iOS--App应用内切换语言

核心方法：

#define NSLocalizedStringFromTableInBundle(key, tbl, bundle, comment) 
        [bundle localizedStringForKey:(key) value:@"" table:(tbl)]

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

2.右侧菜单栏点击Localize，弹出菜单选择English，确定

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.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

 

英文文件中：

"12hour" = "12-Hour Time";
"24hour" = "24-Hour Time";
"am" = "AM";
"pm" = "PM";

中文文件中

"12hour" = "12小时制";
"24hour" = "24小时制";
"am" = "上午";
"pm" = "下午";

5.新建一个单例类，ChangeLanguage，.h中添加属性方法

#import <Foundation/Foundation.h>

//app应用内切换语言
#define HLLocalizedString(key, tbl) [LocalizationManager getStringForKey:key withTable:tbl]

//#define HLLocalizedString(key, tbl) NSLocalizedString(key, tbl)

@interface LocalizationManager : NSObject

/// 获取当前资源文件
+ (NSBundle *)bundle;
/// 初始化语言文件
+ (void)initUserLanguage;
/// 获取应用当前语言
+ (NSString *)userLanguage;
/// 设置当前语言
+ (void)setUserlanguage:(NSString *)language;
/// 通过Key获得对应的string
+ (NSString *)getStringByKey:(NSString *)key;

+ (NSString *)getStringForKey:(NSString *)key withTable:(NSString *)table;
@end

6.在.m中实现方法

#import "LocalizationManager.h"
#import "AppDelegate.h"



@implementation LocalizationManager
static NSString *TableName = @"localization";
static NSBundle *bundle = nil;
static NSString *UserLanguage = @"UserLanguage";

+ (NSBundle *)bundle
{
    if(!bundle)
    {
        [self initUserLanguage];
    }
    return bundle;
}

+ (void)initUserLanguage{
    NSUserDefaults *def = [NSUserDefaults standardUserDefaults];
    NSString *string = [def valueForKey:UserLanguage];
    if(string.length == 0)
    {
        //获取系统当前语言版本(中文zh-Hans,英文en)
        NSArray *languages = [NSLocale preferredLanguages];
        
        NSString *current = [languages objectAtIndex:0];
        string = [self languageFormat:current];
        [def setValue:current forKey:UserLanguage];
        [def synchronize];//持久化，不加的话不会保存
    }
    
    //获取文件路径
    NSString *path = [[NSBundle mainBundle] pathForResource:[self languageFormat:string] ofType:@"lproj"];
    
    bundle = [NSBundle bundleWithPath:path];//生成bundle
}

+ (void)setUserlanguage:(NSString *)language{
    
    NSUserDefaults *def = [NSUserDefaults standardUserDefaults];
    
    //1.第一步改变bundle的值
    NSString *path = [[NSBundle mainBundle] pathForResource:[self languageFormat:language] ofType:@"lproj" ];
    
    bundle = [NSBundle bundleWithPath:path];
    
    //2.持久化
    [def setValue:language forKey:UserLanguage];
    
    [def synchronize];
    [self resetRootViewController];
}

+ (NSString *)userLanguage
{
    NSString *userLanguage = [[NSUserDefaults standardUserDefaults] objectForKey:UserLanguage];
    return userLanguage;
}

+ (NSString *)getStringByKey:(NSString *)key
{
    return [[LocalizationManager bundle] localizedStringForKey:key value:nil table:TableName];
}

///语言和语言对应的.lproj的文件夹前缀不一致时在这里做处理
+ (NSString *)languageFormat:(NSString*)language {
    if([language rangeOfString:@"zh-Hans"].location != NSNotFound)
    {
        return @"zh-Hans";
    }
    else if([language rangeOfString:@"zh-Hant"].location != NSNotFound)
    {
        return @"zh-Hant";
    }
    else
    {
        //字符串查找
        if([language rangeOfString:@"-"].location != NSNotFound) {
            //除了中文以外的其他语言统一处理@"ru_RU" @"ko_KR"取前面一部分
            NSArray *ary = [language componentsSeparatedByString:@"-"];
            if (ary.count > 1) {
                NSString *str = ary[0];
                return str;
            }
        }
    }
    return language;
}


+ (NSString *)getStringForKey:(NSString *)key withTable:(NSString *)table
{
    if ([LocalizationManager bundle])
    {
        return NSLocalizedStringFromTableInBundle(key, table, [LocalizationManager bundle], @"");
    }

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

//重新设置
+ (void)resetRootViewController
{
    AppDelegate *delegate = [AppDelegate getAPPDelegate];
    [delegate initTabbarCV];

}
@end

7：使用

#切换时使用 
if([[LocalizationManager userLanguage] isEqualToString:@"en"])
        {
            [LocalizationManager setUserlanguage:@"zh-Hans"];
            
        }
        else
        {
            [LocalizationManager setUserlanguage:@"en"];
            
        }



#注意，多语言的地方需要使用如下定义才有效

HLLocalizedString(@"Setlang", nil)