枚举数据迅速 [英] Enums with data in swift
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问题描述
我想使用类似java的枚举,您可以在其中拥有带有自定义数据的枚举实例。例如:
I would like to use java-like enums, where you can have enum instances with custom data. For instance:
enum Country {
case Moldova(capital: "Chișinău", flagColors: [Color.Blue, Color.Yellow, Color.Red]);
case Botswana(capital: "Gaborone", flagColors: [Color.Blue, Color.White, Color.Black]);
}
我以后可以写:
Country.Moldova.capital;
似乎我可以指示变量,而不是值,我只能分配值当使用枚举时,不声明。这将是最好的模拟这种行为的方式?
It seems that I can indicate the variables, but not the values, and I can only assign the values when using the enum, not declaring. Which would be the best way to mimic this behaviour?
推荐答案
你可以做这样的事情,这可能是有帮助的: >(这是非常通用的例子)
you can do something like this, which may be helpful: (that is a very generic example only)
enum Country : Int {
case Moldova, Botwana;
//
func capital() -> String {
switch (self) {
case .Moldova:
return "Chișinău"
case .Botwana:
return "Gaborone"
default:
return ""
}
}
//
func flagColours() -> Array<UIColor> {
switch (self) {
case .Moldova:
return [UIColor.blueColor(), UIColor.yellowColor(), UIColor.redColor()]
case .Botwana:
return [UIColor.blueColor(), UIColor.whiteColor(), UIColor.blackColor()]
default:
return []
}
}
//
func all() -> (capital: String, flagColours: Array<UIColor>) {
return (capital(), flagColours())
}
//
var capitolName: String {
get {
return capital()
}
}
//
var flagColoursArray: Array<UIColor> {
get {
return flagColours()
}
}
}
那么你可以访问这样的细节:
then you can access to the details like this:
let country: Country = Country.Botwana
获取资本
这样:
get the capital
that way:
let capital: String = country.capital()
或另一个:
let capital: String = country.all().capital
或第三个:
let capital: String = country.capitolName
获取标志的颜色:
get the flag's colours:
that way:
let flagColours: Array<UIColor> = country.flagColours()
或另一个:
let flagColours: Array<UIColor> = country.all().flagColours
或第三个:
let flagColours: Array<UIColor> = country.flagColoursArray
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