# 关于本地化

## localization包含的文件

localization的文件包括本地化string以及本地化图片.

工程中设置了本地化后,在info中可以看到,每种language的resources file个数并不相同(在资源文件相同的情况下也不相同).那么为什么英文的会多呢?多的是什么?

![](/files/-LAdZWROmB_Z_mb0s15C)

* 新建一个工程,查看localization的内容会发现英文有两个文件,这是因为使用英文作为development language.在创建工程时,会默认生成两个development language的文件算作本地化文件.这两个文件是Main.storyboard和 LaunchScreen.storyboard
* Base.lproj中的内容会算作development language的文件.

这就是为什么作为development language英文的会比其他语言的文件多了的原因.

## 当前系统语言  和 当前app显示语言

有本地化以后,在工程中经常要进行语言判断,常用的是判断当前系统语言,但是也会用到判断当前app显示语言的场景.

```
 [[NSLocale preferredLanguages] objectAtIndex:0];
```

这个方法可以获取当前系统设置语言,但是并不是本地化后app显示的语言(就是UI显示的语言),来寻找一下实现这个的方法,在NSLocale.h文件中,可以查看注释

```
@property (class, readonly, copy) NSArray<NSString *> *preferredLanguages NS_AVAILABLE(10_5, 2_0);
 // note that this list does not indicate what language the app is actually running in; 
 //the NSBundle.mainBundle object determines that at launch and knows that information
```

这个数组是根据设置中的首选语言顺序给出的数组.

![](/files/-LAdZWSb5X1pOPXlm2FK)

可以注意到,注释中解释app真正running in 的语言需要在 NSBundle.mainBundle中寻找.查看NSBundle.h可以找到以下代码

```
/* Methods for dealing with localizations. */
@property (readonly, copy) NSArray<NSString *> *preferredLocalizations;  
  // 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
```

实际上,app是根据上面那个首选语言顺序,依次查看当前是否有该语言的本地化,直到找到对应有本地化的语言或顺序查找完毕,如果所有首选语言都没有没本地化,将使用程序设置的默认语言,所以我们可以使用这个方法来获取

```
 [[[NSBundle mainBundle] preferredLocalizations] firstObject]
```


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