How does the ui change when typing the keyboard?

Question

Design

DD
When developing a design for an application, what logic should be followed when choosing the behavior of the application interface when, for example, filling out forms and the appearance of the keyboard. For example, leave the button invisible, under the keyboard, or raise it above it, moving the interface more upwards.

Answer 1

As a user, the second option is more convenient for me, I would like to see what I am doing now and one step ahead - where to poke further

Answer 2

Open your own question on the site from your phone and click on the field for writing the answer. You will see how the necessary elements will rise higher after the keyboard. And think how convenient it is.

Answer 3

I think that a virtual keyboard, if it is responsible for entering data into a specific field (and not managing the form itself, which is definitely not necessary on mobile ui) is a modal window, i.e. should cover all or part of the interface, the only addition is the input field into which text is entered from this keyboard must also be raised (actually make a new input field), expanding its size to the full screen in width and possibly in height so that insanity does not happen, when this field is not visible or it has become very small (several characters) due to the fact that other interface elements blocked it, trying to fit into the reduced screen area due to the keyboard that appeared (I saw such interfaces, you won’t look without tears).