[英]Multiple enum value in swift
我想創建一個枚舉值
view.autoresizingMask = [UIViewAutoresizing.FlexibleBottomMargin, UIViewAutoresizing.FlexibleHeight]
我不知道要設計enum
來接受多個變量。
我想設計以下。
enum ActivityType: Int {
case Event = 1
case CommentOnEvent = 2
case CommentOnComment = 3
}
var activityType = [CommentOnEvent, CommentOnComment]
var activityType = Event
它不是一個enum
,而是一個符合OptionSetType
的struct
。 您可以按照以下模式創建一個:
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,您可以像這樣使用它:
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])
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.