1335: feat：翻译完 1335 Type Casting⭐️⭐️⭐️⭐️ #1377
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yongfrank
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@Shinolr @brooklyn1999 有空请帮忙 Review Thx! |
Pancf
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Sep 27, 2024
| Specifically, it declares a `name` property of type `String`, | ||
| and an `init(name:)` initializer. | ||
| (It's assumed that all media items, including all movies and songs, will have a name.) | ||
| 第一个代码片段定义了一个名为 `MediaItem` 的新基类。 |
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“新基类”感觉有一点奇怪。“一个新的名为‘MediaItem’的基类‘或者干脆去掉”新“，我觉得更符合中文习惯。
| (It's assumed that all media items, including all movies and songs, will have a name.) | ||
| 第一个代码片段定义了一个名为 `MediaItem` 的新基类。 | ||
| 该类为数字媒体库中出现的任何类型项目提供基本功能。 | ||
| 具体来说，它声明了一个字符串类型的 `name` 属性和一个 `init(name:)` 初始化器。 |
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NIT，“初始化器”在已有的翻译中是比较通用的说法了吗？另外String这种类型关键字的翻译约定是保留还是不保留？
| The second subclass, `Song`, adds an `artist` property and initializer | ||
| on top of the base class: | ||
| 下一个代码段定义了 `MediaItem` 的两个子类。 | ||
| 第一个子类 `Movie` 封装了电影或影片的附加信息。 |
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这里movie or film感觉没必要特意翻译出“电影或影片”，就叫电影或影片即可。
| 其中包含两个 `Movie` 实例和三个 `Song` 实例。 | ||
| `library` 数组的类型是通过使用数组字面值初始化来推断的。 | ||
| Swift 的类型检查程序能够推断出 `Movie` 和 `Song` 有一个共同的父类 `MediaItem`， | ||
| 因此推断出 library 数组的类型为 `[MediaItem]`： |
| you need to *check* their type, | ||
| or *downcast* them to a different type, | ||
| as described below. | ||
| `library` 中存储的项目在幕后仍然是 `Movie` 和 `Song` 实例。 |
| Several of the `switch` statement's cases bind their matched value to | ||
| a constant of the specified type to enable its value to be printed: | ||
| `things` 数组包含两个 `Int` 值、两个 `Double` 值、一个 `String` 值、一个类型为 `(Double, Double)` 的元组、电影 “捉鬼敢死队”， | ||
| 以及一个接收字符串值并返回另一个字符串值的闭包表达式。 |
| and queries the type of each item with a `switch` statement. | ||
| Several of the `switch` statement's cases bind their matched value to | ||
| a constant of the specified type to enable its value to be printed: | ||
| `things` 数组包含两个 `Int` 值、两个 `Double` 值、一个 `String` 值、一个类型为 `(Double, Double)` 的元组、电影 “捉鬼敢死队”， |
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这里不要直译“电影捉鬼敢死队”，可以是“movie实例”，名称翻不翻无所谓
| 以及一个接收字符串值并返回另一个字符串值的闭包表达式。 | ||
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| 如果常量或变量的已知类型是 `Any` 或 `AnyObject`，要确定其具体类型，可以在 switch 语句的情况下使用 `is` 或 `as` 模式。 |
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| 如果常量或变量的已知类型是 `Any` 或 `AnyObject`，要确定其具体类型，可以在 switch 语句的情况下使用 `is` 或 `as` 模式。 | ||
| 下面的示例遍历了 `things` 数组中的项目，并使用 `switch` 语句查询了每个项目的类型。 | ||
| 该 `switch` 语句的一些情况将其匹配值与指定类型的常量绑定，以便打印其值： |
| > as shown below. | ||
| > 注意: `Any` 类型代表任何类型的值，包括可选类型。 | ||
| > 如果你使用的是可选值，而预期值是 `Any` 类型，Swift 会发出警告。 | ||
| > 如果您确实需要将可选值用作 `Any` 值，可以使用 `as` 操作符显式地将可选值转换为 `Any` 值，如下所示。 |
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原文地址：https://docs.swift.org/swift-book/documentation/the-swift-programming-language/typecasting/
Closes: #1335