我想创建一个像这样的枚举值
view.autoresizingMask = [UIViewAutoresizing.FlexibleBottomMargin, UIViewAutoresizing.FlexibleHeight]
我不知道如何设计 enum
来接受多个变量。
我想设计以下内容。
enum ActivityType: Int {
case Event = 1
case CommentOnEvent = 2
case CommentOnComment = 3
}
var activityType = [CommentOnEvent, CommentOnComment]
var activityType = Event
最佳答案
它不是一个enum
,它是一个符合OptionSetType
的struct
。您可以按照以下模式创建一个:
struct AnimalTraits : OptionSetType {
let rawValue: Int
init(rawValue: Int) { self.rawValue = rawValue }
static let LaysEggs = AnimalTraits(rawValue: 1)
static let GivesLiveBirth = AnimalTraits(rawValue: 2)
static let HasFur = AnimalTraits(rawValue: 4)
static let HasScales = AnimalTraits(rawValue: 8)
static let Mammal: AnimalTraits = [GivesLiveBirth, HasFur]
static let Fish: AnimalTraits = [LaysEggs, HasScales]
}
然后你可以像这样使用它:
struct Animal {
let name: String
let traits: AnimalTraits
}
let salmon = Animal(name: "Salmon", traits: .Fish)
salmon.traits.contains(.HasFur) //false
salmon.traits.contains(.HasScales) //true
let bizarro = Animal(name: "Fictional Animal", traits: [.LaysEggs, .GivesLiveBirth])
关于ios - swift 中的多个枚举值,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/35487403/