Collapsed large title navigation bar becomes expanded after back navigation to root view controller

Question

I have UIViewController with vertical UIScrollView that has UIView as a container for all it's subviews. Here are my scrollView & contentView constraints:

        scrollView.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
        scrollView.widthAnchor.constraint(equalTo: view.safeAreaLayoutGuide.widthAnchor).isActive = true
        scrollView.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
        scrollView.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
        
        contentView.centerXAnchor.constraint(equalTo: scrollView.centerXAnchor).isActive = true
        contentView.widthAnchor.constraint(equalTo: scrollView.widthAnchor).isActive = true
        contentView.topAnchor.constraint(equalTo: scrollView.topAnchor).isActive = true
        contentView.bottomAnchor.constraint(equalTo: scrollView.bottomAnchor).isActive = true

When I scroll down my navigation bar gets smaller as it should be:

Then I click on tableviewcell, navigate to detailVC and back. That's where the problem comes in. Somehow my navigation bar gets big until I scroll it in any direction, and then it jumps to it's normal state. Why is that happening and what could be the reason?

Here is the gist with my ViewController code

Thanks!

Answer 1

I configured my constraints and fixed that issue.

New constraints:

        scrollView.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
        scrollView.widthAnchor.constraint(equalTo: view.safeAreaLayoutGuide.widthAnchor).isActive = true
        
        scrollView.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
        scrollView.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
        
        contentView.topAnchor.constraint(equalTo: scrollView.topAnchor).isActive = true
        contentView.leadingAnchor.constraint(equalTo: scrollView.leadingAnchor).isActive = true
        contentView.trailingAnchor.constraint(equalTo: scrollView.trailingAnchor).isActive = true
        contentView.bottomAnchor.constraint(equalTo: scrollView.bottomAnchor).isActive = true
       // contentView.heightAnchor.constraint(equalTo: scrollView.heightAnchor).isActive = would be true if horizontal
        contentView.widthAnchor.constraint(equalTo: scrollView.widthAnchor).isActive = true