带索引的Enum

enum eEventTabType : String {
    case Search     = "SEARCH"
    case Inbox      = "INBOX"
    case Accepted   = "ACCEPTED"
    case Saved      = "SAVED"
    case Declined   = "DECLINED"
    case Organized  = "ORGANIZED"

    static let allValues = [Search, Inbox, Accepted, Saved, Declined, Organized]
    var index : Int {
       return eEventTabType.allValues.indexOf(self)!
    }
}

计数:eEventTabType.allValues.count

index: objeceventtabtype .index

享受:)

为什么要把事情搞得这么复杂?Int enum最简单的计数器是添加:

病例数

最后。和…维奥拉，现在你有计数了，又快又简单

当然，它不是动态的，但在很多情况下，你可以在Enum中添加一个静态的var

静态变量计数:Int{返回7}

然后使用它作为EnumName.count

我有一篇博客文章详细介绍了这一点，但只要你的枚举的原始类型是一个整数，你可以这样添加一个计数:

enum Reindeer: Int {
    case Dasher, Dancer, Prancer, Vixen, Comet, Cupid, Donner, Blitzen
    case Rudolph

    static let count: Int = {
        var max: Int = 0
        while let _ = Reindeer(rawValue: max) { max += 1 }
        return max
    }()
}

带索引的Enum

enum eEventTabType : String {
    case Search     = "SEARCH"
    case Inbox      = "INBOX"
    case Accepted   = "ACCEPTED"
    case Saved      = "SAVED"
    case Declined   = "DECLINED"
    case Organized  = "ORGANIZED"

    static let allValues = [Search, Inbox, Accepted, Saved, Declined, Organized]
    var index : Int {
       return eEventTabType.allValues.indexOf(self)!
    }
}

计数:eEventTabType.allValues.count

index: objeceventtabtype .index

享受:)

在Swift 4.2 (Xcode 10)中，你可以声明 符合CaseIterable协议，这适用于所有 没有关联值的枚举:

enum Stuff: CaseIterable {
    case first
    case second
    case third
    case forth
}

病例数现在是简单地用

print(Stuff.allCases.count) // 4

有关更多信息，请参见

SE-0194枚举案例的派生集合