iOS 程序内语言切换 -- 中英文切换

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)

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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

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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，

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勾选之后，English.strings中多出了两个文件

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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.文件中添加两个需要的字符串

中文：
"change_language" = "悄悄是别离的笙箫，沉默是今晚的康桥";
"button" = "切换语言";
英文：
"change_language" = "Quietness is my farewell music, silence is Cambridge tonight";
"button" = "Change Language";

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

ChangeLanguage.m
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];
}

6.现在方法已经写完，下面就来检测一下是否好用吧
(1)拖拽storyboard，设置点击事件（storyboard方便，简单）

(2)ViewController.m
- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(changeLanguage) name:@"changeLanguage" object:nil];
    //初始化应用语言
    [ChangeLanguage initUserLanguage];
    NSBundle *bundle = [ChangeLanguage bundle];
    /*
     localizedStringForKey:@"change_language" value:nil table:@"English"
     
     localizedStringForKey:各个语言文件中共同的名称
     table: English.strings 多语言文件夹的名称
     */
    NSString *str = [bundle localizedStringForKey:@"change_language" value:nil table:@"English"];
    NSString *buttonStr = [bundle localizedStringForKey:@"button" value:nil table:@"English"];
    [_changeButton setTitle:buttonStr forState:UIControlStateNormal];
    _languageLabel.text = str;
    
}
//切换语言的点击方法
- (IBAction)change:(id)sender {
    //修改语言
    NSString *language = [ChangeLanguage userLanguage];
    if ([language isEqualToString:@"en"]) {
        [ChangeLanguage setUserlanguage:@"zh-Hans"];
    }else{
        [ChangeLanguage setUserlanguage:@"en"];
    }
    
    [[NSNotificationCenter defaultCenter] postNotificationName:@"changeLanguage" object:self];
}

//点击改变语言，代理方法刷新界面
- (void)changeLanguage{
    [_changeButton setTitle:[[ChangeLanguage bundle] localizedStringForKey:@"button" value:nil table:@"English"] forState:UIControlStateNormal];
    _languageLabel.text =[[ChangeLanguage bundle] localizedStringForKey:@"change_language" value:nil table:@"English"];
}
//适当的位置移除通知
- (void)dealloc{
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

7.下面就来两张运行的界面界面吧

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语言切换成功之后，推出程序重新运行就可以看到保留了上次选择的语言。。

转载：http://blog.csdn.net/ywm04050712/article/details/53319464
http://blog.csdn.net/jackjia2015/article/details/51554375
http://www.cocoachina.com/ios/20150114/10911.html
http://www.jianshu.com/p/627da5a9992c
http://www.jianshu.com/p/c7e8e999c8c7