Why keyboard hides when I apply custom push animation?

Question

I have two controllers with UITextFields on them. I need a custom transition between them with the keyboard shown, alongside transition.

When I'm using the default push animation, everything is good. But if I return my transition class from animationControllerForOperation, the keyboard is hiding before and showing after the transition.

So, could someone suggest to me a solution or explanation, why the keyboard is hiding with the custom transition? Transition duration = 0.4, I've set [textField becomeFirstResponder] in viewDidLoad.

Here is a video: https://www.youtube.com/watch?v=gs16tMsU4qY

Answer 1

Take a look at UIViewControllerTransitionCoordinator class.

Here is the answer to the similar issue: https://stackoverflow.com/a/21017900