Runtime language localization in Objective C

Runtime Language Localization

//example of setting run time languages in obj-c
//note that this won't redraw the layout on language change, you have to do that manually
//based on this stack overflow answer:  http://stackoverflow.com/a/23395903/1226668

#import <Foundation/Foundation.h>

#define RUNTIME_LANGUAGE_STORAGE @"runtimeLanguageStorage"
#define RunTimeLanguageEnglish @"en"
#define RunTimeLanguageSpanish @"es"

#undef NSLocalizedString
#define NSLocalizedString(key, comment) [[NSBundle mainBundle] runTimeLocalizedStringForKey:(key) value:@"" table:nil]

#define setLanguage(x) [[NSUserDefaults standardUserDefaults] setObject:x forKey:RUNTIME_LANGUAGE_STORAGE];  [[NSUserDefaults standardUserDefaults] synchronize];

@interface NSBundle (RunTimeLanguage)
- (NSString *)runTimeLocalizedStringForKey:(NSString *)key value:(NSString *)value table:(NSString *)tableName;
@end


#import "NSBundle+RunTimeLanguage.h"
@implementation NSBundle (RunTimeLanguage)

- (NSString *)runTimeLocalizedStringForKey:(NSString *)key value:(NSString *)value table:(NSString *)tableName {
    NSString *languageCode = [[NSUserDefaults standardUserDefaults] objectForKey:RUNTIME_LANGUAGE_STORAGE];
    if ( languageCode == nil ) {
        languageCode = @"en";
    }
    NSString *path= [[NSBundle mainBundle] pathForResource:languageCode ofType:@"lproj"];
    NSBundle *languageBundle = [NSBundle bundleWithPath:path];
    NSString *localizedString=[languageBundle localizedStringForKey:key value:key table:nil];
    return localizedString;
}
@end