ios - querying firebase efficiently

Question

I want to search my user base from each users name value. From what I've seen online people often return all users then filter them in a table view but that doesn't seem practical nor viable. My thought was to query data and return an exponentially smaller array of values but I am having trouble using the query methods provided.

How do I query a specific aspect of my database?

How do I structure my code so that it's viable; not loading in EVERY user, something like 10 max at a time.

Any suggestions, resources, and links are greatly appreciated.

EDIT:

I did some researching and it looks like Firebase comes with some built in querying methods... So far this is what I'm attempting to test it out with the code below to print out users starting with I, but I can't get it to print any users in the console

 ref.queryOrderedByKey().queryStarting(atValue: "I").queryEnding(atValue: "Iu{f8ff}")
        .observe(.childAdded, with: { snapshot in
            print(snapshot.key)
        })

Answer 1

Waitting for answers