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I'm trying to install the "drop-in" authentication solution from Firebase that automatically sends your app users through Google, Facebook, or email/password screens to authenticate them.

My problem is that the code provided by Firebase appears to be in the old iOS language of Objective C instead of Swift, and that some of the lines of instructional Swift code appear outdated, and I can't find the new lines I'm supposed to use.

I'm building my code mostly from the instructions on this part of the Github drop-in solution: FirebaseUI Authentication.

This has resulted in the following code, some of which I've had to guess at, since Xcode couldn't recognize .authUI() in let authUI = FIRAuthUI.authUI(). The app doesn't crash, but it's not starting the authentication process at all, either. It's just a blank screen.

import UIKit import Firebase import FirebaseAuth import FirebaseDatabaseUI import FirebaseAuthUI import FirebaseGoogleAuthUI import FirebaseFacebookAuthUI import FBSDKCoreKit import FBSDKLoginKit class LoginController: UIViewController, FIRAuthUIDelegate { var db = FIRDatabaseReference.init() var kFacebookAppID = "15839856152xxxxx" var kGoogleClientID = "9042861xxxxx-6qq4gmeos07gpgmgt54ospv3fvpg0724.apps.googleusercontent.com" override func viewDidLoad() { super.viewDidLoad() //FIRApp.configure() let authUI = FIRAuthUI.defaultAuthUI() let facebookAuthUI = FIRFacebookAuthUI(appID: kFacebookAppID) let googleAuthUI = FIRGoogleAuthUI(clientID: kGoogleClientID) //let emailAuthUI = FIREmailPasswordAuthProvider authUI?.providers = [facebookAuthUI, googleAuthUI] // Present the auth view controller and then implement the sign in callback. let authViewController = authUI authUI?.authViewController() } func authUI(authUI: FIRAuthUI, didSignInWithUser user: FIRUser?, error: NSError?) { if error != nil { //Problem signing in }else { //User is in! } } func application(app: UIApplication, openURL url: NSURL, options: [String: AnyObject]) -> Bool { let sourceApplication = options[UIApplicationOpenURLOptionsSourceApplicationKey] as! String return FIRAuthUI.defaultAuthUI()!.handleOpenURL(url, sourceApplication: sourceApplication ?? "") ?? false } }

As a side not, I placed FIRApp.configure() inside the "didFinishLaunchingWithOptions" function in the AppDelegate class, and I have also separated FIRApp.configure() out as an override in the AppDelegate class, as shown below. Nothing seems to help. I've spent about 4 days trying to figure this out. Implementing it for Web and Android only took a few hours.

override init() { super.init() FIRApp.configure() //FIRDatabase.database().persistenceEnabled = true }
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2 Answers 2

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I finally figured out how to do this! I created a video and GIST to show how to do it, but I'll try to present it here as well.

First, I updated Xcode to version 8 by clicking "Apple App Store," finding Xcode, and clicking "Update." This took awhile to download.

Second, I updated AppDelegate.swift by adding FIRApp.configure() in the "didFinishLaunchingWithOptions" function.

Third, I added the following code to my AppDelegate.swift file:

func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any] = [:]) -> Bool { let handled = FBSDKApplicationDelegate.sharedInstance().application(app, open: url, sourceApplication: options[UIApplicationOpenURLOptionsKey.sourceApplication] as! String, annotation: options[UIApplicationOpenURLOptionsKey.annotation]) return handled || GIDSignIn.sharedInstance().handle( url, sourceApplication: options[UIApplicationOpenURLOptionsKey.sourceApplication] as! String, annotation: options[UIApplicationOpenURLOptionsKey.annotation]) }

Fourth, I updated my ViewController.swift file to this (make sure to put your own Facebook secret):

// ViewController.swift // Bizzy Books // // Created by Brad Caldwell on 9/23/16. // Copyright © 2016 Caldwell Contracting LLC. All rights reserved. // import UIKit import Firebase import FirebaseAuthUI import FirebaseDatabaseUI import FirebaseGoogleAuthUI import FirebaseFacebookAuthUI import FBSDKCoreKit import FBSDKLoginKit class ViewController: UIViewController, FIRAuthUIDelegate { //var db = FIRDatabaseReference.init() var kFacebookAppID = "PLACE YOUR 16-DIGIT FACEBOOK SECRET HERE (FOUND IN FIREBASE CONSOLE UNDER AUTHENTICATION)" override func viewDidLoad() { super.viewDidLoad() //FIRApp.configure() checkLoggedIn() } func checkLoggedIn() { FIRAuth.auth()?.addStateDidChangeListener { auth, user in if user != nil { // User is signed in. } else { // No user is signed in. self.login() } } } func login() { let authUI = FIRAuthUI.init(auth: FIRAuth.auth()!) let options = FIRApp.defaultApp()?.options let clientId = options?.clientID let googleProvider = FIRGoogleAuthUI(clientID: clientId!) let facebookProvider = FIRFacebookAuthUI(appID: kFacebookAppID) authUI?.delegate = self authUI?.providers = [googleProvider, facebookProvider] let authViewController = authUI?.authViewController() self.present(authViewController!, animated: true, completion: nil) } @IBAction func logoutUser(_ sender: AnyObject) { try! FIRAuth.auth()!.signOut() } func authUI(_ authUI: FIRAuthUI, didSignInWith user: FIRUser?, error: Error?) { if error != nil { //Problem signing in login() }else { //User is in! Here is where we code after signing in } } func application(app: UIApplication, openURL url: NSURL, options: [String: AnyObject]) -> Bool { let sourceApplication = options[UIApplicationOpenURLOptionUniversalLinksOnly] as! String return FIRAuthUI.default()!.handleOpen(url as URL, sourceApplication: sourceApplication ) } }

Fifth, I added a couple chunks of code to my Info.plist (you need to customize the Facebook and Google codes - see Jacob Sikorski's guide for more info on this.

<key>CFBundleURLTypes</key> <array> <dict> <key>CFBundleURLSchemes</key> <array> <string>com.googleusercontent.apps.PLACE YOUR LONG CODE HERE ***(mine is 12 digits followed by a dash followed by 32 alpha-numeric characters)***</string> <string>PLACE YOUR FACEBOOK CODE HERE ***(mine said fb followed by 16 numbers)***</string> </array> </dict> </array> <key>LSApplicationQueriesSchemes</key> <array> <string>fbapi</string> <string>fbapi20130214</string> <string>fbapi20130410</string> <string>fbapi20130702</string> <string>fbapi20131010</string> <string>fbapi20131219</string> <string>fbapi20140410</string> <string>fbapi20140116</string> <string>fbapi20150313</string> <string>fbapi20150629</string> <string>fbapi20160328</string> <string>fbauth</string> <string>fbauth2</string> <string>fb-messenger-api20140430</string> </array>

That should be it. Let me know if you have any questions!

Image of FirebaseUI sign-in screen

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3 Comments

I can't implement the FIRAuthUIDelegate, it says `use of undeclared type'. I have FirebaseUI in my pod file, I did all the imports, but I still get an error. Has something changed?
Iusus_vir I think they changed it to FUIAuthUIDelegate - church the notes/comments on my YouTube video for updated info
@BradCaldwell any update for phone number authentication UI or another tutorial you can recommend. I can't find any.
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You're supposed to present the auth view controller on top of your view controller.

self.presentViewController(authUI?.authViewController(), animated: true, completion: nil)

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On the line of code right before that - i.e., ' let authViewController = authUI!.authViewController() ' - I'm getting a debug note saying "Thread 1: EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0)"

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