swift 练习三

概述//: Playground - noun: a place where people can playclass YOU{}class MyClass { var arr:Array = ["1","2"] //延迟实例化 lazy var obj = YOU() var prop:String = "hello" func mymethod

//: Playground - noun: a place where people can playclass YOU{}class MyClass {    var arr:Array = ["1","2"]    //延迟实例化    lazy var obj = YOU()    var prop:String = "hello"    func mymethod(){        print("no")    }    //类属性    static var CP:String = "类型属性"    //类方法    class func cf(){    }    //属性监视器    var total:Int = 0{        willSet(newValues){            print(newValues)        }        dIDSet{            print(oldValue)        }    }}protocol  MyProtocol{    func say(word:String)}extension MyClass:MyProtocol{    func test(){        print(self.prop)    }    func say(word: String) {        print(word)    }    //类只能扩展计算属性,要返回点什么    var calc:String{        get{            return self.prop + ",world"        }        set{           self.calc =  newValue + "888"        }    }// func getInstance(){// return self// }// convenIEnce init(){// // }    enum K{      case  A,B,C    }    subscript (outindex:Int)->String{        return self.arr[outindex]    }}MyClass.CPMyClass.cf()var my = MyClass()my.test()my.calc = "666"print(my.calc)print(my[0])MyClass.K.A

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