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I truly enjoyed the tutorial located at:
However, how can I implement the user initials, adding images and message click features in swift? It appears at present that their documentation is only in objective-c.

How can I add these features in a swift app?

What specifically is ObjC - I can’t see any in that tutorial, and those features aren’t part of Firebase as far as I can see.

Their documentation is note supporting swift, they only have objective C

You’re going to have to learn to interact with an Objective C API using Swift. It’s not too hard once you learn the patterns for converting one to the other and if autocomplete is working that day you will have help.