如何实现 Enum 对案例有论据

Question

我有一个具有字符串原始值的枚举。我希望其中一种情况将字符串作为输入并返回该输入的字符串。我怎样才能做到这一点？

public enum PredictTypes: String {
    case favtasks = "isFav == YES"
    case importtanttasks = "isImportant == YES"
    case alltasks = ""
    case customList(listName: String) = "listName == \(listName)"
}

当我搜索时，我发现了一些帖子，但无法理解我的情况：

Can associated values and raw values coexist in Swift enumeration?

Answer 1

我会像这样重写你的枚举：

public enum PredictTypes {
    case favtasks
    case importanttasks
    case alltasks
    case customList(listName: String)

    var rawValue: String {
        switch self {
        case .favtasks: return "isFav == YES"
        case .importanttasks: return "isImportant == YES"
        case .alltasks: return ""
        case .customList(let listName): return "listName == \(listName)"
        }
    }
}