UINavigationController transition issue

Question

This is a Apple simple guide about Table Search with UISearchController, and I have downloaded the demo project and it is working well.

https://developer.apple.com/library/content/samplecode/TableSearch_UISearchController/Introduction/Intro.html

I want to have transparent navigation bar on product detail view (DetailViewController.swift). After changing some behaviors I have transition issue when going back from product detail to device list with swipe gesture(Video link below).

https://www.dropbox.com/s/denqomhhxasxv58/issue.mov?dl=0

For transparent navigation bar I have added this lines on DetailViewController viewWillAppear method

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)

    // ...

    navigationController?.navigationBar.setBackgroundImage(UIImage(), for: .default)
}

In MainTableViewController.swift I have added this code to make navigationBar default style.

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)

    navigationController?.navigationBar.setBackgroundImage(nil, for: .default)
    navigationController?.navigationBar.shadowImage = UIImage()
}

---

Also I made changes on MainTableViewController viewDidLoad method and sets this properties to true.

navigationItem.hidesSearchBarWhenScrolling = true
searchController.dimsBackgroundDuringPresentation = true

So my problem is to fix that issue. Anyone can help me?

Update:

Swipe transition from product detail to device list Search controller active state when product detail not opened Search controller active state after product detail opened