Swift 面向对象

 1 import Foundation
 2 
 3 class Hi{
 4     func sayHi(){
 5         print("HI jinpanpang")
 6     }
 7 }
 8 
 9 class  Hello:Hi {
10     var _name:String
11     
12     // 有参构造函数
13     init(name:String) {
14         self._name = name
15         print("init hello")
16     }
17     
18     // 重写父类方法
19     override func sayHi() {
20         print("override \(self._name)")
21     }
22 }
23 
24 var hi = Hi()
25 hi.sayHi();
26 
27 var h = Hello(name: "zhangsan")
28 h.sayHi();
29 
30 /* 输出结果
31 HI jinpanpang
32 init hello
33 override zhangsan
34 Program ended with exit code: 0
35 */