When pushing from a NavigationController that has a UITabBarController as its child, the tab bar gets hidden.

[kouki-shito]

Thank you for always managing this wonderful library!

I am trying to transition from a NavigationController with a TabBarController embedded, and display a PopupBar. However, because of the relationship with the NavigationController, the PopupBar is being displayed overlapping the TabBar, which is causing an issue.

I also considered transitioning directly from the TabBarController without using the NavigationController, and tested it, but:

1. Because I am using the Coordinator Pattern, the code becomes too verbose.
2. The view I intend to transition to from the TabBarController is utilizing a NavigationBar.

For these reasons, I would prefer not to use that approach. Additionally, when trying to force a transition from a child TabBarController, the height of the PopupBar became correct, but due to the hierarchy, when I expanded the Popup, the modal could not go above the NavigationBar height.

Do you have any ideas for docking to the height of the child TabBarVC while still transitioning from the parent NavigationController, or properly adjusting the height? I have been struggling with this for several days and have reached my limit, so I would greatly appreciate any advice you may have.

For reference, I’ve attached a screen flow and a screenshot (the diagram is temporary as I am still modifying the code). I hope this helps with understanding the issue.

Note: I am Japanese, and I used ChatGPT for translation. If there are any mistakes or unclear points, please let me know.

[LeoNatan]

Hello,
Thank you for your kind words.

I’m not sure why you are embedding a tab bar controller inside a navigation controller, but this is not a recommended scenario, and is not supported by the framework. You will also find many issues inside UIKit with this scenario, but Apple might have fixed some of the issues for SwiftUI. Still not recommended.
Instead, l recommend using hidesBottomBarWhenPushed so the tab bar is hidden when pushing another controller. This is fully supported by the framework:

ScreenRecording_03-29-2025.02-21-38_1.mov

You could try to hack your way with overriding some popup bar offsets (I think those are still public API in LNPopupController), but even if you get the bar to correctly appear when a tab bar controller is visible, you will not be able to transition smoothly between states.

I suggest you rearchitect your system to correctly use controller containment as intended by UIKit.

[LeoNatan]

Looking at your screen diagram, I think you can manage with the tab controller being the root controller. Have the login controller modal, then push your messages, notifications, etc. controllers to the selected tab controller’s navigation controller. Each of those controllers should have hidesBottomBarWhenPushed=true, which will hide the tab bar when pushing.

[kouki-shito]

Thank you for your quick reply!
I was too focused on transitioning with the entire TabBarControllor, and I completely forgot that I could set a separate NavigationController for each TabPage... I will modify the code to ensure that the transition always occurs within the Page, with the TabBarController as the root. Thank you so much for your help!!!

[LeoNatan]

Cheers, happy coding!

Make sure to check the newly implemented transitions: https://github.com/LeoNatan/LNPopupController?tab=readme-ov-file#popup-transitions