blocks|key|180780|text|您可以尝试在下面的AppDelegate.swift，但变化不会立即出现，但在你杀死和重新启动你的应用程序。-|type|unstyled|depth|inlineStyleRanges|entityRanges|data|180781|NSUserDefaults.standardUserDefaults().removeObjectForKey("AppleLanguages")
NSUserDefaults.standardUserDefaults().setObject(["de"],+forKey:+"AppleLanguages"+++
NSUserDefaults.standardUserDefaults().synchronize()|code-block|syntax|javascript|180782|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|$]]

You may try below in AppDelegate.swift though changes will not appear instantly but after you kill and relaunch your app. -

<pre><code>NSUserDefaults.standardUserDefaults().removeObjectForKey("AppleLanguages")
NSUserDefaults.standardUserDefaults().setObject(["de"], forKey: "AppleLanguages" 
NSUserDefaults.standardUserDefaults().synchronize()
</code></pre>

blocks|key|2192748|text|是的，你可以立即改变应用语言，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2192749|var+language+=+"de"
let+path+=+NSBundle.mainBundle().pathForResource(language,+ofType:+"lproj")
let+bundle+=+NSBundle(path:+path!)
let+string+=+bundle?.localizedStringForKey("key",+value:+nil,+table:+nil)|code-block|syntax|javascript|2192750|将您的NSUserDefaults值用于语言。|2192751|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Yes you can change the app language immediately like,

<pre><code>var language = "de"
let path = NSBundle.mainBundle().pathForResource(language, ofType: "lproj")
let bundle = NSBundle(path: path!)
let string = bundle?.localizedStringForKey("key", value: nil, table: nil)
</code></pre>

use your NSUserDefaults value to language.

blocks|key|1149816|text|如果出于测试目的，只需更改模拟器设置应用程序中的语言即可。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1149817|如果你想在你的应用程序中做一种语言选择器，它是很漂亮的痛苦，在我看来你不应该这么做。|offset|length|1149818|您的应用程序从设备中读取语言和地区设置，并相应地更改UI。|1149819|覆盖这种行为是很困难的，而且您永远无法完成语言的完全更改，例如，如果您试图在应用程序中显示地图，而您的设备语言是西班牙语，但是应用程序语言是英语，您将看到用西班牙语编写的地图符号。|1149820|这里是一个可能有帮助的项目。|1149821|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/9939885/manual-language-selection-in-an-ios-app-iphone-and-ipad|1|http://createdineden.com/blog/2014/december/12/language-changer-in-app-language-selection-in-ios/^0|0|R|2|0|0|0|0|0|2|1|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|W|8|@]|9|@$D|X|E|Y|1|Z]]|A|$]]|$1|F|3|G|5|6|7|10|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|11|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|12|8|@]|9|@$D|13|E|14|1|15]]|A|$]]|$1|L|3|-4|5|6|7|16|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|S]]|T|$5|O|P|Q|A|$R|U]]]]

If mean for test purpose, just change the language in simulator settings app. 
If you are trying to make a sort of language selector in your app, it' pretty <a href="https://stackoverflow.com/questions/9939885/manual-language-selection-in-an-ios-app-iphone-and-ipad">painful</a> and in my opinion you should not. 
Your app reads language and locale settings from the device and change the UI accordingly. Override this behavior is tough and you will never accomplish a full change in language, for instance if you try to display a map in you app and your device language is Spanish, but the app language is english, you will see the map indications written in Spanish. 
<a href="http://createdineden.com/blog/2014/december/12/language-changer-in-app-language-selection-in-ios/" rel="nofollow noreferrer">Here</a> a project that could help.

blocks|key|2192876|text|下面是在swift发布之前如何改变语言的方法-|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2192877|让我说，我想强制Hebrew本地化：|2192878|1.创建您自己的Main.swift类|2192879|import+Foundation
import+UIKit

//+Your+initialization+code+here
let+langCultureCode:+String+=+"he_IL"
let+defaults+=+NSUserDefaults.standardUserDefaults()
defaults.setObject([langCultureCode],+forKey:+"AppleLanguages")
defaults.synchronize()

UIApplicationMain(Process.argc,+Process.unsafeArgv,+nil,+NSStringFromClass(AppDelegate))|code-block|syntax|javascript|2192880|2.解除AppDelegate.swift的“主要”责任|2192881|//@UIApplicationMain+<--+COMMENT+THIS+OUT
class+AppDelegate:+UIResponder,+UIApplicationDelegate+|2192882|这将使您的应用程序被迫在不需要任何启动的情况下进行区域设置。|2192883|entityMap^0|4|5|0|8|6|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Z|8|@$9|10|A|11|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|12|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|13|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|14|8|@]|D|@]|E|$]]|$1|Q|3|R|5|L|7|15|8|@]|D|@]|E|$M|N]]|$1|S|3|T|5|6|7|16|8|@]|D|@]|E|$]]|$1|U|3|-4|5|6|7|17|8|@]|D|@]|E|$]]]|V|$]]

Here is how you change the language prior to launch in <code>swift</code> - 

Lets say i want to force <code>Hebrew</code> localization:

<h1>1. Create your own Main.swift class</h1>

<pre><code>import Foundation
import UIKit

// Your initialization code here
let langCultureCode: String = "he_IL"
let defaults = NSUserDefaults.standardUserDefaults()
defaults.setObject([langCultureCode], forKey: "AppleLanguages")
defaults.synchronize()

UIApplicationMain(Process.argc, Process.unsafeArgv, nil, NSStringFromClass(AppDelegate))
</code></pre>

<h1>2. Remove your AppDelegate.swift "main" responsibility</h1>

<pre><code>//@UIApplicationMain &lt;-- COMMENT THIS OUT
class AppDelegate: UIResponder, UIApplicationDelegate 
</code></pre>

This will make your app forced to a locale WITHOUT needing any launch

blocks|key|1149902|text|您必须使用数组而不是字符串设置AppleLanguages键：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1149903|UserDefaults.standard.set(["de"],+forKey:+"AppleLanguages")|code-block|syntax|javascript|1149904|entityMap^0|F|E|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

You have to set the <code>AppleLanguages</code> key with an array, not a string:

<pre><code>UserDefaults.standard.set(["de"], forKey: "AppleLanguages")
</code></pre>

blocks|key|181578|text|更新@royherma答复中提到的main.swift文件的Swift语法。这将避免在重写UserDefaults设置之后重新启动应用程序：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|181579|import+Foundation
import+UIKit

//+Your+initialization+code+here
let+langCultureCode:+String+=+"LANGUAGE_CODE"

UserDefaults.standard.set([langCultureCode],+forKey:+"AppleLanguages")
UserDefaults.standard.synchronize()

UIApplicationMain(CommandLine.argc,+CommandLine.unsafeArgv,+nil,+NSStringFromClass(AppDelegate.self))|code-block|syntax|javascript|181580|同时删除@UIApplicationMain文件中的AppDelegate.swift。|181581|entityMap^0|H|A|0|0|4|I|Q|H|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|X|8|@]|D|@]|E|$]]]|N|$]]

Updated Swift syntax of the <code>main.swift</code> file mentioned in @royherma's answer. This will avoid having to restart the app after overriding the UserDefaults settings:

<pre><code>import Foundation
import UIKit

// Your initialization code here
let langCultureCode: String = "LANGUAGE_CODE"

UserDefaults.standard.set([langCultureCode], forKey: "AppleLanguages")
UserDefaults.standard.synchronize()

UIApplicationMain(CommandLine.argc, CommandLine.unsafeArgv, nil, NSStringFromClass(AppDelegate.self))
</code></pre>

paired together with the removal of <code>@UIApplicationMain</code> in your <code>AppDelegate.swift</code> file.

blocks|key|2192979|text|这个解决方案适用于我：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2192980|创建绑定的扩展|ordered-list-item|2192981|++++import+Foundation

++++class+L012Localizer:+NSObject+{
++++++++class+func+DoTheSwizzling()+{
++++++++++++MethodSwizzleGivenClassName(cls:+Bundle.self,+originalSelector:+#selector(Bundle.localizedString(forKey:value:table:)),+overrideSelector:
++++++++++++++++#selector(Bundle.specialLocalizedString(key:value:table:)))
++++++++}
++++}

++++extension+Bundle+{
++++++++@objc+func+specialLocalizedString(key:+String,+value:+String?,+table+tableName:+String?)+->+String+{
++++++++++++let+currentLanguage+=+Utils.currentLanguage().rawValue
++++++++++++var+bundle+=+Bundle();
++++++++++++if+currentLanguage+!=+""+,+let+_path+=+Bundle.main.path(forResource:+currentLanguage,+ofType:+"lproj")+{
++++++++++++++++bundle+=+Bundle(path:+_path)!
++++++++++++}+else+{
++++++++++++++++let+_path+=+Bundle.main.path(forResource:+"Base",+ofType:+"lproj")!
++++++++++++++++bundle+=+Bundle(path:+_path)!
++++++++++++}
++++++++++++return+(bundle.specialLocalizedString(key:+key,+value:+value,+table:+tableName))
++++++++}
++++}

++++func+MethodSwizzleGivenClassName(cls:+AnyClass,+originalSelector:+Selector,+overrideSelector:+Selector){

++++++++let+origMethod:+Method+=+class_getInstanceMethod(cls,+originalSelector)!;
++++++++let+overrideMethod:+Method+=+class_getInstanceMethod(cls,+overrideSelector)!;
++++++++if+(class_addMethod(cls,+originalSelector,+method_getImplementation(overrideMethod),+method_getTypeEncoding(overrideMethod)))+{
++++++++++++class_replaceMethod(cls,+overrideSelector,+method_getImplementation(origMethod),+method_getTypeEncoding(origMethod));
++++++++}+else+{
++++++++++++method_exchangeImplementations(origMethod,+overrideMethod);
++++++++}
++++}|code-block|syntax|javascript|2192982|调用DoTheSwizzling+in+AppDelegate|offset|length|style|BOLD|2192983|+++++func+application(_+application:+UIApplication,+didFinishLaunchingWithOptions+launchOptions:+[UIApplication.LaunchOptionsKey:+Any]?)+->+Bool+{
++++++++++++L012Localizer.DoTheSwizzling()
++++++++++++return+true
++++++++}|2192984|创建语言Utils|2192985|++++class+Utils:+NSObject+{
++++++++class+func+setLanguage(_+lang:+LanguageType)+{
++++++++++++UserDefaults.standard.set([lang.rawValue],+forKey:+"AppleLanguages")
++++++++}

++++++++class+func+currentLanguage()+->+LanguageType+{
++++++++++++if+let+langs+=+UserDefaults.standard.object(forKey:+"AppleLanguages")+as?+[String],+let+currentLang+=+langs.first+{
++++++++++++++++return+LanguageType(rawValue:+currentLang)+??+.english
++++++++++++}

++++++++++++return+.english
++++++++}
++++}|2192986|创建语言类型|2192987|++++enum+LanguageType:+String+{
++++++++case+english+=+"en"
++++++++case+korea+=+"ko"
++++++++case+vietnamese+=+"vi-VN"

++++++++func+toString()+->+String+{
++++++++++++switch+self+{
++++++++++++case+.korea:
++++++++++++++++return+"Korea".localized
++++++++++++case+.vietnamese:
++++++++++++++++return+"Vietnamese".localized
++++++++++++default:
++++++++++++++++return+"English".localized
++++++++++++}
++++++++}
++++}|2192988|请记住，您必须在SystemLanguage的Scheme中配置应用程序语言。|2192989|📷|atomic|2192990|然后每次你需要本地化你的应用程序，你只需要打电话。Utils.setLanguage({LanguageType})|2192991|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/a7ddfb3c1de83f92e0019dbab6128e3e.png|imageAlt^0|0|0|0|2|E|K|B|0|0|0|0|0|0|8|E|N|6|W|6|0|0|1|0|0|P|X|0^^$0|@$1|2|3|4|5|6|7|1F|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|1G|8|@]|9|@]|A|$]]|$1|E|3|F|5|G|7|1H|8|@]|9|@]|A|$H|I]]|$1|J|3|K|5|D|7|1I|8|@$L|1J|M|1K|N|O]|$L|1L|M|1M|N|O]]|9|@]|A|$]]|$1|P|3|Q|5|G|7|1N|8|@]|9|@]|A|$H|I]]|$1|R|3|S|5|D|7|1O|8|@]|9|@]|A|$]]|$1|T|3|U|5|G|7|1P|8|@]|9|@]|A|$H|I]]|$1|V|3|W|5|D|7|1Q|8|@]|9|@]|A|$]]|$1|X|3|Y|5|G|7|1R|8|@]|9|@]|A|$H|I]]|$1|Z|3|10|5|D|7|1S|8|@$L|1T|M|1U|N|O]|$L|1V|M|1W|N|O]|$L|1X|M|1Y|N|O]]|9|@]|A|$]]|$1|11|3|12|5|13|7|1Z|8|@]|9|@$L|20|M|21|1|22]]|A|$]]|$1|14|3|15|5|D|7|23|8|@$L|24|M|25|N|O]]|9|@]|A|$]]|$1|16|3|-4|5|6|7|26|8|@]|9|@]|A|$]]]|17|$18|$5|19|1A|1B|A|$1C|1D|1E|-4]]]]

This solution work for me: 
1. Create an extension of Bundle 

<pre><code>

 import Foundation

 class L012Localizer: NSObject {
 class func DoTheSwizzling() {
 MethodSwizzleGivenClassName(cls: Bundle.self, originalSelector: #selector(Bundle.localizedString(forKey:value:table:)), overrideSelector:
 #selector(Bundle.specialLocalizedString(key:value:table:)))
 }
 }

 extension Bundle {
 @objc func specialLocalizedString(key: String, value: String?, table tableName: String?) -> String {
 let currentLanguage = Utils.currentLanguage().rawValue
 var bundle = Bundle();
 if currentLanguage != "" , let _path = Bundle.main.path(forResource: currentLanguage, ofType: "lproj") {
 bundle = Bundle(path: _path)!
 } else {
 let _path = Bundle.main.path(forResource: "Base", ofType: "lproj")!
 bundle = Bundle(path: _path)!
 }
 return (bundle.specialLocalizedString(key: key, value: value, table: tableName))
 }
 }

 func MethodSwizzleGivenClassName(cls: AnyClass, originalSelector: Selector, overrideSelector: Selector){

 let origMethod: Method = class_getInstanceMethod(cls, originalSelector)!;
 let overrideMethod: Method = class_getInstanceMethod(cls, overrideSelector)!;
 if (class_addMethod(cls, originalSelector, method_getImplementation(overrideMethod), method_getTypeEncoding(overrideMethod))) {
 class_replaceMethod(cls, overrideSelector, method_getImplementation(origMethod), method_getTypeEncoding(origMethod));
 } else {
 method_exchangeImplementations(origMethod, overrideMethod);
 }
 }

</code></pre>

 
2. Call DoTheSwizzling in AppDelegate
 

<pre><code>


 func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
 L012Localizer.DoTheSwizzling()
 return true
 }

</code></pre>

 
3. Create Language Utils
 

<pre><code>

 class Utils: NSObject {
 class func setLanguage(_ lang: LanguageType) {
 UserDefaults.standard.set([lang.rawValue], forKey: "AppleLanguages")
 }

 class func currentLanguage() -> LanguageType {
 if let langs = UserDefaults.standard.object(forKey: "AppleLanguages") as? [String], let currentLang = langs.first {
 return LanguageType(rawValue: currentLang) ?? .english
 }

 return .english
 }
 }

</code></pre>

 
4. Create Language Type
 

<pre><code>

 enum LanguageType: String {
 case english = "en"
 case korea = "ko"
 case vietnamese = "vi-VN"

 func toString() -> String {
 switch self {
 case .korea:
 return "Korea".localized
 case .vietnamese:
 return "Vietnamese".localized
 default:
 return "English".localized
 }
 }
 }

</code></pre>

 
5. Remember that you have to config Application Language in Scheme to SystemLanguage
 
<a href="https://i.stack.imgur.com/jff93.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/jff93.png" alt="enter image description here"></a>
 
6. Then Every time you need to localize your app, you only need to call. Utils.setLanguage({LanguageType})

I am trying to implement a function that can change app language. 
I tried to set it like this:

<pre><code>let defaults = NSUserDefaults.standardUserDefaults()
defaults.setObject("de", forKey: "AppleLanguages")
</code></pre>

And after app restart language is still 'system default'. 
Now I test different languages by setting <code>Scheme &gt; Application Language &gt; language</code>. 
But is it possible to user click a button and after restart to see picked language? 

Also what is the proper way to do this to avoid changing language on restart?

Setting "AppleLanguages" doesn't change app language

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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我正在尝试实现一个可以改变应用语言的函数。我试着把它设置成这样let defaults = NSUserDefaults.standardUserDefaults()defaults.setObject("de", forKey: "AppleLanguages")在应用程序重新启动之后，语言仍然是“系统默认”。现在，...

问设置"AppleLanguages“不会改变应用程序语言
EN

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问设置"AppleLanguages“不会改变应用程序语言EN