UIStoryboard 连线和不连线调转

// self.performSegue(withIdentifier: "toMainViewTwo", sender: nil) //连线跳转

                        let BaseNavigationVC = UIStoryboard.init(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "BaseNavigationVC2") as! BaseNavigationViewController
                        BaseNavigationVC.modalPresentationStyle = .fullScreen
                        self.present(BaseNavigationVC, animated: true, completion:nil) //不连线跳转