1.工程内部创建.String文件，命名为Language.String

1.png

2.右侧菜单栏点击Localize，弹出菜单选择English，确定

2.png

3.png

3.第二步结束后选择工程，选择PROJECT，下方Localizations菜单中点击+号选择添加中文

4.png

4.此时Language.String中会显示两个文件，Language.String(Chinese) 和 Language.String(English)，这一步像这两个文件中添加键值对

5.png

英文文件中：

"denglu" = "Login";

"account" = "Phone number/email address";

"password" = "Password";

"verification" = "Verification code";

"message" = "SMS verification code";

"forget" = "Forget?";

"newregist" = "Registration";

"question" = "Problems";

中文文件中

"denglu" = "登录";

"account" = "请输入手机号/邮箱";

"password" = "请输入登录密码";

"verification" = "请输入验证码";

"message" = "通过短信验证码登录";

"forget" = "忘记密码？";

"newregist" = "新用户注册";

"question" = "常见问题";

5.新建一个单例类，ChangeLanguage，.h中添加属性方法

#import

@interface ChangeLanguage : NSObject

#define FGGetStringWithKeyFromTable(key, tbl) [[ChangeLanguage sharedInstance] getStringForKey:key withTable:tbl]

@property(nonatomic, strong)NSString *language;

+(id)sharedInstance;

/**

* 返回table中指定的key的值

*

* @param key key

* @param table table

*

* @return 返回table中指定的key的值

*/

-(NSString *)getStringForKey:(NSString *)key withTable:(NSString *)table;

/**

* 改变当前语言

*/

-(void)changeNowLanguage;

/**

* 设置新的语言

*

* @param language 新语言

*/

-(void)setNewLanguage:(NSString*)language;

@end

6.在.m中实现方法

#import "ChangeLanguage.h"

#import "AppDelegate.h"

#define CNS @"zh-Hans"

#define EN @"en"

#define LANGUAGE_SET @"langeuageset"

@interface ChangeLanguage()

@property(nonatomic,strong)NSBundle *bundle;

@end

@implementation ChangeLanguage

static ChangeLanguage *sharedModel;

+(id)sharedInstance

{

if (!sharedModel)

{

sharedModel = [[ChangeLanguage alloc]init];

}

return sharedModel;

}

-(instancetype)init

{

self = [super init];

if (self)

{

[self initLanguage];

}

return self;

}

-(void)initLanguage

{

NSString *tmp = [[NSUserDefaults standardUserDefaults]objectForKey:LANGUAGE_SET];

NSString *path;

//默认是中文

if ([tmp isEqualToString:CNS] || !tmp)

{

tmp = CNS;

}

else

{

tmp = EN;

}

self.language = tmp;//更改之前语言

path = [[NSBundle mainBundle]pathForResource:self.language ofType:@"lproj"];

self.bundle = [NSBundle bundleWithPath:path];

}

- (NSString *)getStringForKey:(NSString *)key withTable:(NSString *)table

{

if (self.bundle)

{

return NSLocalizedStringFromTableInBundle(key, table, self.bundle, @"");

}

return NSLocalizedStringFromTable(key, table, @"");

}

- (void)changeNowLanguage

{

if ([self.language isEqualToString:EN])

{

[self setNewLanguage:CNS];

}

else

{

[self setNewLanguage:EN];

}

}

-(void)setNewLanguage:(NSString *)language

{

if ([language isEqualToString:self.language])

{

return;

}

//找到需要改成的语言路径

if ([language isEqualToString:EN] || [language isEqualToString:CNS])

{

NSString *path = [[NSBundle mainBundle] pathForResource:language ofType:@"lproj"];

self.bundle = [NSBundle bundleWithPath:path];

}

self.language = language;

NSLog(@"%@", language);

[[NSUserDefaults standardUserDefaults]setObject:language forKey:LANGUAGE_SET];

[[NSUserDefaults standardUserDefaults]synchronize];

[self resetRootViewController];

}

//重新设置

-(void)resetRootViewController

{

AppDelegate *appDelegate =

(AppDelegate *)[[UIApplication sharedApplication] delegate];

UIStoryboard *SB = [UIStoryboard storyboardWithName:@"Main" bundle:nil];

UITabBarController *tabBarController = [SB instantiateViewControllerWithIdentifier:@"tabBarController"];

tabBarController = (UITabBarController*)appDelegate.window.rootViewController;

}

@end

7.具体使用：在具体方法中先调用changeNowLanguage方法，然后用FGGetStringWithKeyFromTable赋值即可；