We’re adapting a UIKit screen for newer iOS versions and iPhone Duo. The screen has a solid navigation-bar background, navigation actions, and scrollable content underneath.
The layout behaves as expected on a regular iPhone, but Duo introduces questions around safe-area handling, navigation-item placement, scrolling transitions, and how Liquid Glass resolves its appearance when content changes beneath the navigation bar.
What is the recommended UIKit architecture for:
- Using Liquid Glass navigation actions with a visually solid navigation-bar surface.
- Keeping navigation controls correctly positioned across Duo poses, orientation changes, and resizing.
Should this be handled entirely through UINavigationController, UINavigationItem, and UINavigationBarAppearance, or are there iPhone Duo-specific APIs or patterns we should follow? We also need to preserve the existing design on iOS 18.6 while using modern behavior on newer systems. Any guidance on the intended ownership boundary between the navigation host, screen, and scroll view would be appreciated.