UITextView Fonts are blurring after UIScrollView Zoom IN

I have created a small project with UIScrollView, UIView, and UITextView
(hierarchy is also the same.) Then I have added UIFont to with size
14 to UITextView.
Since I want to enable zoom in/out feature for this, I have added
UIScrollViewDelegate to this controller and override viewForZooming
method.
Then zoom in/out things are working fine except one thing.
When I Zoom IN the screen, I can see Fonts which are inside the
UITextView is blurred. I want to keep the font quality according to zoom scale after zooming in the finish. So I override scrollViewDidEndZooming
and adjust the textView frame size it is not working.
After a google search, i found some answers, but I tried them but couldn't
find the solution and most of them are very old answers.
So I kindly request from you guys, please, help me to resolve this problem and I really appreciate your feedback and help. I have
attached my source code for your reference.

Code Block class ViewController: UIViewController {
    var scrollView: UIScrollView!
    var mainView: UIView!
    var textView: UITextView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        scrollView = UIScrollView(frame: .zero)
        scrollView.translatesAutoresizingMaskIntoConstraints = false
        self.view.addSubview(scrollView)
        NSLayoutConstraint.activate([
            scrollView.widthAnchor.constraint(equalTo: self.view.widthAnchor),
            scrollView.heightAnchor.constraint(equalTo: self.view.heightAnchor),
        ])
        
        mainView = UIView(frame: .zero)
        mainView.translatesAutoresizingMaskIntoConstraints = false
        mainView.backgroundColor = UIColor.red
        scrollView.addSubview(mainView)
        NSLayoutConstraint.activate([
            mainView.widthAnchor.constraint(equalToConstant: 600),
            mainView.heightAnchor.constraint(equalToConstant: 400),
            mainView.centerXAnchor.constraint(equalTo: scrollView.centerXAnchor),
            mainView.centerYAnchor.constraint(equalTo: scrollView.centerYAnchor)
        ])
        
        textView = UITextView(frame: .zero)
        textView.translatesAutoresizingMaskIntoConstraints = false
        textView.backgroundColor = UIColor.blue
        textView.font = UIFont(name: "Thonburi", size: 14)
        textView.text = "Hello World"
        textView.textAlignment = .center
        mainView.addSubview(textView)
        NSLayoutConstraint.activate([
            textView.widthAnchor.constraint(equalToConstant: 200),
            textView.heightAnchor.constraint(equalToConstant: 40),
            textView.centerXAnchor.constraint(equalTo: mainView.centerXAnchor),
            textView.centerYAnchor.constraint(equalTo: mainView.centerYAnchor),
        ])
        
        scrollView.pinchGestureRecognizer?.isEnabled = true
        scrollView.maximumZoomScale = 12.0
        scrollView.minimumZoomScale = 0.2
        scrollView.delegate = self
    }
}
extension ViewController: UIScrollViewDelegate {
    func viewForZooming(in scrollView: UIScrollView) -> UIView? {
        if let viewForZoom = scrollView.subviews.filter({$0.tag == 1}).first {
            return viewForZoom
        } else {
            return scrollView.subviews.first
        }
    }
    
    func scrollViewDidEndZooming(_ scrollView: UIScrollView, with view: UIView?, atScale scale: CGFloat) {
        self.textView.frame = CGRect(origin: textView.frame.origin, size: CGSize(width: textView.frame.width*scale, height: textView.frame.height*scale))
    }
}