swift继承-008-swift继承基本使用

//: Playground - noun: a place where people can play

import UIKit

///-----继承-------//
//1.继承是Swift中类区别于结构和枚举的唯一特征
//2.基类：任何一个不继承于其它类的类被称为基类。

//1.继承的基本使用
class Person {
    
    var name:String = ""
    var age:Int = 0
    
    
    func eat() -> String {
        
        return "\(name)在吃饭"
        
    }
    
    
    
}

class Student: Person {
    
    //定义子类中独有的属性
    var id : Int = 0
    var score : Double = 0.0
    
    func study() -> String {
        
        self.eat()
        super.eat() //调用父类方法
        
        return "\(name) 在学习"
        
    }
    
}

var p1 = Person()
p1.name = "小明"
p1.eat()

var s1 = Student()
s1.name = "小宝"
s1.study()


//2. 方法的重写：（1）必须有继承关系 （2）使用override关键字来重写父类方法
class Car {
    
    var name : String = ""
    var color : String = ""
    
    func start() {
        
        print("Car类中的启动方法")
    }
    
    
    
}

class Taxi : Car {
    
    var company : String = ""
    
    func saleTickets() {
        print("Taxi在售票")
    }
    
    //子类重写父类的方法
    override func start() {
        
        super.start()
        
        print("Taxi类重写的start方法")
    }
    
    
}

var car = Car()
car.name = "宝马"
car.color = "Black"

car.start()

var taxi = Taxi()
taxi.name = "捷达"
taxi.color = "Blue"
taxi.company = "不知名公司"

taxi.saleTickets()
taxi.start()