How to add data to specific use reference in firebase database? - ios

Question

My current iOS requires the user to sign up and log in and once the user logs in there data is presented in the database by their user.uid and their email address they signed up with. Once the user has logged in, I want to the user to be able to store data at their specific user.uid node. For example, if "User A" is logged in and they enter some type of data, I want the data to be saved just under that user (so each user should contain their own set of data and should not be to access or modify any other users data besides there own). So my question is, what would be the best way to keep track of the logged in user or access the logged in user to store future references in later view controllers outside of just the log in controller? It's a food delivery app, so once a user is logged in, I wanted all future entered data to be saved under that user in the database.
Code for login controller:
import UIKit
import FirebaseDatabase
import FirebaseAuth
class LogInController: UIViewController {
var ref: DatabaseReference!
#IBOutlet weak var emailField: UITextField!
#IBOutlet weak var passwordField: UITextField!
func placeholders() {
emailField.placeholder = "Enter Email"
passwordField.placeholder = "Enter Password"
}
#IBAction func loginButton(_ sender: AnyObject) {
Auth.auth().signIn(withEmail: emailField.text!, password: passwordField.text!, completion: { (user, error) in
let userID: String = (user?.uid)!
let userEmail: String = self.emailField.text!
self.ref.child("Users/\(userID)").setValue(userEmail)
if error != nil {
print(error?.localizedDescription as Any)
}
else {
print("User logged in with UserID of: " + (user?.uid)!)
}
})
performSegue(withIdentifier: "signedIn", sender: self)
}
#IBAction func signoutButton(_ sender: Any) {
print("User has logged out...")
try! Auth.auth().signOut()
}
#IBAction func registerButton(_ sender: AnyObject) {
Auth.auth().createUser(withEmail: emailField.text!, password: passwordField.text!, completion: { (user, error) in
if error != nil {
print(error?.localizedDescription as Any)
return
}
print("User created with UserId of: " + (user?.uid)!)
})
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if let flavorsVC = segue.destination as? FlavorsController {
flavorsVC.ref = ref
let userEmail = emailField.text
flavorsVC.email = userEmail!
}
}
override func viewDidLoad() {
super.viewDidLoad()
placeholders()
ref = Database.database().reference()
}
So again, once the user has logged in, I want all data entered to be saved just under that logged in user on following view controllers. For example in the next view controller I have a variable bookieAmount, how could I modify my code to where each logged in user has a separate node where their individual bookieAmount can be saved to? So far when I try to implement such functionality it just replaces the previous reference and doesn't create a new for that specific user like I want it to.
Code for next view controller:
class FlavorsController: UIViewController, UITableViewDelegate, UITableViewDataSource {
var bookieFlavors = ["Chocolate Chip", "Sugar w/o icing", "Sugar w/ icing", "Peanut Butter", "Honey", "Shortbread", "Ginger", "Double Chocolate", "Macadamie Nut", "Oatmeal Raisin", "Snickerdoodle"]
var amount = [Int]()
var bookieTotal = Int()
var ref: DatabaseReference!
var flavorRef: DatabaseReference!
var email = String()
override func viewDidLoad() {
super.viewDidLoad()
for _ in self.bookieFlavors {
self.amount.append(0)
}
flavorTable.delegate = self
flavorTable.dataSource = self
//database references
ref = Database.database().reference()
flavorRef = Database.database().reference()
}
func emptyAmount(_ sender: UIButton) {
print("Button Held, Amount Emptied")
self.amount[sender.tag] = self.amount[sender.tag] - (self.amount[sender.tag] + 1)
let cell = self.flavorTable.cellForRow(at: IndexPath(row: sender.tag, section: 0)) as? FlavorTableCell
cell?.bookieAmount.text = "= \(self.amount[sender.tag])"
}
#IBAction func bookieButton(_ sender: UIButton) {
self.amount[sender.tag] = self.amount[sender.tag] + 1
let cell = self.flavorTable.cellForRow(at: IndexPath(row: sender.tag, section: 0)) as? FlavorTableCell
cell?.bookieAmount.text = "= \(self.amount[sender.tag])"
// print(amount[sender.tag])
self.bookieTotal = amount.reduce(0, +)
print(bookieTotal)
}
#IBOutlet weak var flavorTable: UITableView!
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int
{
return bookieFlavors.count
}
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
public func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
{
let cell = tableView.dequeueReusableCell(withIdentifier: "cell") as! FlavorTableCell
//flavor label configuration
cell.flavorLabel.text = bookieFlavors[indexPath.row]
//amount configuration
cell.bookieAmount.text = "= \(self.amount[indexPath.row])"
cell.bookieButton.tag = indexPath.row
cell.bookieButton.addTarget(self, action: #selector(bookieButton(_:)), for: .touchUpInside)
cell.bookieButton.addTarget(self, action: #selector(emptyAmount(_:)), for: .touchDownRepeat)
return cell
}
#IBAction func registerBookieAmount(_ sender: Any) {
print(bookieTotal)
let amount: Int = bookieTotal
let user = Auth.auth().currentUser
if ((user) != nil) {
}
}

Answer 1

What you can do is to make a request to Firebase server to see if the user is still logged in by this code
if Auth.auth().currentUser != nil {
// User is signed in.
let ref = Database.database().reference()
ref.child("users").child(user.uid).child("orders").setValue(["order": orderNumber])
} else {
// No user is signed in.
}