Do you know how to get these types of issues to show up as errors or warnings? I didn't get any warnings in my code and only discovered this issue by just using the app and noticing the behavior changed. It makes me worried that there could be other methods that stopped working that aren't as obvious as I poke around my app.

Thanks for your answer. I am subclassing UITabBarController & it uses the new tab bar look when running on iPadOS 18. Do you know where I can find documentation that there's no UITabBar when using the new tab bar UI? The documentation I have read doesn't mention this from what I remember. Plus when I print self.tabBar.frame, it gives me a value which implies there is still a UITabBar. Any more info you can give on this change would be helpful so I can ensure I am using the right methods. Thanks