Stupid Simple iOS Firebase Authentication Setup

SignInSignOutViewController.swift

// AppDelegate.swift --------------------------------------------------------------------------------------------
//Add this stuff to AppDelegate (in addition to whatever is already in there) to enable Firebase and the auth-specific URL handlers

class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?


    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        //setup firebase
        FIRApp.configure()
        
        return true
    }
    
    // MARK: URL handling for OAuth
    @available(iOS 9.0, *)
    func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any]) -> Bool {
        let sourceApplication = options[UIApplicationOpenURLOptionsKey.sourceApplication] as! String?
        return self.handleOpenUrl(url, sourceApplication: sourceApplication)
    }
    
    func handleOpenUrl(_ url: URL, sourceApplication: String?) -> Bool {
        if FUIAuth.defaultAuthUI()?.handleOpen(url, sourceApplication: sourceApplication) ?? false {
            return true
        }
        // other URL handling goes here.
        return false
    }
}


// SignInSignoutViewController.swift -----------------------------------------------------------------------------
// This is the actual VC with the sign in button that will open Firebase's Auth UI.

import Foundation
import UIKit
import Firebase
import FirebaseAuthUI
import FirebaseGoogleAuthUI
import FirebaseFacebookAuthUI

class SignInSignOutViewController: UITableViewController {
    
    fileprivate var signInButtonText = "Sign In"
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        self.authStateDidChangeHandle = self.auth?.addStateDidChangeListener(self.handleAuthStateChanged(auth:user:))
        updateUI()
    }
    
    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        if let handle = self.authStateDidChangeHandle {
            self.auth?.removeStateDidChangeListener(handle)
        }
    }
    
    //MARK: table
    
    override func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }
    
    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        
        return 1
    }
    
    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        
        let cell = tableView.dequeueReusableCell(withIdentifier: "signInCell", for: indexPath)
        
        cell.textLabel?.text = signInButtonText
        
        return cell
    }
    
    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        showLoginView()
    }
    
    //MARK: Firebase auth UI stuff
    
    fileprivate var authStateDidChangeHandle: FIRAuthStateDidChangeListenerHandle?
    
    fileprivate(set) var auth: FIRAuth? = FIRAuth.auth()
    fileprivate(set) var authUI: FUIAuth? = FUIAuth.defaultAuthUI()
    
    func showLoginView() {
        if (self.auth?.currentUser) != nil {
            do {
                try self.authUI?.signOut()
            } catch let error {
                // Again, fatalError is not a graceful way to handle errors.
                // This error is most likely a network error, so retrying here
                // makes sense.
                fatalError("Could not sign out: \(error)")
            }
            
        } else {
            self.authUI?.isSignInWithEmailHidden = true
            
            // If you haven't set up your authentications correctly these buttons
            // will still appear in the UI, but they'll crash the app when tapped.
            self.authUI?.providers = [FUIGoogleAuth(), FUIFacebookAuth()]
            
            let controller = self.authUI!.authViewController()
            self.present(controller, animated: true, completion: nil)
        }
    }
    
    func handleAuthStateChanged(auth: FIRAuth, user: FIRUser?) {
        updateUI()
    }
    
    func updateUI() {
        if (self.auth?.currentUser) != nil {
            self.signInButtonText = "Sign Out";
        } else {
            self.signInButtonText = "Sign In";
        }
        
        self.tableView.reloadData()
    }
}

Sick