Any finger scanning sample tutorial iPhone sdk

Question

I have been seeing many apps on appstore concerning finger scan. I would like to get a tutorial how it works or if any free/paid sdk available. The goal behind is to use finger

Answer 1

It is not possible. You can't get the user fingerprint through the iPhone screen.

In fact, the apps you mentioned are fake (and even scams if they try to make users believe they can indeed scan their fingerprint).