Swift/Decryption in search bar - ios

Question

EDIT!!!
I got this search bar which with some data needs to decrypt it before searching. Im pretty sure I figured out where to decrypt it. But since im new, I cant really get it to work.
This is my function for filtered users. The data called "Personnr" needs to be decrypted before search.
I start by getting the String "ePersonnr" and the encryption key from the database. But when I run it, it just keeps adding a lot of profiles in the search bar?
func filterUsers (searchText:String) {
self.filteredUsers = self.usersArray.filter{ user in
var fNavn = false
var personNr = false
var searchBil = false
var telefonNr = false
var korekortNr = false
//This below is for the decryption
databaseRef.child("Buyers").queryOrdered(byChild: "ePersonnr").observe(.childAdded, with: { (snapshot) in
let key = snapshot.key
let snapshot = snapshot.value as? NSDictionary
snapshot?.setValue(key, forKey: "ePersonnr")
self.usersArray.append(snapshot)
self.ref = Database.database().reference()
self.ref.child("Encryption").child("key").observe(.value, with: { (snapshot) in
let uid = self.otherUser?["key"] as? String
self.otherUser = snapshot.value as? NSDictionary
self.otherUser?.setValue(uid, forKey: "key")
self.key1 = self.otherUser?["key1"] as? String
let input = key
let iv = self.key1
//Above is for the decryption
if let Navn = user!["Navn"] as? String {
fNavn = Navn.lowercased().contains(searchText.lowercased())
}
if let Bil = user!["Bil"] as? String {
searchBil = Bil.lowercased().contains(searchText.lowercased())
}
//Decryption of data
if let Personnr = user!["ePersonnr"] as? String {
let des = try! input.aesDecrypt(key: self.key1!, iv: iv!)
self.Personnr = des
personNr = Personnr.lowercased().contains(searchText.lowercased())
}
if let Kørekortnr = user!["Kørekortnr"] as? String {
korekortNr = Kørekortnr.lowercased().contains(searchText.lowercased())
}
if let Telefonnr = user!["Telefonnr"] as? String {
telefonNr = Telefonnr.lowercased().contains(searchText.lowercased())
}
}) { (error) in
print(error)
}
}) { (error) in
print(error)
}
return fNavn || personNr || searchBil || korekortNr || telefonNr
}
tableView.reloadData()
}
EDIT!!!
I checked in another project and the decryption works as it should. So its not the commands. It must be where to place the code. I guess.
This is how it looks like if I try to search:
https://ibb.co/cngfkb
Any ideas?