iOS how to implement speaker diarization (who speak)?

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Objective-C

iOS

I am trying to detect persons voice from audio file that who speaks?

I have research and found that "Speaker diarization" will work but i don't know how to use this in iOS?

Actually my requirement is that

Person1 Says "Hi" then save the "Person1" in db
Person2 Says "Hi" then save the "Person2" in db
Person1 Says "Hi" then identify that this is "Person1" voice and return "Person1" from db.

But sounds difficult for me so I have decided to detect persons from audio file for now.

Please give some ideas for this. A big thanks in advance.

What I have tried:

I have implemented speech framework in ios 10