Swift 面向对象

• Person 类

class Person {
    
    var name:String = ""
    var age:Int = 0
    
    final func think()
    {
        print("思考些什么")
    }
    
    func introduce()
    {
        print("一个人类")
    }
    
    func move() {
        print("我会移动")
    }
    
}

• Student类

class Student: Person,HumenProtocol {
    
    override func introduce() {
        print("学生的自我介绍")
    }
    
    func move(tool:String) {
        print("Student \(tool) 移动")
    }
    
    func signAgree(agree: String) {
        print("学生要遵守\(agree)")
    }
}

• Person 类的扩展

extension Person {
    
    func tool(tool:String) {
        print("人类使用的工具\(tool)")
    }
}

• 协议

protocol HumenProtocol {
    
    func signAgree(agree:String)->Void
    
}

• 实现

var p = Person()
p.introduce()
p.move()
p.think()
p.tool(tool: "斧头")

var s = Student()
s.introduce()
s.move(tool: "双腿")
s.think()
s.tool(tool: "铅笔")
s.signAgree(agree: "学校规则")