如何运用 Swift 的属性包装器实现应用本地化 (#6994)

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* 作为 2020 年的开发者，你应该学习 VIM 吗？ (#6856)

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TODO1/localize-swift-application.md

@@ -2,22 +2,22 @@
 > * 原文作者：[Dmytro Pylypenko](https://medium.com/@dimpiax)
 > * 译文出自：[掘金翻译计划](https://github.com/xitu/gold-miner)
 > * 本文永久链接：[https://github.com/xitu/gold-miner/blob/master/TODO1/localize-swift-application.md](https://github.com/xitu/gold-miner/blob/master/TODO1/localize-swift-application.md)
-> * 译者：
-> * 校对者：
+> * 译者：[chaingangway](https://github.com/chaingangway)
+> * 校对者：[Bruce-pac](https://github.com/Bruce-pac)
 
-# Localize Swift Application
+# 如何运用 Swift 的属性包装器实现应用本地化
 
 ![](https://cdn-images-1.medium.com/max/4800/1*SjXk6V6r3e94guJcg5mRzw.png)
 
-Hello Swift developers, I want to share with you my experience and knowledge about using **Property Wrappers** in an application and how to reduce your code and make it easier to maintain. I will write about this in several topic parts.
+您好，Swift 开发者，在本文中，我想与您分享我的经验和知识，主要内容有**属性包装器**（**Property Wrapper**）的使用，以及如何简化代码并使其易于维护。我会通过几个主题对此进行说明。
 
-In Swift 5.1, Apple introduced **Property Wrappers**, which gives the possibility to set up additional layer between your property and serving logic.
+在 Swift 5.1 中，Apple 引入了**属性包装器**，它可以让我们在属性和访问逻辑（getter 和 setter）之间设置中间层。
 
-This part is about how to localize your application using **Property Wrappers** and simple way within `@IBOutlet`.
+下面的内容是在 `@IBOutlet` 变量内部使用**属性包装器**的简便方法来实现应用本地化。
 
 ---
 
-So, instead of the **basic** case:
+优化下面这个**基础**版本：
 
 ```Swift
 class NatureViewController: UIViewController {
@@ -35,7 +35,7 @@ class NatureViewController: UIViewController {
 }
 ```
 
-We can improve the code with **property wrapper** `@Localized`, and have:
+我们可以用**属性包装器** `@Localized` 改进代码，如下：
 
 ```Swift
 class NatureViewController: UIViewController {
@@ -47,8 +47,8 @@ class NatureViewController: UIViewController {
 }
 ```
 
-It looks pretty, doesn’t it? So let’s create `@Localized` property wrapper.
-It will be good to apply key as enum, to have: `@Localized(.natureTitle)`
+这代码看起来很优雅，不是吗？下面让我们创建 `@Localized` 属性包装器。
+将 key 当做枚举来使用会更好，如：`@Localized(.natureTitle)`。
 
 ```Swift
 @propertyWrapper
@@ -67,8 +67,8 @@ struct Localized<T: Localizable> {
 }
 ```
 
-And be able to apply for any that conforms `Localizable` protocol.
-To achieve our goal, we will extend also `UILabel` and `UIButton`.
+为了能让更多的类型能够支持 `Localizable` 协议，
+我们要实现 `UILabel` 和 `UIButton` 的扩展方法。
 
 ```Swift
 protocol Localizable {
@@ -88,7 +88,7 @@ extension UILabel: Localizable {
 }
 ```
 
-And the final thing that we need is `LocalizationKey`:
+最后我们只需要实现 `LocalizationKey`:
 
 ```Swift
 enum LocalizationKey: String {
@@ -104,9 +104,9 @@ extension LocalizationKey {
 }
 ```
 
-As our enum is raw representable, as a `String` conforms to the protocol, it’s enough just to have `Localizable.strings` with the same keys for values.
+我们可以直接用 raw 的值来表示相应的 key，`String` 类型默认遵守这个协议，所以只需要枚举中的值与 `Localizable.strings` 中的 key 保持一致就可以了。
 
-So in the end our code looks like:
+最终的代码如下：
 
 ```Swift
 class NatureViewController: UIViewController {
@@ -120,14 +120,13 @@ class NatureViewController: UIViewController {
 
 ---
 
-That’s all in this part! Here are some potential ideas that `@Localized` can contain:
+本章结束！关于 `@Localized` 还有一些潜在功能：
 
-* applying format values with strings for dynamic replacement.
-* be able to determine strings from a specific table and bundle.
+* 格式化字符串数据，并进行动态替换。
+* 能够确定来自指定的表单和资源包的字符串。
 
-**More about Property Wrapper read in the official documentation:**
-[**Properties - The Swift Programming Language (Swift 5.2)**
-**Properties associate values with a particular class, structure, or enumeration. Stored properties store constant and…**docs.swift.org](https://docs.swift.org/swift-book/LanguageGuide/Properties.html)
+**想了解更多关于属性包装器的知识，请阅读官方文档：**
+[**Properties - The Swift Programming Language (Swift 5.2)**](https://docs.swift.org/swift-book/LanguageGuide/Properties.html)
 
 > 如果发现译文存在错误或其他需要改进的地方，欢迎到 [掘金翻译计划](https://github.com/xitu/gold-miner) 对译文进行修改并 PR，也可获得相应奖励积分。文章开头的 **本文永久链接** 即为本文在 GitHub 上的 MarkDown 链接。