How to retrieve certain childByAutoId() key - ios

Question

I have looked around for a while, with no luck. I need to get the string value of a certain dictionary key in firebase.
If you look at the image below,I need that key on top, and need to set it equal to a string, that I can segue to other viewcontrollers so when a user wants to make a post under the sharers for example, I go into the right value based on the key, then to sharers, where I can add values. Thanks, also I do not need all values, just once I have observedWithSingleEvent, I need to get the key of each page or dictionary.
my code:
let ref = FIRDatabase.database().reference()
ref.child("Notes").queryOrderedByKey().observeSingleEvent(of: .value, with: { snapshot in
if let pagers = snapshot.value as? [String : AnyObject] {
let numb = snapshot.key //what I want
for (_, val) in pagers {
if let useri = val["postUsername"] as? String {
if useri == FIRAuth.auth()?.currentUser?.uid {
let bindfl = Page()
if let title = val["title"] as? String, let descript = val["description"] as? String,
let sharers = val["sharers"] as? [String], let poster = val["postUsername"] as? String, let setter = val["setter"] as? String, let creatorName = val["creatorName"] as? String {
bindfl.title = title
bindfl.descriptions = descript
bindfl.setter = setter
bindfl.sharers = sharers
bindfl.usernameOfBinder = poster
bindfl.creatorName = creatorName
bindfl.theBit = numb
self.pages.append(bindfl)

Answer 1

Well you can do it like this, when you add data to the database
let key = ref.("Notes").childByAutoId().key
let notes = ["userName": userName,
"description": description,
"title": title,
"author": author,
"keyID": key]
let childUpdates = ["/Notes/\(key)": notes]
ref.updateChildValues(childUpdates)
After that you can, get the key like this
bindfl.title = title
bindfl.descriptions = descriptions
bindfl.userName = userName
bindfl.author= author
bindfl.keyID= keyID
Hope it worked.

Answer 2

ref.child("Notes"). observeSingleEvent(of: .childAdded, with: {snapshot in
print("\(snapshot.key)")
})
Will give you the autoID key of every entry in the table
ref.child("Notes").queryOrdered(byChild: "creatorName").queryEqual(toValue: "posterName").observeSingleEvent(of: .childAdded, with: {snapshot in
var postID = snapshot.key
//update post different post using retrieved ID
let infoToAdd = ["newPostStuff" : true]
FIREBASE_REF!.child("Posts/\(postID)").updateChildValues(infoToAdd)
})
Will give you the auto ID of every post by a given creator and then update values on a different table with the retrieved key