Hey there,
I understand that you're looking for a iOS native developer who knows spine2D animation and is ready to create demo for you. Well, I am delighted to inform you that I can certainly work on this project, as I have years of experience with iOS.
I have downloaded the ZIP file which you've attached and gone through the character images. So, if you have any questions or concerns, please let me know and we can get started ASAP.
Warm wishes,
Wasif