화면전환 segue show를 코드로 전환 방법

let storyBoard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
        let confirmViewController = storyBoard.instantiateViewController(withIdentifier: "confirms") as! ConfirmController
        if (pw == "" && pw2 == "" ){
            print("null")
        }else if pw == pw2 {
            print("equal")
            // switch screen programatically
            self.navigationController?.pushViewController(confirmViewController, animated: true)
        }else{
            print("not equal")
        }
        ```