[iOS]怎样在iOS开发中切换显示语言实现国际化

//
//  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