Swift x27型表达模式；滚动'；无法匹配类型为'；请求。RawValue'；（又名翻滚）

我试图创建一个返回结构的枚举，但没有成功。我已经检查了一些与我的问题类似的问题，例如，这和他们没有解决我的问题。这是我的代码：

import Foundation

struct Roll {
    let times: String

    init(with times: String) {
        self.times = times
    }

}

fileprivate enum Requests {
    case poker
    case cards
    case slots
}

extension Requests: RawRepresentable {

    typealias RawValue = Roll

    init?(rawValue: RawValue) {
        switch rawValue {
        case Roll(with: "once"): self = .poker
        case Roll(with: "twice"): self = .cards
        case Roll(with: "a couple of times"): self = .slots
        default: return nil
        }
    }

    var rawValue: RawValue {
        switch self {
        case .poker: return Roll(with: "once")
        case .cards: return Roll(with: "twice")
        case .slots: return Roll(with: "a couple of times")
        }
    }
}

---

然后我想像这样使用它：

Requests.cards.rawValue

这是因为您的结构

Roll

不符合

equalable

协议，您试图对其进行比较，只需将其更改为

struct Roll: Equatable {
    let times: String

    init(with times: String) {
        self.times = times
    }    
}