swift - 如何允许结构变量使用多个枚举？

Question

这可能是一个奇怪的问题，但这里是。我是枚举的菜鸟，刚开始在我的代码中使用它们。我有一个结构 Points，它有几个变量，其中一个是枚举 PointCategory。问题是，有时我希望 var itemCategory 也允许不同的枚举:BudgetCategory。

我知道我不能这样做:

struct Points {
    var itemCategory: PointCategory || BudgetCategory
}

因为它会产生错误。但这基本上就是我想做的。我想这就像继承一个枚举？或类似的东西。有没有办法允许我的一个结构变量使用多个枚举？

这是当前代码:

enum BudgetCategory: String {
    case clothing = "Clothing"
    case donations = "Donations"
    case electronics = "Electronics"
    case funMoney = "Fun Money"
    case musicArt = "Music & Art"
    case other = "Other"
    case personalCare = "Personal Care"
    case savings = "Savings"
    case school = "School"
    case sportsDance = "Sports & Dance"
    case summerCamps = "Summer Camps"
    case transportation = "Transportation"
}

enum PointCategory: String {
    case outsideIncome = "outside income"
    case fees = "fees"
    case otherJobs = "other jobs"
    case payday = "payday"
    case dailyJobs = "daily jobs"
    case dailyHabits = "daily habits"
    case weeklyJobs = "weekly jobs"
    case otherTransactions = "other transactions"
    case all = "all"
    case unpaid = "unpaid"
}

struct Points {
    var user: String
    var itemName: String
    var itemCategory: PointCategory
    var code: PointCode
    var valuePerTap: Int
    var itemDate: Double
    var paid: Bool
}

还是我的做法完全错了？我乐于接受解释和建议。

Answer 1

上下文不清楚，但你可以使用泛型

protocol CustomCategory {}

enum BudgetCategory: String, CustomCategory {
    ...
}

enum PointCategory: String, CustomCategory {
    ...
}

struct Points<T : CustomCategory> {
    var user: String
    var itemName: String
    var itemCategory: T
    var code: PointCode
    var valuePerTap: Int
    var itemDate: Double
    var paid: Bool
}