两封信的格式。苹果使用ISO标准ISO-3166。

NSString *localeCountryCode = [[NSLocale autoupdatingCurrentLocale] objectForKey:NSLocaleCountryCode];

对于获得用户设备当前语言使用以下它的代码，它为我工作。

NSString * myString = [[NSLocale preferredlanguage]objectAtIndex:0];

I actually misread the original question, thought it asked for the "app UI" language (that's what I had googled for), not the "device UI", in which case the best answers would be the ones using preferredLocalizations, but those answers still give you a code, there is one more step to get a nice string to display. So, while the "device UI" language is already answered, if you want to display a nice string for which of the UI languages you support is currently in use, obviously the simplest solution is:

NSLocalizedString(@"currentLanguage", @"")

在你的每一个UI本地化中你都指定了你想要的显示方式。例如，在你的。strings文件的en版本中，你会有:

"currentLanguage"="English";

在你的fr版本的.strings文件中，你会有:

"currentLanguage"="Francais";

等。不要混淆代码等，你可以让你自己的字符串很好地匹配你的UI。

iOS13, Swift 5+

Locale.preferredLanguages.first

iOS 9的解决方案:

NSString *language = [[NSLocale preferredLanguages] objectAtIndex:0];

language = "en-US"

NSDictionary *languageDic = [NSLocale componentsFromLocaleIdentifier:language];

languageDic将拥有所需的组件

NSString *countryCode = [languageDic objectForKey:@"kCFLocaleCountryCodeKey"];

countryCode = "US"

NSString *languageCode = [languageDic objectForKey:@"kCFLocaleLanguageCodeKey"];

密码:

我用这个

    NSArray *arr = [NSLocale preferredLanguages];
for (NSString *lan in arr) {
    NSLog(@"%@: %@ %@",lan, [NSLocale canonicalLanguageIdentifierFromString:lan], [[[NSLocale alloc] initWithLocaleIdentifier:lan] displayNameForKey:NSLocaleIdentifier value:lan]);
}

忽略内存泄漏..

结果是

2013-03-02 20:01:57.457 xx[12334:907] zh-Hans: zh-Hans 中文（简体中文）
2013-03-02 20:01:57.460 xx[12334:907] en: en English
2013-03-02 20:01:57.462 xx[12334:907] ja: ja 日本語
2013-03-02 20:01:57.465 xx[12334:907] fr: fr français
2013-03-02 20:01:57.468 xx[12334:907] de: de Deutsch
2013-03-02 20:01:57.472 xx[12334:907] nl: nl Nederlands
2013-03-02 20:01:57.477 xx[12334:907] it: it italiano
2013-03-02 20:01:57.481 xx[12334:907] es: es español

iOS13, Swift 5+， WWDC2019 https://developer.apple.com/videos/play/wwdc2019/403/

用户可以独立于操作系统语言选择应用程序的首选语言。

你可以使用这些:

    // Returns a list of the user's preferred languages.
    // Maybe more than (or none of) your app supports!
    Locale.preferredLanguages

    // a subset of this bundle's localizations, re-ordered into the preferred order
    // for this process's current execution environment; the main bundle's preferred localizations
    // indicate the language (of text) the user is most likely seeing in the UI
    Bundle.main.preferredLocalizations



    // The current running app language
    Bundle.main.preferredLocalizations.first

    // list of language names this bundle appears to be localized to
    Bundle.main.localizations