[iOS]怎样在iOS开发中切换显示语言实现国际化

1.在Project设置，加入中英两种语言：

2.新建Localizable.strings文件，作为多语言相应的词典，存储多种语言，点击右側Localization，勾选中英：

watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvcGxlYXNlY2FsbG1ld2h5/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast" alt="" />

3.加入一个字段，

在English中，加入："SUBMIT_BTN_TITLE" = "Go";

在Chinese中，加入："SUBMIT_BTN_TITLE" = "開始";

4.一个工具类GDLocalizableController。用来切换本地语言：

//
//  GDLocalizableController.h
//  guide-book
//
//  Created by why on 7/16/14.
//  Copyright (c) 2014 why. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface GDLocalizableController : NSObject

+(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

@end

//
//  GDLocalizableController.m
//  guide-book
//
//  Created by why on 7/16/14.
//  Copyright (c) 2014 why. All rights reserved.
//

#import "GDLocalizableController.h"

@implementation GDLocalizableController

static NSBundle *bundle = nil;

+ ( NSBundle * )bundle{
    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号
        NSArray* languages = [def objectForKey:@"AppleLanguages"];
        NSString *current = [languages objectAtIndex:0];
        string = 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:string ofType:@"lproj"];
    bundle = [NSBundle bundleWithPath:path];//生成bundle
}

+(NSString *)userLanguage{

    NSUserDefaults *def = [NSUserDefaults standardUserDefaults];
    NSString *language = [def valueForKey:@"userLanguage"];
    return language;
}

+(void)setUserlanguage:(NSString *)language{

    NSUserDefaults *def = [NSUserDefaults standardUserDefaults];

    //1.第一步改变bundle的值
    NSString *path = [[NSBundle mainBundle] pathForResource:language ofType:@"lproj" ];
    bundle = [NSBundle bundleWithPath:path];

    //2.持久化
    [def setValue:language forKey:@"userLanguage"];
    [def synchronize];
}

@end

5. 自己定义一个宏方便处理：

// ----- 多语言设置
#define CHINESE @"zh-Hans"
#define ENGLISH @"en"
#define GDLocalizedString(key) [[GDLocalizableController bundle] localizedStringForKey:(key) value:@"" table:nil]

6.使用：

    [GDLocalizableController setUserlanguage:CHINESE];
    NSLog(GDLocalizedString(@"SUBMIT_BTN_TITLE"));
    [GDLocalizableController setUserlanguage:ENGLISH];
    NSLog(GDLocalizedString(@"SUBMIT_BTN_TITLE"));

參考资料：iOS 应用程序内部国际化，不尾随系统语言