UITextView automatically scrolls upwards when dragging selection handles and textContainerInset is about half the textview height

 

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class ViewController: UIViewController {
   
    @IBOutlet weak var textView: TextView!
   
    override func viewDidLoad() {
        super.viewDidLoad()
        let h = CGFloat(560)
        textView.textContainerInset = UIEdgeInsets(top: h, left: 0, bottom: 0, right: 0)
    }
   
}