SWIFT Enumeration(2)

之前记录了Swift Enumeration(1)，这篇算是它的延续吧，继续说下Enumeration,看以下定义

enum TrainStatus {

case OnTime

case Delay(Int) //带关联值

}

var myTrainStatus = TrainStatus.Delay(10)

用Switch 匹配对象

switch myTrainStatus{

case .OnTime:

println("Train is ontime")

case .Delay(let minutes):

println("Train delays \(minutes) minutes")

}

匹配方式是有先后顺序的，上面中先匹配到Delay然后再给里面的minutes赋值，好下面我将演示区间匹配。

switch myTrainStatus{

case .OnTime://匹配准时

println("Train is ontime")

case .Delay(1...5)://匹配1到5

println("Train delays less than five minutes")

case .Delay(6...10)://匹配6到10

println("Train delays between six and ten minutes")

case .Delay(_): //匹配其它，里面是下划线

println("Train delays more than ten minutes")

}