How to localize text based on criterion other than language

Question

I have an application which will be marketed in different European countries. We\'ve gone through the process of localizing the application so that its strings are maintained i

Answer 1

Define two bundles on a singleton, fallback and preferred...

#import <Foundation/Foundation.h>

@interface Localization : NSObject

@property (nonatomic, retain) NSString* fallbackCountry;
@property (nonatomic, retain) NSString* preferredCountry;

@property (nonatomic, retain) NSDictionary* fallbackCountryBundle;
@property (nonatomic, retain) NSDictionary* preferredCountryBundle;

+(Localization *)sharedInstance;
- (NSString*) countryStringForKey:(NSString*)key;

@end


#import "Localization.h"

@implementation Localization

@synthesize fallbackCountryBundle, preferredCountryBundle;
@synthesize fallbackCountry, preferredCountry;

+(Localization *)sharedInstance 
{
    static dispatch_once_t pred;
    static Localization *shared = nil;
    dispatch_once(&pred, ^{
        shared = [[Localization alloc] init];

        [shared setFallbackCountry:@"country-ES"];

        NSLocale *locale = [NSLocale currentLocale];
        NSString *countryCode = [locale objectForKey:NSLocaleCountryCode];
        [shared setPreferredCountry:[NSString stringWithFormat:@"country-%@",countryCode]];
    });
    return shared;
}


-(void) setFallbackCountry:(NSString*)country
{
    NSString *bundlePath = [[NSBundle mainBundle] pathForResource:country ofType:@"strings"];
    self.fallbackCountryBundle = [NSDictionary dictionaryWithContentsOfFile:bundlePath];
    trace(@"Fallback: %@ %@",[bundlePath lastPathComponent], self.fallbackCountryBundle);
}


-(void) setPreferredCountry:(NSString*)country 
{
    NSString *bundlePath = [[NSBundle mainBundle] pathForResource:country ofType:@"strings"];
    self.preferredCountryBundle = [NSDictionary dictionaryWithContentsOfFile:bundlePath];

    BOOL exists = [[NSFileManager defaultManager] fileExistsAtPath:bundlePath isDirectory:nil];
    if (!exists) warn(@"%@.strings %@", country, exists ? @"FOUND" : @"NOT FOUND");

    trace(@"Preferred: %@ %@",[bundlePath lastPathComponent], self.preferredCountryBundle);
}


- (NSString*) countryStringForKey:(NSString*)key 
{
    NSString* result = nil;
    if (preferredCountryBundle!=nil) result = [preferredCountryBundle objectForKey:key];
    if (result == nil) result = [fallbackCountryBundle objectForKey:key];
    if (result == nil) result = key;

    return result;
}


@end

Then call it from a macro function

#define countryString(key) [[Localization sharedInstance]countryStringForKey:key];

Write a default file for ES, and one file per supported language. eg:

/* 
  country-ES.strings
*/

"hello" = "hello";

And just get the value for the key:

countryString(@"hello");