In iOS 26 beta 4 (build from July 2025), there is a visual issue when using a UISplitViewController. Specifically, the text color of labels in the primary column does not adapt correctly to Dark Mode. This includes navigation bar titles and labels inside UITableViewCells. Regardless of system appearance settings, the text remains black, making it unreadable when the system switches to Dark Mode.
To reproduce this, create a new iOS project using UISplitViewController with the .doubleColumn style. In the primary column, embed a UIViewController that contains a navigation title using navigationItem.title, and a UITableView showing a list of items. Run the app on a device or simulator with iOS 26 beta 4. Then switch the system appearance to Dark Mode using Control Center and observe the interface.
The expected result is that all labels in the primary column, including the navigation title and table view cell labels, should automatically update to a light text color in Dark Mode. This behavior works correctly in iOS 18. However, the actual result is that all these labels remain black, leading to poor visibility in Dark Mode and ignoring the system’s appearance setting.