检查对象是否不是swift中的类型

class Person {
    var name: String

    init(name: String) {
        self.name = name
    }
}

class Student: Person {
    var studentID: String

    init(name: String, studentID: String) {
        self.studentID = studentID
        super.init(name: name)
    }
}

let person = Person(name: "John")
let student = Student(name: "Jane", studentID: "12345")

if person is Student {
    print("person is a student")
} else {
    print("person is not a student")
}

if student is Student {
    print("student is a student")
} else {
    print("student is not a student")
}

person is not a student
student is a student