Swift：将枚举值转换为String？ [英] Swift: Convert enum value to String?

问题描述

鉴于以下枚举：

enum Audience {
    case Public
    case Friends
    case Private
}

如何获取字符串公开从受众群体常数以下？

How do I get the string "Public" from the audience constant below?

let audience = Audience.Public

推荐答案

添加了这个功能的Swift版本，但现在（ Swift 2.1 ）只需要以下代码：

Not sure in which Swift version this feature was added, but right now (Swift 2.1) you only need this code:

enum Audience: String {
    case Public
    case Friends
    case Private
}

let audience = Audience.Public.rawValue // "Public"

当字符串用于原始值时，每个案例
是该案例名称的文本。

[...]

enum CompassPoint: String {
    case North, South, East, West
}

在上面的例子中，CompassPoint.South有一个隐含的原始
South的值，等等。

In the example above, CompassPoint.South has an implicit raw value of "South", and so on.

您可以使用其rawValue
属性访问枚举大小写的原始值：

You access the raw value of an enumeration case with its rawValue property:

let sunsetDirection = CompassPoint.West.rawValue
// sunsetDirection is "West"

源。

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