How to make a secret console in IOS mobile app?

Question

Swift

How to make a secret console in the IOS mobile application?
There is a mobile application for IOS.
Such is the question, I met in a couple of applications in which there was a "secret console or debugger" when holding a certain invisible point in the application.
Can someone suggest how to do this? And is it possible?
Thank you very much!

Answer 1

A transparent button is added with some unusual click handler.

Answer 2

Here, there will be an Easter egg for the customer)