Get SDL language from iOS app language

Language Update.m

// this method must be added into the class which implements SDLManagerDelegate
// at least you should return an empty object if you support the language. 
- (nullable SDLLifecycleConfigurationUpdate *)managerShouldUpdateLifecycleToLanguage:(SDLLanguage)language hmiLanguage:(SDLLanguage)hmiLanguage {
    SDLLifecycleConfigurationUpdate *update = [[SDLLifecycleConfigurationUpdate alloc] init];
    return update;
}

SDL.m

+ (SDLLanguage)sdlLanguageFromAppLanguage {
    NSArray<SDLLanguage> *sdlLanguageList = @[
        SDLLanguageArSa, SDLLanguageCsCz, SDLLanguageDaDk, SDLLanguageDeDe, SDLLanguageElGr, SDLLanguageEnUs /*en*/, SDLLanguageEnAu, SDLLanguageEnGb, SDLLanguageEnIn, SDLLanguageEnSa, SDLLanguageEsEs /*es*/, SDLLanguageEsMx, SDLLanguageFiFi, SDLLanguageFrFr /*fr*/, SDLLanguageFrCa, SDLLanguageHeIl, SDLLanguageHiIn, SDLLanguageHuHu, SDLLanguageIdId, SDLLanguageItIt, SDLLanguageJaJp, SDLLanguageKoKr, SDLLanguageMsMy, SDLLanguageNlNl /*nl*/, SDLLanguageNlBe, SDLLanguageNoNo, SDLLanguagePlPl, SDLLanguagePtPt /*pt*/, SDLLanguagePtBr, SDLLanguageRoRo, SDLLanguageRuRu, SDLLanguageSkSk, SDLLanguageSvSe, SDLLanguageThTh, SDLLanguageTrTr, SDLLanguageUkUa, SDLLanguageViVn, SDLLanguageZhCn, SDLLanguageZhTw
    ];
    NSArray<NSString *> *localizations = NSBundle.mainBundle.preferredLocalizations;
    NSString *localization = localizations.count > 0 ? localizations[0] : @"en";
    NSDictionary<NSString *, NSString *> *components = [NSLocale componentsFromLocaleIdentifier:localization];
    NSString *language = components[NSLocaleLanguageCode].uppercaseString;
    NSString *country = components[NSLocaleCountryCode].uppercaseString;
    NSString *script = components[NSLocaleScriptCode];
    
    if (language == nil || language.length == 0) return SDLLanguageEnUs;
    if (country == nil || country.length == 0) country = nil;
    if (script == nil || script.length == 0) script = nil;
    
    if (country) {
        SDLLanguage test = [NSString stringWithFormat:@"%@-%@", language, country];
        if ([sdlLanguageList containsObject:test]) {
            return test;
        } else {
            country = nil; // country is not recognized by SDL so the best matching locale should be selected.
        }
    }
    
    // SDL has only two chinese language locales for Taiwan and other chinese regions. If country could not be matched it's possible to match with script.
    if ([language isEqual:@"ZH"]) {
        if ([script isEqual:@"Hant"]) {
            return SDLLanguageZhTw; // traditional script is used in Taiwan
        } else {
            return SDLLanguageZhCn; // any other chinese speaking region
        }
    }
    
    // check for language code, fallback to EnUs
    __block SDLLanguage match = SDLLanguageEnUs;
    [sdlLanguageList indexOfObjectPassingTest:^BOOL(SDLLanguage  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
        if ([obj hasPrefix:language]) {
            match = obj;
            *stop = YES;
            return YES;
        }
    }];
    
    return match;
}

Setup Snippet.m

SDLLifecycleConfiguration *config = [SDLLifecycleConfiguration defaultConfigurationWithAppName:AppName fullAppId:AppId];
config.language = [self sdlLanguageFromAppLanguage];
config.languagesSupported = @[
        SDLLanguageArSa, SDLLanguageCsCz, SDLLanguageDaDk, SDLLanguageDeDe, SDLLanguageElGr, SDLLanguageEnUs /*en*/, SDLLanguageEnAu, SDLLanguageEnGb, SDLLanguageEnIn, SDLLanguageEnSa, SDLLanguageEsEs /*es*/, SDLLanguageEsMx, SDLLanguageFiFi, SDLLanguageFrFr /*fr*/, SDLLanguageFrCa, SDLLanguageHeIl, SDLLanguageHiIn, SDLLanguageHuHu, SDLLanguageIdId, SDLLanguageItIt, SDLLanguageJaJp, SDLLanguageKoKr, SDLLanguageMsMy, SDLLanguageNlNl /*nl*/, SDLLanguageNlBe, SDLLanguageNoNo, SDLLanguagePlPl, SDLLanguagePtPt /*pt*/, SDLLanguagePtBr, SDLLanguageRoRo, SDLLanguageRuRu, SDLLanguageSkSk, SDLLanguageSvSe, SDLLanguageThTh, SDLLanguageTrTr, SDLLanguageUkUa, SDLLanguageViVn, SDLLanguageZhCn, SDLLanguageZhTw
    ];