Learning Swift™ Programming

Methods

You can use a protocol to declare a method requirement. In this case, the adopting implementation must use the methods listed in the protocol in order to conform to it. Here is an example of this situation with your new Animizable protocol:

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enum Food:String {    case Meat = "meat"    case Veggies = "veggies"    case Other = "something else"}protocol Animizable {    var type:String { get }    func eat(quantityInPounds:Double, what:Food)}class Animal:Animizable {    var type = ""    func eat(quantityInPounds:Double, what:Food){        println("I am \(type) and I am eating \(quantityInPounds) pounds of           \(what.toRaw()).")    }}var human = Animal()human.type = "human"human.eat(2,what: .Meat)

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