Navigation Bar Appearance Lost When Using SwiftUI with UIKit + Introspect

[Mickael-tinytap]

Description

Hi,

I’m using a mixed UIKit and SwiftUI setup in my app. Specifically, I have a UIViewController embedded in a UINavigationController with a custom UINavigationBarAppearance.

Inside this controller, I’m embedding a SwiftUI view using UIHostingController. When I add an Introspect modifier (for example, to access the underlying UIScrollView), the navigation bar unexpectedly loses its configured appearance and becomes transparent.

I noticed there was a related issue marked as resolved, which suggested this behavior should no longer occur—but I’m still seeing the problem in the latest version.

It's happen only for nav configured as scrollEdgeAppearance.configureWithTransparentBackground(), if I set it as opaque it's still work.

Here the style of my navigationBarController

        let appearance = UINavigationBarAppearance()
        let scrollEdgeAppearance = UINavigationBarAppearance()
        
        appearance.configureWithDefaultBackground()
        appearance.backgroundEffect = UIBlurEffect(style: .systemMaterial)
        appearance.backgroundColor = .clear
        
        scrollEdgeAppearance.configureWithTransparentBackground()
        scrollEdgeAppearance.backgroundColor = .clear
        
        navigationBar.standardAppearance = appearance
        navigationBar.scrollEdgeAppearance = scrollEdgeAppearance
        navigationBar.compactAppearance = appearance
        navigationBar.compactScrollEdgeAppearance = appearance
        
        navigationBar.isTranslucent = true