For over five years, this persistent issue has affected all platforms, and despite submitting numerous feedback reports, my concerns have remained unaddressed.
When utilizing a UIHostingController within a UINavigationController, the toolbar items and title defined in the SwiftUI view manifest with a substantial delay. This delay is particularly noticeable with the introduction of Liquid Glass, resulting in a jarring transition. Although I had nearly lost hope, the issue was resolved in iOS 26 beta 3 when the push occurs from within a UISplitViewController. However, the problem persists outside of this context.
Ultimately, this issue hinders my ability to develop high-quality applications and restricts my use of SwiftUI within my UIKit project for similar purposes. I sincerely hope that this issue can be resolved, enabling me to fully rely on SwiftUI in my project. Please prioritize this matter and make the necessary changes that were already made in UISplitViewController.
This feedback has all the details and a sample project. FB14000542
Before the push:
During the push:
A second after the push finishes: