UINavigationController pushViewController pauses/freezes midway through

Question

I am pushing a view controller via:

[self.navigationController pushViewController:[[UIViewController alloc] init] animated:YES];

But the a

Answer 1

In app delegate, set your window's background color to white.

window?.backgroundColor = .white

Also in the the pushed view controller, set its view to white.

view.backgroundColor = .white

I experienced the same issue when programmatically embedding my view controller in a UINavigationController.