Swift popViewController发送数据

Question

class SelectTag: UIViewController {
    var selectedTag = [0,1,2]

    @IBAction func endSelectTag(_ sender: Any) {

        self.navigationController?.popViewController(animated: true)
    }
}

我可以在运行popViewController之前添加数据吗？

我试过了

(self.parent as! MyPage).seleteTag = seletedTag

Could not cast value of type UINavigationController to MyPage