swift Switch

//: Playground - noun: a place where people can play

 

import UIKit

 

var str = "Hello, playground"

var a = 5

 

switch a {

    case 4:

    println("yes")

    default:

    println("nono")

}

 

var b = 11

//条件有冲突，只会执行排在前面的

 

//元组匹配

let point = (1,2)

 

switch point{

case (0,0):"在原点上"

case (_,0):"再x轴上"

case (0,_):"再y轴上"

case (-2...2,-2...2):"在指定范围以内"

default :"不在指定范围内"

}

 

let point1 = (1,2)

switch point1{

    //变量只在本case语句中有效

    case (let x,0):"再x轴上,值为\(x)"

    case (0,let y):"再y轴上,值为\(y)"

    case (let x,let y):"x值为\(x),y值为\(y)"

}

 

let point2 = (2,2)

switch point2{

    //变量只在本case语句中有效

case let(x,y) where x==y:"x和y相等"

case let(x,y) where(x>0 && y>0):"点在第一象限"

case let(x,y):"x值为\(x),y值为\(y)"

}