摘要：
//: Playground - noun: a place where people can play import Cocoa ***************************结构体与Class类的初始化器////////// *************************结构体初始化 阅读全文
摘要：
//: Playground - noun: a place where people can play var str = "Hello, playground" //*****************************Class类的继承 定义一个父类 swift代码: 再定义个子类来继承父 阅读全文
摘要：
//: Playground - noun: a place where people can play import Cocoa var str = "Hello, playground" 定义Class类 测试类 swift代码: 运行结果: /************************* 阅读全文