NSlocalization将默认语言从英语更改为其他语言

Question

我需要将我的默认（后备）语言设置为从英语到非英语。 例如我支持3种语言，例如en，fr，gr。现在如果用户选择中文，那么用户应该用fr语言显示。请帮我 。 我试过这段代码

self.strLanguage = [[NSLocale preferredLanguages] objectAtIndex:0];
NSLog(@"strLanguage : %@",self.strLanguage);

NSMutableArray *arraySupportedLanguages = [[NSMutableArray alloc] initWithObjects:@"en",@"fr",@"gr", nil];



NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF contains[cd] %@", self.strLanguage];
    arraySupportedLanguages = [[arraySupportedLanguages filteredArrayUsingPredicate:predicate]mutableCopy];

NSLog(@"arraySupportedLanguages : %@",arraySupportedLanguages);

if (arraySupportedLanguages.count == 0) {
                [[NSUserDefaults standardUserDefaults] setObject:@"nl" forKey:@"AppleLanguages"];
        [[NSUserDefaults standardUserDefaults]synchronize];
    }