Swift -- protocol、extension

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protocol ExampleProtocol{

    var simpleDescription:String{get}

    mutating func adjust()

}

class SimpleClass:ExampleProtocol{

    var simpleDescription:String = "A very simple class"

    var anotherProperty:Int = 69105

    func adjust(){

        simpleDescription += " Now 100% requested"

    }

}

var a = SimpleClass()

print(a.simpleDescription)

a.adjust()

print(a.simpleDescription)

struct SimpleStructure:ExampleProtocol{

    var simpleDescription:String = "A simple structure"

    mutating func adjust(){

        simpleDescription += " (adjust)"

    }

}

var b = SimpleStructure()

print(b.simpleDescription)

b.adjust()

print(b.simpleDescription)

extension Int:ExampleProtocol{

    var simpleDescription:String{

        return "The number is \(self)"

    }

    mutating func adjust(){

        self += 50

    }

}

println(7.simpleDescription)

extension String:ExampleProtocol{

    var simpleDescription:String{

        return "My name is \(self)"

    }

    mutating func adjust(){}

}

print("XingXing".simpleDescription)

Swift -- protocol、extension

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原文地址：http://www.cnblogs.com/lianfu/p/5027755.html