学步园

为啥要说应用程序自身？因为普通的本地化是根据设备当前的设置来完成的。而实际中一些应用往往需要与设备设置无关的本地化。例如一款游戏在游戏中，玩家可以选择游戏的语言，但是并不会改变所用设备的语言。

近期工作需要，尝试着实现一下这类需求，经测试还能使用，暂且记下，如大家有更好或者更简单的方法还望不吝赐教。

本例为Xcode 4.2版本

一个简易应用程序本地化类：

#import <Foundation/Foundation.h>

@interface XUI_language_Base : NSObject{
    NSBundle    *language_bundle;
    NSString    *language_path;
    NSArray     *language_array;
}

@property (nonatomic,retain)    NSBundle    *language_bundle;
@property (nonatomic,retain)    NSString    *language_path;
@property (nonatomic,retain)    NSArray     *language_array;

-(void)initialize;
-(void)setAppLanguage:(NSString *)language_temp;

-(NSString *)getAppLanguageString:(NSString *)string_key;
-(UIImage *)getAppLanguageImage:(NSString *)imageName;

@end

#import "XUI_language_Base.h"

@implementation XUI_language_Base

@synthesize language_array;
@synthesize language_path;
@synthesize language_bundle;


-(void)dealloc{
    [language_bundle    release];
    [language_array     release];
    [language_path     release];
    
    [super  dealloc];
}


-(void)initialize{
    self.language_array = [ [NSArray alloc] initWithObjects:
                           
                           @"en",
                           @"zh-Hans",
                           
                           nil];
    
    BOOL isLanguageSetted = YES;
    
    //todo get app config find the switch
    //end do
    
    NSString *language_select;
    
    if (isLanguageSetted) {
        // todo get the language of config
        
        language_select = [language_array objectAtIndex:0];
        
        //end do
                
    } else {
        NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; 
        NSArray *languages = [defaults objectForKey:@"AppleLanguages"]; 
        language_select = [languages objectAtIndex:0];
        
        BOOL isSupported = NO;
        //check the language of locale isSupported
        
        for(NSString *lan_temp in language_array){
            if ( [lan_temp isEqualToString:language_select] ) {
                isSupported = YES;
                break;
            }
        }
        
        if ( NO == isSupported ) {
            language_select = [language_array objectAtIndex:0];
        }
    }
    
    self.language_path = [ [NSBundle mainBundle] pathForResource:language_select ofType:@"lproj"];
    
    self.language_bundle = [NSBundle bundleWithPath:self.language_path];
}


-(void)setAppLanguage:(NSString *)language_select{
    BOOL isSupported = NO;
    //check the language of locale isSupported
    
    for(NSString *lan_temp in language_array){
        if ( [lan_temp isEqualToString:language_select] ) {
            isSupported = YES;
            break;
        }
    }
    
    if ( NO == isSupported ) {
        language_select = [language_array objectAtIndex:0];
    }
    
    self.language_path = [ [NSBundle mainBundle] pathForResource:language_select ofType:@"lproj"];  
    
    self.language_bundle = [NSBundle bundleWithPath:self.language_path];  
    
    //todo set the app language and the switch value is yes
    
    //end do
}



-(NSString *)getAppLanguageString:(NSString *)string_key{
    return [self.language_bundle localizedStringForKey:string_key
                                                 value:string_key table:nil];
}



-(UIImage *)getAppLanguageImage:(NSString *)imageName{
    NSString *image_path = [ self.language_bundle pathForResource:imageName ofType:@"png"];
    
    
    // need the name with type
    // NSString *image_path = [ NSString stringWithFormat:@"%@/%@",self.language_path,imageName];
    
    
    NSLog(@"img path %@",image_path);
    
    
    return [UIImage imageWithContentsOfFile:image_path];
}



@end

也许不用实例方法而用 类方法也可以实现一些功能，但个人觉得一些路径存起来用着舒服些。可以在应用初始化创建一个对象，并调用initialize方法。相关配置自行存储于应用程序本地文件，具体实现方法也是各种各样。笔者的项目为程序，一些设置的存取都是调用人家给的接口，即上面的各种todo。另外运行时设置语言后，自然也需要即时处理当前显示内容。

转载请注明来自：http://blog.csdn.net/zhao_yin