创建一个对象

先写一个People类

////  People.swift//  Class////  Created by YouXianMing on 15/3/18.//  Copyright (c) 2015年 YouXianMing. All rights reserved.//import Foundationclass People {        // 变量值    var name : String    var age  : Int        // 初始化方法    init() {        name = "YouXianMing"        age  = 10    }    // 类方法    class func maxAge() -> Int {        return 100    }    class func minAge() -> Int {        return 0    }            // 普通方法    func info(name : String, age : Int) -> String {        return "age:\(age) + name:\(name)"    }        func subInfo() -> String {        return "age:\(age) + name:\(name)"    }}

再写一个Student类继承至People类

////  Student.swift//  Class////  Created by YouXianMing on 15/3/18.//  Copyright (c) 2015年 YouXianMing. All rights reserved.//import Foundationclass Student: People {        var score : Float    override init() {        score = 100.0                super.init()    }    }

然后是控制器源码:

////  ViewController.swift//  Class////  Created by YouXianMing on 15/3/18.//  Copyright (c) 2015年 YouXianMing. All rights reserved.//import UIKitclass ViewController: UIViewController {    // 初始化变量    var people   : People    var studuent : Student = Student()            // 必要的初始化    required init(coder aDecoder: NSCoder) {        // 调用初始化方法        people      = People()        people.name = "Y.X.M."        people.age  = 20                super.init(coder: aDecoder)    }                        override func viewDidLoad() {        super.viewDidLoad()                        println(people.info("YouXianMing", age: 28))        println(people.subInfo())        println(People.maxAge())    }}

一些需要注意的地方: