如何从Swift的原始值获取枚举？ [英] How to get enum from raw value in Swift?

问题描述

我正在尝试从原始值获取枚举类型：

I'm trying to get enum type from raw value:

enum TestEnum: String {
    case Name
    case Gender
    case Birth

    var rawValue: String {
        switch self {
        case .Name: return "Name"
        case .Gender: return "Gender"
        case .Birth: return "Birth Day"
        }
    }
}

let name = TestEnum(rawValue: "Name")       //Name
let gender = TestEnum(rawValue: "Gender")   //Gender

但是，似乎 rawValue 对于具有空格的字符串不起作用：

But it seems that rawValue doesn't work for string with spaces:

let birth = TestEnum(rawValue: "Birth Day") //nil

任何建议如何获得它？

推荐答案

太复杂了，只需将原始值直接分配给案例

Too complicated, just assign the raw values directly to the cases

enum TestEnum: String {
  case Name = "Name"
  case Gender = "Gender"
  case Birth = "Birth Day"
}

let name = TestEnum(rawValue: "Name")!       //Name
let gender = TestEnum(rawValue: "Gender")!   //Gender
let birth = TestEnum(rawValue: "Birth Day")! //Birth

如果案例名称与原始值匹配，您甚至可以省略它

If the case name matches the raw value you can even omit it

enum TestEnum: String {
  case Name, Gender, Birth = "Birth Day"
}

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