Using value(forKey: String) gives an error - ios

Question

I am trying to retrieve data from Firebase but I've run into a problem and I can't seem to solve it. Here is my code:
Database.database().reference().child("Users").child(userID!).observeSingleEvent(of: .value) { (snapshot) in
if let name = snapshot.value(forKey: "name") as? String {
userName = name
print(userName)
}
if let username = snapshot.value(forKey: "Username") as? String {
userUsername = username
print(userUsername)
}
if let email = snapshot.value(forKey: "Email") as? String {
userEmail = email
print(userEmail)
}
}
Running this gives me an error:
'NSUnknownKeyException', reason: '[
valueForUndefinedKey:]: this class is not key value coding-compliant
for the key Username.'
Here is a picture of my database:

Answer 1

First Convert snapshot value to Dictionary and then get value from it like below
Database.database().reference().child("Users").child(userID!).observeSingleEvent(of: .value) { (snapshot) in
if let data = snapshot.value as? [String: String] {
let name = data["name"]!
let email = data["email"]!
let userName = data["Username"]!
}

Answer 2

You need to cast snapshot.value which of type Any to [String:String]
Database.database().reference().child("Users").child(userID!).observeSingleEvent(of: .value) { (snapshot) in
guard let res = snapshot.value as? [String:String] else { return }
if let name = res["name"] {
userName = name
print(userName)
}
if let username = res["Username"] {
userUsername = username
print(userUsername)
}
if let email = res["Email"] {
userEmail = email
print(userEmail)
}
}