Advice on structuring an app - ios

Question

I am not positive if I am structuring my app correctly. I am using structs for the first time and I am trying to save locations from users and create users using Firebase. I want to display all users only by location. The Global.refString gets set from a UIPicker which is hard coded with 6 different locations. loadUserInfo() is not returning any information. It worked the first time I tried it but after reopening and closing the app it always returns empty. Im not sure if a struct will get saved each time I open the app. Should I use a different method to accomplish these tasks.
private func saveUserInfo(firstLastName: String, user: User!, location: String, biography: String, password: String, phoneNumber: String){
let locationRef = Global.refString
let userInfo = ["firstLastName": firstLastName, "email": user.email!, "password": password, "location": location, "phoneNumber": phoneNumber, "biography": biography, "uid": user.uid, "photoURL": String(describing: user.photoURL!)] as [String : Any]
let userRef = dataBaseRef.child(locationRef!).child(user.uid)
userRef.setValue(userInfo) { (error, ref) in
if error == nil{
print("USER SAVED")
self.logIn(email: user.email!, password: password)
}else{
print(error?.localizedDescription)
}
}
}
func loadUserInfo(){
let locationRef = Global.refString
let userRef = dataBaseRef.child(locationRef!).child(Auth.auth().currentUser!.uid)
userRef.observe(.value, with: { (snapshot) in
let user = Users(snapshot: snapshot)
if let username = user.name{
self.nameLabel.text = username
}
if let number = user.phoneNumber{
self.phone = Int(number)
}
if let userLocation = user.location{
self.bioLabel.text = userLocation
}
self.storageRef.storage.reference(forURL: imageOld).getData(maxSize: 10 * 1024 * 1024, completion: { (imgData, error) in
if error == nil {
DispatchQueue.main.async {
if let data = imgData {
self.avatar.image = UIImage(data: data)
}
}
}else {
print(error!.localizedDescription)
}
}
)}
}) { (error) in
print(error.localizedDescription)
}
}
}
struct Global
{
static var Location : String!
static var usersListSent
= [String]()
static var refString: String!
}

Answer 1

Try:
Database.database().reference().child(Global.refString).child(id).observeSingleEvent(of: .value) { (snapshot) in
if let snapshots = snapshot.children.allObjects as? [DataSnapshot] {
for snap in snapshots {
print(snap)
}
}