I have code for multiple screens in my application. I'm trying to add in a TabBarController for the app once a user has logged in, however now the application is ignoring the login view controller. Here's my code for my login screen:
import UIKit
import CoreML
import Vision
import FirebaseAuth
class ViewController: UIViewController {
#IBOutlet weak var emailTextfield: UITextField!
#IBOutlet weak var passwordTextfield: UITextField!
#IBAction func createAccountTapped(_ sender: Any) {
if let email = emailTextfield.text, let password = passwordTextfield.text {
Auth.auth().createUser(withEmail: email, password: password, completion: { user, error in
if let firebaseError = error {
print(firebaseError.localizedDescription)
return
}
self.presentVisRecogScreen()
})
}
}
#IBAction func loginTapped(_ sender: Any) {
if let email = emailTextfield.text, let password = passwordTextfield.text {
Auth.auth().signIn(withEmail: email, password: password, completion: {(user, error) in
if let firebaseError = error {
print(firebaseError.localizedDescription)
return
}
self.presentVisRecogScreen()
})
}
}
func presentVisRecogScreen(){
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let viewController = storyboard.instantiateViewController(withIdentifier :"myTabBar")
self.present(viewController, animated: true)
}
}
It was my understanding that the application would present this screen, and once the presentVisRecogScreen function was called it would then show the Tabbed application. Where am I going wrong?
I found the issue, which I'm sure is a blatant newbie error. I hadn't ticked the box to say that my login screen was the Initial View Controller.
Works perfectly now.
Related
I am a newbie in Swift and I am learning by building a social media application.
I am struck at trying to implement self.ref.child("users").child(user.uid).setValue(["username": username]) in my code (from https://firebase.google.com/docs/database/ios/read-and-write).
I have been following the instructions of Kasey Schlaudt and at this point of the tutorial https://youtu.be/GrRggN41VF0?t=619 he tried to add a user with setValue as shown in the Firebase documentation I have linked. The errors I get in the line self.ref.child("users").child(user.uid).setValue(["username": username]) are
Use of unresolved identifier 'user' and Use of unresolved identifier 'username'.
My code so far (with some little changes from the original code in the video in my signInPress function) is
import UIKit
import Firebase
import SwiftKeychainWrapper
class ViewController: UIViewController {
#IBOutlet weak var UserImageView: UIButton!
#IBOutlet weak var usernameField: UITextField!
#IBOutlet weak var emailField: UITextField!
#IBOutlet weak var passwordField: UITextField!
override func viewDidLoad()
{
super.viewDidLoad()
}
override func viewDidAppear(_ animated: Bool)
{
if let _ : Bool = KeychainWrapper.standard.string(forKey: "uid") != nil
{
self.performSegue(withIdentifier: "toFeed", sender: nil)
}
}
func storeUserData(userID: String)
{
//---------------------------problematic line---------------------------
//from https://firebase.google.com/docs/database/ios/read-and-write
//from https://youtu.be/GrRggN41VF0?t=619
self.ref.child("users").child(user.uid).setValue(["username": username])
([
"username": usernameField.text
])
}
#IBAction func signInPress(_ sender: Any)
{
//this way you make sure there is a property inside emailField.text and you have a variable you can easily use
if let email = emailField.text, let password = passwordField.text
{
Auth.auth().signIn(withEmail: email, password: password)
{ (result, error) in
if error != nil && self.usernameField.text!.isEmpty && self.UserImageView.image != nil
{
Auth.auth().createUser(withEmail: email, password: password)
{ (result, error) in
self.storeUserData(userID: (result?.user.uid)!)
KeychainWrapper.standard.set((result?.user.uid)!, forKey: "KEY_UID")
self.performSegue(withIdentifier: "toFeed", sender: nil)
}
} else
{
KeychainWrapper.standard.set((result?.user.uid)!, forKey: "KEY_UID")
self.performSegue(withIdentifier: "toFeed", sender: nil)
}
}
}
}
}
I would very much appreciate any indication as to why the error does not occur for Kasey and what I might need to change to do the same process.
Thank you in advance !
You're actually pretty close, more of a typo issue. See that your storeUserData function is expecting a string called userID? That's what's needed in the line to store that data instead of user.uid
func storeUserData(userID: String) {
let username = self.usernameField.text
self.ref.child("users").child(userID).setValue(["username": username])
here ^^^^^^ userID instead of user.uid
}
im attempting to add user data via a create account view controller which contains all UITextFields (password, confirm password, first name, last name, phone number). when the create account button is tapped, the users email shows up in the authentication section on the firebase website but the user information from the first name, last name and phone number text fields are not passed into the database. I'm new to iOS development and have never used firebase so im unsure what the issue is. the app runs without crashing.
below is my Create Account view controller
thanks in advance
import UIKit
import FirebaseAuth
import QuartzCore
import FirebaseDatabase
import Firebase
class CreateAccount: UIViewController {
var refUsers: DatabaseReference!
#IBOutlet weak var emailTextField: UITextField!
#IBOutlet weak var passwordTextField: UITextField!
#IBOutlet weak var confirmPasswordTextField: UITextField!
#IBOutlet weak var firstNameTextField: UITextField!
#IBOutlet weak var lastNameTextField: UITextField!
#IBOutlet weak var phoneNumberTextField: UITextField!
#IBOutlet weak var alreadyHaveAccountLabel: UILabel!
#IBAction func loginButtonTapped(_ sender: Any) {
performSegue(withIdentifier: "showLoginScreen", sender: self)
}
override func viewDidLoad() {
super.viewDidLoad()
self.refUsers = Database.database().reference().child("Users");
// Do any additional setup after loading the view.
}
override func viewDidAppear(_ animated: Bool) {
if Auth.auth().currentUser != nil {
print("success")
self.presentMainScreen()
}
}
#IBAction func createAccountTapped(_ sender: Any) {
if let email = emailTextField.text, let password = passwordTextField.text {
Auth.auth().createUser(withEmail: email, password: password, completion:{ user, error in
if let firebaseError = error {
print(firebaseError.localizedDescription)
return
} else {
self.addUser()
print("this is the first name:", self.firstNameTextField.text!)
print("this is the last name:", self.lastNameTextField.text!)
print("this is the phone number" , self.phoneNumberTextField.text!)
print("success")
self.presentMainScreen()
}
})
}
}
func addUser(){
let key = refUsers.childByAutoId().key
let user = ["id":key,
"FirstName":firstNameTextField.text! as String,
"LastName":lastNameTextField.text! as String,
"PhoneNumber":phoneNumberTextField.text! as String
]
refUsers.child(key).setValue(user)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
func presentMainScreen(){
let mainstoryboard = UIStoryboard(name: "Main", bundle: nil)
let mainTabController = mainstoryboard.instantiateViewController(withIdentifier: "MainTabController") as! MainTabController
mainTabController.selectedViewController = mainTabController.viewControllers?[0]
self.present(mainTabController, animated: true, completion: nil)
//let storyboard:UIStoryboard = UIStoryboard(name:"Main", bundle:nil)
//let loggedInVC:LoggedInVC = storyboard.instantiateViewController(withIdentifier: "LoggedInVC") as! LoggedInVC
//self.present(loggedInVC, animated: true, completion: nil)
}
}
Try this:
Instead of set value use update value
let childUpdates = ["/user/\(key)": user]
refUser.updateChildValues(childUpdates)
Hope this helps :)
I'm creating a simple login signup app. But I'm getting an error, and I don't know how to fix it, please help! Here's my code:
//
// ViewController.swift
// CHLogbook-Application
//
// Created by Timothy Dillan on 06/01/18.
// Copyright © 2018 TPINC. All rights reserved.
//
import UIKit
import FirebaseAuth
import Firebase
class ViewController: UIViewController {
#IBOutlet weak var emailTextField: UITextField!
#IBOutlet weak var passwordTextField: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
}
#IBAction func createAccountTapped(_ sender: Any) {
if let email = emailTextField.text, let password = passwordTextField.text {
Auth.auth().createUser(withEmail: email, password: password, completion: { user, error in
if let firebaseError = error {
print(firebaseError.localizedDescription)
return
}
self.presentLoggedInScreen()
})
}
}
#IBAction func loginTapped(_ sender: Any) {
if let email = emailTextField.text, let password = passwordTextField.text {
Auth.auth().signIn(withEmail: email, password: password, completion: { (user, error) in
if let firebaseError = error {
print(firebaseError.localizedDescription)
return
}
self.presentLoggedInScreen()
})
}
}
func presentLoggedInScreen() {
let storyboard:UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let loggedInVC:LoggedInVC = storyboard.instantiateInitialViewController(withIdentifier:"LoggedInVC") as! LoggedInVC
self.present(loggedInVC, animated: true, completion: nil)
}
}
The error is in this line in the withIdentifier part, which, when I wanted to run it, always says "Argument passed to call that takes no arguments":
let loggedInVC:LoggedInVC = storyboard.instantiateInitialViewController(withIdentifier:"LoggedInVC") as! LoggedInVC
instantiateInitialViewController takes no arguments, it simply initializes the first view controller of the storyboard. You are looking for instantiateViewController.
let loggedInVC = storyboard.instantiateViewController(withIdentifier:"LoggedInVC") as! LoggedInVC
Do not use this Code
func presentLoggedInScreen() {
let storyboard:UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let loggedInVC:LoggedInVC = storyboard.instantiateInitialViewController(withIdentifier:"LoggedInVC") as! LoggedInVC
self.present(loggedInVC, animated: true, completion: nil)
}
Look Up first line. You instantiate new Main.Storyboard which takes memory. Use storyboard which already in memory.
func presentLoggedInScreen() {
let loggedInVC = storyboard?.instantiateInitialViewController(withIdentifier:"LoggedInVC") as! LoggedInVC
self.present(loggedInVC, animated: true, completion: nil)
}
Was wondering if anyone could help me out. I just finished my Sign Up page where the user can create an account. The problem I have now is that in the Login View the user can simply just press the Login button and it will redirect them to the next view even if their email and password are incorrect.
class LoginViewController: UIViewController, GIDSignInUIDelegate {
#IBOutlet var userEmailLoginField: UITextField!
#IBOutlet var userPasswordLoginField: UITextField!
#IBAction func loginButton(_: Any) {
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let tabBarController = storyboard.instantiateViewController(withIdentifier: "TabBarController") as! UITabBarController
let appDelegate = UIApplication.shared.delegate as! AppDelegate
appDelegate.window?.rootViewController = tabBarController
guard let email = userEmailLoginField.text, let password = userPasswordLoginField.text else { return }
FIRAuth.auth()?.signIn(withEmail: email, password: password) { (user, error) in
if let error = error {
print(error.localizedDescription)
return
}
}
}
Try moving your code that instantiates the new view controller. In the example below I moved it to only run if there is no error when authenticating with Firebase.
class LoginViewController: UIViewController, GIDSignInUIDelegate {
#IBOutlet var userEmailLoginField: UITextField!
#IBOutlet var userPasswordLoginField: UITextField!
#IBAction func loginButton(_: Any) {
guard let email = userEmailLoginField.text, let password = userPasswordLoginField.text else { return }
FIRAuth.auth()?.signIn(withEmail: email, password: password) { (user, error) in
if let error = error {
print(error.localizedDescription)
return
} else {
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let tabBarController = storyboard.instantiateViewController(withIdentifier: "TabBarController") as! UITabBarController
let appDelegate = UIApplication.shared.delegate as! AppDelegate
appDelegate.window?.rootViewController = tabBarController
}
}
}
Firebase Authentication - Can't retrieve user data after login.
I'm trying to retrieve the users email after sign in (logincontroller) and display it in a UILABEL on another controller (maincontroller). When you create a user or use an existing one, it works fine the first time after launching the app, but when you sign out and try to use another email it does not work.
I have two view controllers:
import UIKit
import Firebase
import FirebaseAuth
import FirebaseDatabase
class LoginViewController: UIViewController {
var ref: FIRDatabaseReference!
#IBOutlet weak var emailTextField: UITextField!
#IBOutlet weak var passwordTextField: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
ref = FIRDatabase.database().reference()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func signInButton(sender: AnyObject) {
FIRAuth.auth()?.signInWithEmail(emailTextField.text! , password: passwordTextField.text!, completion: { (user, error) in
if error != nil {
print(error!.localizedDescription)
}
})
self.performSegueWithIdentifier("MainViewSegue", sender: self)
}
#IBAction func createAccountButton(sender: AnyObject) {
FIRAuth.auth()?.createUserWithEmail(emailTextField.text!, password: passwordTextField.text!, completion: { (user, error) in
if error != nil {
print(error!.localizedDescription)
} else {
print("User Created.")
let userID: String = user!.uid
let userEmail:String = self.emailTextField.text!
self.ref.child("users").child(userID).setValue(["email": userEmail])
}
})
}
}
and:
import Foundation
import UIKit
import Firebase
import FirebaseDatabase
class MainViewController: UIViewController {
var ref: FIRDatabaseReference!
var refHandle: UInt!
#IBOutlet weak var userEmailLabel: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
ref = FIRDatabase.database().reference()
refHandle = ref.observeEventType(FIRDataEventType.Value, withBlock: { (snapshot) in
let dataDict = snapshot.value as! [String: AnyObject]
print((dataDict))
})
let userID: String = (FIRAuth.auth()?.currentUser?.uid)!
ref.child("users").child(userID).observeSingleEventOfType(.Value, withBlock: { (snapshot) in
let userEmail = snapshot.value!["email"] as! String
self.userEmailLabel.text = userEmail
})
}
#IBAction func signOutButton(sender: AnyObject) {
try! FIRAuth.auth()!.signOut()
if let storyboard = self.storyboard {
let viewController = storyboard.instantiateViewControllerWithIdentifier("LoginViewController")
self.presentViewController(viewController, animated: false, completion: nil)
}
}
}
This is where I get the error EXC_BAD_INSTRUCTION:
let userID: String = (FIRAuth.auth()?.currentUser?.uid)!
CMD+CLICK on signInWithEmail in FIRAuth.auth()?.signInWithEmail(emailT... and you will be directed to its documentation, above that function in its documentation you will see :-
#param completion Optionally; a block which is invoked when the sign in flow finishes, or is
canceled. Invoked asynchronously on the main thread in the future.
which means your completionBlock is invoked when your user is either signed in or signInWithEmail function has given some error.But in your case self.performSegueWithIdentifier("MainViewSegue", sender: self) will get called even before your completionBlock: is called.
Try this:-
#IBAction func signInButton(sender: AnyObject) {
FIRAuth.auth()?.signInWithEmail(emailTextField.text! , password: passwordTextField.text!, completion: { (user, error) in
if error != nil {
print(error!.localizedDescription)
}else if error == nil{
self.performSegueWithIdentifier("MainViewSegue", sender: self)
}
})
}
Also replace :-
let userID: String = (FIRAuth.auth()?.currentUser?.uid)!
with
let userID: String = FIRAuth.auth()!.currentUser!.uid
No need to forcefully unwrap an optional value which you know does exist