How to display snapshot in NavigationController with custom AnimateTransition?

Question

iOS

I need to show a snapshot of a view during an animation, but when I run this code, I get a black (transparent) screen. Snapshot added to containerView, correct frames set, isHidden = false, opaque = true.
In the screen layer debugger, the screen is in the foreground, but black (transparent).
In containerView subviews, it alone is present:

[<_UIReplicantView: 0x7ff1f34138a0; frame = (0 0; 375 667); layer = <_UIReplicantLayer: 0x600000bb57a0>>] Properties: Opaque On Hidden Off

In the transparent NavigationBar, a pink color is visible, which means there is a layer, but specifically in the part of the screen display, it is not displayed.
p.s. This problem is only in NavigationController, with normal controller everything works as expected.

func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
    guard let fromVC = transitionContext.viewController(forKey: .from),
        let fromView = fromVC.view,
        let toVC = transitionContext.viewController(forKey: .to),
        let toView = toVC.view
        else {
            return
    }

    let containerView = transitionContext.containerView

    // If remove this, toSnapshot trasparent (but in attributes alpha=1 transparent=0 opaque=false)
    fromView.removeFromSuperview()

    let toSnapshot = toView.snapshotView(afterScreenUpdates: true)!
    containerView.addSubview(toSnapshot)

    // Pritingig 
    print(containerView.subviews)

    //transitionContext.completeTransition(!transitionContext.transitionWasCancelled)
}

Answer 1

Something tells me that you absolutely do not understand the logic of transitions between VC and MAIN in what context this happens.
First: What Magic Necessity caused you to delete the controller view you're transitioning from is unclear... But how do you transition back? Going nowhere.
Second: Do you provide your animation class, here Important, not to the Controller you are passing to, but to the Navigation Controller? Something tells me no.
Thirdly: Here is a fully working version. (Worker in the sense that it does what you want. Checks omitted)
.

Text code

internal final class ModalAnimator: NSObject, UIViewControllerAnimatedTransitioning {

  private var isPresenting: Bool

  private let duration: TimeInterval = 3

  internal init(isPresenting: Bool) {
    self.isPresenting = isPresenting
  }

  internal func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
    return duration
  }

  internal func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
    guard let fromVC = transitionContext.viewController(forKey: .from),
      let toVC = transitionContext.viewController(forKey: .to),
      let snapshot = toVC.view.snapshotView(afterScreenUpdates: true)
      else { return }

    let containerView = transitionContext.containerView

    snapshot.frame = fromVC.view.frame

    containerView.addSubview(toVC.view)
    containerView.addSubview(snapshot)

    fromVC.view.isHidden = true

    UIView.animate(
      withDuration: duration,
      animations: { snapshot.transform = CGAffineTransform(rotationAngle: .pi)},
      completion: { _ in
        fromVC.view.isHidden = false
        snapshot.removeFromSuperview()
        transitionContext.completeTransition(!transitionContext.transitionWasCancelled)
    })
  }
}