ハーフモーダル画面で、キーボードの高さが変わった際に、ハーフモーダル画面の高さも変えたい!!

Question

実現したいこと

https://github.com/aivars/SlideOverTutorial
を参考にハーフモーダル遷移を実装しました。
このハーフモーダル画面にtextFieldを配置し、キーボードの高さに応じてキーボードの高さも高くすることによって、端末が変わっても、textFieldが隠れないように実装したいです。

発生している問題・エラーメッセージ

keyboardWillShow(notification: NSNotification)でキーボードの高さを取得してから、どうやってハーフモーダルの高さを取得すればいいのかが解りません。
現状のコードだと、viewが大きく上に持ち上がった状態になってしまいます。
なかなか前に進めなくなってしまい、質問させて頂きました。

該当のソースコード

以下コード全文です。

import UIKit

class ViewController: UIViewController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
    }
    
    @objc func showMiracle() {
        let slideVC = OverlayView()
        slideVC.modalPresentationStyle = .custom
        slideVC.transitioningDelegate = self
        self.present(slideVC, animated: true, completion: nil)
    }
    
    @IBAction func onButton(_ sender: Any) {
        showMiracle()
    }
    
}

extension ViewController: UIViewControllerTransitioningDelegate {
    func presentationController(forPresented presented: UIViewController, presenting: UIViewController?, source: UIViewController) -> UIPresentationController? {
        PresentationController(presentedViewController: presented, presenting: presenting)
    }
}

import UIKit

class PresentationController: UIPresentationController {

  let blurEffectView: UIVisualEffectView!
  var tapGestureRecognizer: UITapGestureRecognizer = UITapGestureRecognizer()
  
  override init(presentedViewController: UIViewController, presenting presentingViewController: UIViewController?) {
      let blurEffect = UIBlurEffect(style: .dark)
      blurEffectView = UIVisualEffectView(effect: blurEffect)
      super.init(presentedViewController: presentedViewController, presenting: presentingViewController)
      tapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(dismissController))
      blurEffectView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
      self.blurEffectView.isUserInteractionEnabled = true
      self.blurEffectView.addGestureRecognizer(tapGestureRecognizer)
  }
  
  override var frameOfPresentedViewInContainerView: CGRect {
      CGRect(origin: CGPoint(x: 0, y: self.containerView!.frame.height * 0.37),
             size: CGSize(width: self.containerView!.frame.width, height: self.containerView!.frame.height *
              0.63))
  }

  override func presentationTransitionWillBegin() {
      self.blurEffectView.alpha = 0
      self.containerView?.addSubview(blurEffectView)
      self.presentedViewController.transitionCoordinator?.animate(alongsideTransition: { (UIViewControllerTransitionCoordinatorContext) in
          self.blurEffectView.alpha = 0.7
      }, completion: { (UIViewControllerTransitionCoordinatorContext) in })
  }
  
  override func dismissalTransitionWillBegin() {
      self.presentedViewController.transitionCoordinator?.animate(alongsideTransition: { (UIViewControllerTransitionCoordinatorContext) in
          self.blurEffectView.alpha = 0
      }, completion: { (UIViewControllerTransitionCoordinatorContext) in
          self.blurEffectView.removeFromSuperview()
      })
  }
  
  override func containerViewWillLayoutSubviews() {
      super.containerViewWillLayoutSubviews()
    presentedView!.roundCorners([.topLeft, .topRight], radius: 22)
  }

  override func containerViewDidLayoutSubviews() {
      super.containerViewDidLayoutSubviews()
      presentedView?.frame = frameOfPresentedViewInContainerView
      blurEffectView.frame = containerView!.bounds
  }

  @objc func dismissController(){
      self.presentedViewController.dismiss(animated: true, completion: nil)
  }
}

extension UIView {
  func roundCorners(_ corners: UIRectCorner, radius: CGFloat) {
      let path = UIBezierPath(roundedRect: bounds, byRoundingCorners: corners,
                              cornerRadii: CGSize(width: radius, height: radius))
      let mask = CAShapeLayer()
      mask.path = path.cgPath
      layer.mask = mask
  }
}

import UIKit

class OverlayView: UIViewController {
    
    @IBOutlet weak var textField: UITextField!
    var hasSetPointOrigin = false
    var pointOrigin: CGPoint?
    
    
    override func viewDidLoad() {
        super.viewDidLoad()
        let panGesture = UIPanGestureRecognizer(target: self, action: #selector(panGestureRecognizerAction))
        view.addGestureRecognizer(panGesture)
        textField.keyboardType = .namePhonePad
        textField.delegate = self
        textField.becomeFirstResponder()
        NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow), name: UIResponder.keyboardWillChangeFrameNotification, object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide), name: UIResponder.keyboardWillHideNotification, object: nil)
        
    }
    @objc func keyboardWillShow(notification: NSNotification) {
           if let keyboardSize = (notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue {
               
               
                   let suggestionHeight = self.view.frame.origin.y + keyboardSize.height
                   self.view.frame.origin.y -= suggestionHeight
               }
           }
    @objc func keyboardWillHide() {
            if self.view.frame.origin.y != 0 {
                self.view.frame.origin.y = 0
            }
        }
    override func viewWillDisappear(_ animated: Bool) {
           super.viewWillDisappear(animated)
           NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillChangeFrameNotification, object: nil)
           NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillHideNotification, object: nil)
       }
    override func viewDidLayoutSubviews() {
        if !hasSetPointOrigin {
            hasSetPointOrigin = true
            pointOrigin = self.view.frame.origin
        }
        
    }
    @objc func panGestureRecognizerAction(sender: UIPanGestureRecognizer) {
        let translation = sender.translation(in: view)
        
        // Not allowing the user to drag the view upward
        guard translation.y >= 0 else { return }
        
        // setting x as 0 because we don't want users to move the frame side ways!! Only want straight up or down
        view.frame.origin = CGPoint(x: 0, y: self.pointOrigin!.y + translation.y)
        
        if sender.state == .ended {
            let dragVelocity = sender.velocity(in: view)
            if dragVelocity.y >= 1300 {
                self.dismiss(animated: true, completion: nil)
            } else {
                // Set back to original position of the view controller
                UIView.animate(withDuration: 0.3) {
                    self.view.frame.origin = self.pointOrigin ?? CGPoint(x: 0, y: 400)
                }
            }
        }
    }
}
extension OverlayView: UITextFieldDelegate {
    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        textField.resignFirstResponder()
        return true
    }
}

補足情報（FW/ツールのバージョンなど）

ここにより詳細な情報を記載してください。

Answer 1

関数keyboardWillShowにて

self.view.frame.origin.y = self.view.frame.height * 1.22 - keyboardSize.height

である程度の高さを狙って改善しました。
完璧では無いですが、とりあえず妥協策とします。