Are you looking for library which simply embeds
UITextField from your own design done in storyboard? Well, then you are right place. Just download this repo and you will get an example of how to use it. It is very simple and clean to understand and you can even add more to it.
SMPinTextFieldfom Identity Inspector
getPinViewText()method from the SMPinView instance variable.
Download the repo and try it. If there is any confusion you can directly ask here.
Thanks for reading.