ViewController显示非原点0的对象

我在去一个新的 ViewController 新的 有 scrollView origin y: 0 . 这个 有一个 textView 原点y:0 .

模拟器 ,它向我展示了 出于某种原因,在屏幕中间的某个地方。

这是我的代码:

class addViewController: UIViewController, UIPickerViewDelegate, UIScrollViewDelegate {

     var textView = UITextView()
     var scrollView = UIScrollView()

     override func viewDidLoad() {
        super.viewDidLoad()

        scrollView.frame = CGRect(x: 0, y: 0, width: view.frame.width, height: view.frame.height)
        view.addSubview(scrollView)

        textView.frame = CGRect(x: 20.0, y: 0, width: 250.0, height: 100.0)
        textView.center = self.view.center
        textView.textAlignment = NSTextAlignment.justified
        textView.textColor = UIColor.blue
        textView.backgroundColor = UIColor.lightGray
        textView.text = "texttttt"

        scrollView.addSubview(textView)
        scrollView.contentSize = CGSize(width: view.frame.width, height: view.frame.height)
}

要做到这一点 视图控制器 视图控制器 ,这是 didSelectCellAt :

let addNoteVC = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "addViewController") as! addViewController

self.navigationController?.pushViewController(addNoteVC, animated: true)