blocks|key|643509|text|按照@MartinR的提示，我现在使用的是currencyFormatter.locale+=+Locale(identifier:+Locale.preferredLanguages.first!)，它完全对应于设备当前的语言和区域设置。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|643510|不过，我并不完全确定这段代码是防弹的(因为有first!，尤其是)，所以如果您有其他建议，请放心。|643511|entityMap^0|L|27|0|M|6|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|P|8|@]|D|@]|E|$]]]|I|$]]

Following @MartinR's hint, I'm now using <code>currencyFormatter.locale = Locale(identifier: Locale.preferredLanguages.first!)</code>, which corresponds exactly to the device's current language &amp; region settings.

I'm not entirely sure this code is bullet-proof though (because of <code>first!</code>, most notably) so if you have other suggestions, please feel free.

blocks|key|1282726|text|基于@Romain的回答，first!的强制展开可以通过使用Locale.current.identifier作为后盾来避免。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1282727|func+getPreferredLocale()+->+Locale+{
++++guard+let+preferredIdentifier+=+Locale.preferredLanguages.first+else+{
++++++++return+Locale.current
++++}
++++return+Locale(identifier:+preferredIdentifier)
}|code-block|syntax|javascript|1282728|entityMap^0|D|6|U|P|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

Based on @Romain's answer the forced unwrapping of <code>first!</code> could be avoided by using the <code>Locale.current.identifier</code> as fallback.

<pre><code>func getPreferredLocale() -&gt; Locale {
 guard let preferredIdentifier = Locale.preferredLanguages.first else {
 return Locale.current
 }
 return Locale(identifier: preferredIdentifier)
}
</code></pre>

blocks|key|643280|text|@florieger以分机的形式回答：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|643281|import+Foundation

extension+Locale+{
++++static+func+preferredLocale()+->+Locale+{
++++++++guard+let+preferredIdentifier+=+Locale.preferredLanguages.first+else+{
++++++++++++return+Locale.current
++++++++}
++++++++return+Locale(identifier:+preferredIdentifier)
++++}
}|code-block|syntax|javascript|643282|然后像这样使用它：|643283|dateFormatter.locale+=+Locale.preferredLocale()
datePicker.locale+=+Locale.preferredLocale()|643284|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

@florieger's answer in the form of extension: 

<pre><code>import Foundation

extension Locale {
 static func preferredLocale() -&gt; Locale {
 guard let preferredIdentifier = Locale.preferredLanguages.first else {
 return Locale.current
 }
 return Locale(identifier: preferredIdentifier)
 }
}
</code></pre>

Then use it like this: 

<pre><code>dateFormatter.locale = Locale.preferredLocale()
datePicker.locale = Locale.preferredLocale()
</code></pre>

blocks|key|11091|text|@Romain这里的问题是，您没有本地化您的应用程序的法语，但只为英语。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|11092|转到带有应用程序名称的左上角蓝色文件，选择Project+>+Info，在本地化区域，您将看到"English+-+Development+Language“。按%2B并选择法语(fr)。|11093|就这样。现在您可以使用Locale.current，如果设备(或模拟器)的第一语言是法语，则应用程序将显示法语货币格式。|11094|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

@Romain
The problem here is that you have not localized your app for French but only for English.

Go to the upper left blue file with the name of your app, select Project > Info and in the Localization area you will see "English - Development Language".
Press + and choose French (fr).

That's it.
Now you can use Locale.current and if the first language of a device (or simulator) is French, your app will show French currency format.

blocks|key|1282857|text|如果其他一切都失败了|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1282858|我花了一个小时调试这个。我在德国，我的iPhone语言设置是英语，我的区域是德国。|1282859|我正在调试一个应用程序，它从iPhone中获取区域设置，并将其作为头传递给服务器。我想知道为什么我总是用德语获取所有的数据字符串。看看这个应用程序，一切都做对了：|1282860|++++if+let+deviceLanguageCode+=+Locale.current.languageCode,
++++deviceRegionCode+=+Locale.current.regionCode+{
++++++++//+do+stuff+here
++++}|code-block|syntax|javascript|1282861|deviceLanguageCode上面的变量总是返回de。|offset|length|style|CODE|1282862|但应该是“恩”！|1282863|我什么都试过了。我用了Locale.autoupdatingCurrent.languageCode或Locale.preferredLanguages.first等，什么都没用。我检查了我的项目设置，我的Localizable.strings文件。一切都很好。如果我创建了一个新的Xcode项目并打印这些变量，我将得到正确的地区和区域：en_DE。|1282864|这太让人恼火了！|1282865|只有当我用尽所有的可能性时，我才读了保罗·哈德森(+Paul+)的帖子+(还有谁？)最后，他给出了一个测试本地化的提示：|1282866|提示:您可以通过转到“产品”菜单，按住Alt键，然后选择“Run.”来在语言之间切换。在Options选项卡下面查看，您将看到Application默认设置为System，但您可以为测试目的更改为其他语言。|blockquote|1282867|还有..。“霍勒尔！”有人在我之前到过那里，并把应用程序语言和地区设置到德国！怪不得我有一段艰难的时光！|1282868|故事的结尾:确保这些设置为系统，否则什么都不能工作;)|1282869|​|1282870|📷|atomic|1282871|1282872|entityMap|0|LINK|mutability|MUTABLE|url|https://www.hackingwithswift.com/example-code/uikit/how-to-localize-your-ios-app|1|IMAGE|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/e3a6f53d187f2ecb7f136c624502888e.png|imageAlt^0|0|0|0|0|0|I|R|2|0|0|B|13|1F|V|2V|J|4P|5|0|0|X|2|0|0|0|0|0|0|0|1|1|0|0^^$0|@$1|2|3|4|5|6|7|1P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1Q|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|1R|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|1S|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|1T|8|@$M|1U|N|1V|O|P]|$M|1W|N|1X|O|P]]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1Y|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|1Z|8|@$M|20|N|21|O|P]|$M|22|N|23|O|P]|$M|24|N|25|O|P]|$M|26|N|27|O|P]]|9|@]|A|$]]|$1|U|3|V|5|6|7|28|8|@]|9|@]|A|$]]|$1|W|3|X|5|6|7|29|8|@]|9|@$M|2A|N|2B|1|2C]]|A|$]]|$1|Y|3|Z|5|10|7|2D|8|@]|9|@]|A|$]]|$1|11|3|12|5|6|7|2E|8|@]|9|@]|A|$]]|$1|13|3|14|5|6|7|2F|8|@]|9|@]|A|$]]|$1|15|3|16|5|6|7|2G|8|@]|9|@]|A|$]]|$1|17|3|18|5|19|7|2H|8|@]|9|@$M|2I|N|2J|1|2K]]|A|$]]|$1|1A|3|16|5|6|7|2L|8|@]|9|@]|A|$]]|$1|1B|3|-4|5|6|7|2M|8|@]|9|@]|A|$]]]|1C|$1D|$5|1E|1F|1G|A|$1H|1I]]|1J|$5|1K|1F|1L|A|$1M|1N|1O|-4]]]]

<h2>If everything else fails</h2>
I spent an hour debugging this. I am in Germany and my iPhone language settings are English and my Region is Germany.
I am debugging an app that takes the locale from the iPhone and pass it in an API call as a header to a server. I was wondering why I always get all the data strings in German. Looking into the app it was all done correctly:
<pre><code> if let deviceLanguageCode = Locale.current.languageCode,
 deviceRegionCode = Locale.current.regionCode {
 // do stuff here
 }
</code></pre>
The variable above <code>deviceLanguageCode</code> always returns <code>de</code>. 
But it should be &quot;en&quot;! 
I tried everything. I used <code>Locale.autoupdatingCurrent.languageCode</code> or <code>Locale.preferredLanguages.first</code> etc, nothing would work. I checked my project settings, my <code>Localizable.strings</code> files. All good. If I made a new Xcode project and print those variables I would get the correct locale, and region: <code>en_DE</code>.
This is so infuriating! 
Only when I exhausted all possibilities, I read this <a href="https://www.hackingwithswift.com/example-code/uikit/how-to-localize-your-ios-app" rel="noreferrer">post</a> by Paul Hudson, (who else?) and at the end, he gives a tip for testing the localisations:
<blockquote>
Tip: You can switch between languages by going to the Product menu, holding down the Alt key, then choosing “Run...” Look under the Options tab and you’ll see Application Language is set to System Language by default, but you can change to others there for testing purposes.
</blockquote>
And... 'quelle horreur!'
Somebody had been there before me and had set the App Language and Region to Germany!!! No wonder I had a hard time!
End of story: Make sure these are set to system or nothing will work ;)
<a href="https://i.stack.imgur.com/WBQk8.png" rel="noreferrer"><img src="https://i.stack.imgur.com/WBQk8.png" alt="enter image description here" /></a>

blocks|key|643344|text|当小部件应该具有与应用程序相同的语言和iPhone语言不同时，您可以使用以下方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|643345|func+getPreferredLocale()+->+Locale+{
++++guard+let+preferredIdentifier+=+Bundle.main.preferredLocalizations.first+else+{
++++++++return+Locale.current
++++}
++++return+Locale(identifier:+preferredIdentifier)
}|code-block|syntax|javascript|643346|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

When the widget should have the same language as the app and the iPhone language is different you can use this:
<pre><code>func getPreferredLocale() -&gt; Locale {
 guard let preferredIdentifier = Bundle.main.preferredLocalizations.first else {
 return Locale.current
 }
 return Locale(identifier: preferredIdentifier)
}
</code></pre>

blocks|key|643378|text|使用此代码从iOS+device获取当前系统语言代码|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|643379|let+pre+=+Locale.preferredLanguages[0]|code-block|syntax|javascript|643380|不过，如果你遇到了错误的语言代码，你就会面临这个问题。请将此对象从UserDefaults+"AppleLanguages“中删除，并使用相同的代码Locale.preferredLanguages。|643381|供你参考|643382|func+getSystemLanguageCode()+->+String+{
++++UserDefaults.standard.removeObject(forKey:+"AppleLanguages")
++++let+pref_Language+=+NSLocale.preferredLanguages[0]+as+String+//"fr-IN"
++++let+language+=+pref_Language.components(separatedBy:+"-")+//["fr","IN"]
++++let+lang_Code+=+language.first?.lowercased()+??+""+//"fr"
++++UserDefaults.standard.set([lang_Code],+forKey:+"AppleLanguages")
++++
++++return+lang_Code
}|643383|entityMap^0|6|A|0|0|X|C|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|M|3|N|5|6|7|Z|8|@]|D|@]|E|$]]|$1|O|3|P|5|H|7|10|8|@]|D|@]|E|$I|J]]|$1|Q|3|-4|5|6|7|11|8|@]|D|@]|E|$]]]|R|$]]

use this code for get current System language code from iOS device
<pre><code>let pre = Locale.preferredLanguages[0]
</code></pre>
Still if you face this issue
if you got wrong language code. kindly remove this object from UserDefaults &quot;AppleLanguages&quot; and use this same code Locale.preferredLanguages[0]
for your reference
<pre><code>func getSystemLanguageCode() -&gt; String {
 UserDefaults.standard.removeObject(forKey: &quot;AppleLanguages&quot;)
 let pref_Language = NSLocale.preferredLanguages[0] as String //&quot;fr-IN&quot;
 let language = pref_Language.components(separatedBy: &quot;-&quot;) //[&quot;fr&quot;,&quot;IN&quot;]
 let lang_Code = language.first?.lowercased() ?? &quot;&quot; //&quot;fr&quot;
 UserDefaults.standard.set([lang_Code], forKey: &quot;AppleLanguages&quot;)
 
 return lang_Code
}
</code></pre>

blocks|key|643658|text|摘要|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|643659|苹果希望，当开发人员决定支持本地化时，该项目将拥有可本地化的资源，比如字符串或故事板，以提供一致的UI+(例如，不只是打印本地格式的货币)，在这种情况下，使用Locale.current是合适的选择，对于支持的本地化(如这个答案所提到的)，它的工作效果非常好。|CODE|643660|然而，在“Romain‘s”这样的案例中：|643661|“我希望能够在用户的区域设置中打印货币号码，而不必为每一种语言提供本地化”|blockquote|643662|实现这一目标的解决方法是在发生Locale.preferredLanguages.first时使用null附带后备(如这个答案所述)。|643663|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/56177487|1|https://stackoverflow.com/a/48138683^0|0|2|0|1A|5|27|E|32|4|0|0|0|0|F|V|1D|4|1N|4|1|0^^$0|@$1|2|3|4|5|6|7|Z|8|@$9|10|A|11|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|12|8|@$9|13|A|14|B|C]|$9|15|A|16|B|H]]|D|@$9|17|A|18|1|19]]|E|$]]|$1|I|3|J|5|6|7|1A|8|@]|D|@]|E|$]]|$1|K|3|L|5|M|7|1B|8|@]|D|@]|E|$]]|$1|N|3|O|5|6|7|1C|8|@$9|1D|A|1E|B|H]|$9|1F|A|1G|B|H]]|D|@$9|1H|A|1I|1|1J]]|E|$]]|$1|P|3|-4|5|6|7|1K|8|@]|D|@]|E|$]]]|Q|$R|$5|S|T|U|E|$V|W]]|X|$5|S|T|U|E|$V|Y]]]]

Summary
Apple expects that when a developer decides to support localizations, the project would have localizable resources like strings or storyboards to provide consistent UI (e.g. not just to print currency in local format) and in this case using <code>Locale.current</code> is the appropriate choice and it would work just fine for supported localizations
(as mentioned by <a href="https://stackoverflow.com/a/56177487">this answer</a>).
However, in cases like @Romain's:
<blockquote>
&quot;I would have hoped I would be able to print currency numbers in the
user's regional settings without having to provide a localization for
every language&quot;
</blockquote>
the workaround to achieve that is by using <code>Locale.preferredLanguages.first</code> with fallback in case of <code>null</code> (as mentioned by <a href="https://stackoverflow.com/a/48138683">this answer</a>)

blocks|key|1282974|text|如果希望当前语言取决于用户区域和区域设置，请使用以下命令：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1282975|Locale.current.languageCode|code-block|syntax|javascript|1282976|但是，如果要设置当前语言，请使用以下代码：|1282977|Locale.preferredLanguages.first|1282978|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

if you want the current Language depends on the user region and Locale use this:
<pre><code>Locale.current.languageCode
</code></pre>
BUT IF you want SETTINGS CURRENT Language, use this code:
<pre><code>Locale.preferredLanguages.first
</code></pre>

I'm trying to format currency values in an iOS app, and I'm using the current Locale settings on the device to use the appropriate currency formatting.

In the simulator, everything seems to run fine: when using <code>currencyFormatter.locale = Locale.current</code>, it takes the right locale settings and prints numbers with the right currency format.

On my iPhone however, which is configured in French with French regional settings, I would expect another format to be used (e.g.: 1 234,56 €). But it does not work, and seems to use an English formatting style (e.g.: €1 234,56).

In fact, if I print the current Locale from my app on the device, it does not return <code>fr_FR</code> as I would expect:

<pre><code>NSLog(Locale.current.identifier)
&gt;&gt;&gt; en_FR
</code></pre>

The region is good but the language is not, though iOS on that device is clearly in French.

Has anyone an idea about this?

Thanks!

Locale.current reporting wrong language on device

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我试图在iOS应用程序中格式化货币值，并使用设备上当前的地区设置来使用适当的货币格式。在模拟器中，一切似乎都运行得很好:当使用currencyFormatter.locale = Locale.current时，它采用正确的区域设置，并以正确的货币格式打印数字。然而，在我的iPhone上，它是用法语配置的，具有法国的区...

问Locale.current在设备上报告错误语言
EN

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问Locale.current在设备上报告错误语言EN