在Swift中，有一个更简单的方法来获得当前应用程序语言:

Locale(identifier: Bundle.main.preferredLocalizations[0]).languageCode!

它可以像这样切换，例如:

let supportUrl: URL = {
    switch Locale(identifier: Bundle.main.preferredLocalizations[0]).languageCode {
    case "de":
        return Constants.supportUrlGerman

    default:
        return Constants.supportUrlEnglish
    }
}

我希望这能有所帮助!

甚至还有更好的方法来获取当前设备语言。让我们试试下面的代码-

NSLog(@"Current Language - %@", [[NSLocale preferredLanguages] firstObject]);

这是阿比森的建议

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

如果你只想得到语言，这里是我建议的答案:

NSString *langplusreg = [[NSLocale preferredLanguages] objectAtIndex:0];
NSString * langonly = [[langplusreg componentsSeparatedByString:@"-"] 
objectAtIndex:0];

在我的情况下，我只是想Locale语言而不是Locale区域。

输出: 如果你的区域语言是日语，区域区域是日本，那么:

朗加雷格 = 是-JP

朗只 = 和

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

在Swift 4.2和Xcode 10.1中

let language = NSLocale.preferredLanguages[0]
debugPrint(language)//en

在Swift 5.x中

let langStr = Locale.current.languageCode
debugPrint(langStr ?? "") //en  el