SWIFT Tuple Pattern及Struct Pattern

定义一个Tuple

let color = (1.0,1.0,1.0,1.0)

switch color{

case (0.0,0.5...1.0,let blue,_): //匹配第一个值为0.0第二个值为0.5到1.0第三四值为任意，并将第三个值传给blue变量

println("Blue is \(blue)")

case let (r,g,b,1.0) where r == g && g == b: //额外条件where 本个亦是的值要相等

println("Opaque grey \(r * 100)%")

default:

println("unkonw")

}

元祖就说完了，接下来定义一个Struct

struct Color {

var red:Double?

var green:Double?

var blue:Double?

var alpha:Double?

init(red:Double,green:Double,blue:Double,alpha:Double){

self.red = red

self.green = green

self.blue = blue

self.alpha = alpha

}

}

var mycolor = Color(red: 10, green: 20, blue: 60, alpha: 1.0)

switch mycolor{

case let a where a.red == 10 && a.blue == 60:

println("yes")

default:

println("unkonw")

}