如何确定Swift enum中的案例数?
(我希望避免手动枚举所有值,或者如果可能的话使用旧的“enum_count技巧”。)
如何确定Swift enum中的案例数?
(我希望避免手动枚举所有值,或者如果可能的话使用旧的“enum_count技巧”。)
当前回答
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
其他回答
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:)
enum WeekDays : String , CaseIterable
{
case monday = "Mon"
case tuesday = "Tue"
case wednesday = "Wed"
case thursday = "Thu"
case friday = "Fri"
case saturday = "Sat"
case sunday = "Sun"
}
var weekdays = WeekDays.AllCases()
print("\(weekdays.count)")
enum EnumNameType: Int {
case first
case second
case third
static var count: Int { return EnumNameType.third.rawValue + 1 }
}
print(EnumNameType.count) //3
OR
enum EnumNameType: Int {
case first
case second
case third
case count
}
print(EnumNameType.count.rawValue) //3
*在Swift 4.2 (Xcode 10)可以使用:
enum EnumNameType: CaseIterable {
case first
case second
case third
}
print(EnumNameType.allCases.count) //3
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