摘要:
//AnyObject 代表任何class类型的对象实例 let man = Man.init() let woman = Woman.init() let arr:[AnyObject] = [man,woman] for people in arr { if let m = people as? Man{... 阅读全文
摘要:
//默认构造器 class Student{ var name : String = "" var number : Int = 0 } //自定义构造函数 class Person{ //雷属性 var name:String var age:Int //类构造函数 init(newName:String,newAge:Int) { ... 阅读全文