java 里面的静态方法和swift里面的类方法是一个意思

import Foundation


class Student{
    func sayHi()
    {
        
    }

}

class Persion:Student{
    
    var _name:String
    
    init(name:String) {
        self._name = name
    }
    
    override func sayHi() {
        print("say \(self._name)")
    }
    
    class func sayHello(){
        print("hello liaojianguo")
    }
}

var student = Student()
student.sayHi()


var persion = Persion(name: "yihong")
persion.sayHi()
Persion.sayHello()