Can I change the iOS keyboard "Done" button

I have no idea if this is possible as I can't find any information on how to do it, but I'd like to have the "Done" button text changed to "Search" when entering input on mobile device.

I have an app (IMDB) where the input field displays the keyboard and the dismiss keyboard button says "Search".

Any idea how this is done?

I haven't written Native code yet, but I'm pretty decent at c#. Just need a little direction.

Edit: I found this from Apple which indicates the use of...

Can I change the iOS keyboard "Done" button