Swift继承

//声明一个基类

class vehicle {

var maxPassenger : Int = 0

var manufacturer : String!

func description() -> String {

return "max passenger is (maxPassenger) and manufacturer is (manufacturer)"

}

init () {

maxPassenger = 2

manufacturer = "Designed By Weasley"

}

}

//声明子类

class Bicycle : vehicle {

var numberofWheels : 2

var maxSpeed : Double = 30

override init() {

super.init()

2

}

override func description() -> String {

//return "numberofWheels : (numberofWheels) maxPassenger : (maxPassenger) with maxSpeed : (maxSpeed) manufacturer is (manufacturer)"

return super.description() + ";" + "numberofWheels : (numberofWheels) maxSpeed : (maxSpeed)"

}

}

class LimitSpeedBicycle: Bicycle {

var maxSpeed : Double {

get {

return super.maxSpeed

}

set {

super.maxSpeed = min(maxSpeed,20)

}

}

}

var bicycle = Bicycle()

println(bicycle.description())

var limit = LimitSpeedBicycle()

limit.maxSpeed = 30

println(limit.maxSpeed)

class SpeedLevel: var level = 1

Double{

didSet{

level = Int(maxSpeed / 10) + 1

}

}

String {

super.description() + " level is (level)"

}

}

var aBicycle = SpeedLevel()

aBicycle.maxSpeed = 40

println(aBicycle.description())

（编辑：李大同）

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