InputBarAccessoryView view does not show after Tab changed and back

Question

I am using InputBarAccessoryView for an input accessory view of my chat controller. And ChatViewController is part of UITabbarViewCntroller.

When open my chat view first time InputBarAccessoryView show but when tab change and back, it is not showing.

Can you pease help to solve that issue?

Edited:

 var messageInputBar = InputBarAccessoryView()

 override var canBecomeFirstResponder: Bool {
        return true
    }

    override var inputAccessoryView: UIView? {
        return messageInputBar
    }

Kamal