Is it possible to change frame of view controller in UITabBarController so that UITabBarController view will be visible?

Question

I have my own subclass of UITabBarViewController. Is it possible to change frame for all embedded viewcontrollers' views so that own UITabBarViewController view will be visible partially?

On the attached image I set purple color for own tabBarController view. I want to change frame of each selected view controller so that this purple view (UITabBarController view) will be visible.

Answer 1

I stumbled upon this answer looking for a solution myself, and found an okayish way to handle this: wrap your viewController inside another viewController as a childViewController.

Essentially, you would present a viewController with clear background, which has your content controller as childController with a frame you want it to have:

UIViewController *wrapperController = [UIViewController new];
wrapperController.backgroundColor = [UIColor clearColor];

[wrapperController addChildViewController:vc];
[wrapperController.view addSubview:vc.view];
vc.view.frame = CGRectMake(...);

Just make sure to pass the tabbarItem to the wrapper, and use that one instead of the child.