《iOS高级应用开发技术》实验报告八详细答案

     init(stuNo: Int, department: Department) {        self.stuNo = stuNo        self.department = department        super.init(firstName: "", lastName: "", age: 0, gender: Gender.unknow)    }        required convenience init() {        self.init(stuNo: 0, department: .one)    }        //重写父类的计算属性    override var description: String {        return "stuNo: \(self.stuNo), fullName: \(self.fullName), age: \(self.age), gender: \(self.gender), department: \(self.department)"    }        //重载父类run方法    override func run() {        print("Student \(self.fullName) is running")    }        //遵循协议的方法    func lendBook() {        print("Teacher \(self.fullName) lend a book")    }}AppDelegate.swift://添加这一句:self.window?.rootViewController=UINavigationController(rootViewController:ViewController())运行结果: