ios - Searching through child values Firebase / Swift

Question

My database has values sorted like this :

 Users
    UID
      Username
      Email

I'm wanting to implement a friend adding system where you search for either a username or email and it lets you add the person.

I'm able to locate users by using

 REF_USERS.queryOrdered(byChild: "displayname").queryEqual(toValue: input).observeSingleEvent(of: .value) { (snapshot: FIRDataSnapshot) in {
 print(snapshot.value)
}

With that I get the user's entire dictionary, but I'm having an issue grabbing the UID.

snapshot.key gives me "Users".

How can I grab the UID value out of the dictionary after finding the user's dictionary with either their username/email?

Answer 1

Waitting for answers