Re: iOS11 Can't change shadowImage on UINavigationBar when searchController is set

I'm in the same boat.  I was able to remove the black line by changing the barStyle to ".black", but it replaced it with what looks like an image with an alpha of 0.5, so I get a lighter version of the color of both my nav bar and search bar.  Setting the shadowImage to a transparent image does nothing.

Can you report this issue as a bug? I have same problem with shadow image under navigation bar with search controller or search bar.

Same thing here...

Seems to be a bug in iOS 11.

Checking the view hierarchy Apple is now using two shadow image views - one when there is searchController and one when there is none. The shadow image view also is not a subview of the navigation bar.

Here is a hack I have used to fix this:

func fixShadowImage(inView view: UIView) {
    if let imageView = view as? UIImageView {
        let size = imageView.bounds.size.height
        if size <= 1 && size > 0 &&
            imageView.subviews.count == 0,
            let components = imageView.backgroundColor?.cgColor.components, components == [1, 1, 1, 0.15]
        {
            print("Fixing shadow image")
            let forcedBackground = UIView(frame: imageView.bounds)
            forcedBackground.backgroundColor = .white
            imageView.addSubview(forcedBackground)
            forcedBackground.autoresizingMask = [.flexibleWidth, .flexibleHeight]
        }
    }
    for subview in view.subviews {
        fixShadowImage(inView: subview)
    }
}

Search for image view with height between in 0 and 1 with white color and 0.15 alpha.

If found, add a subview with custom background color.

Usage:

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)
    if let window = view.window {
        fixShadowImage(inView: window)
    }
}

I still see this issue with iOS 11.4 on devices.  I see it on iOS 12 beta 1 simulators, too.  Wondering when Apple is going to fix this issue.

any progress?