User Signup and Login with Firebase for IOS

With Parse being killed off by facebook I wanted to give Firebase a shot. Here is a simple Signup and Login example using Swift in iOS.

First, you want to go ahead and create an account. They offer a free development account, this should be enough to get you going.

This article is a big help in getting Firebase integrated into your Xcode project. https://www.firebase.com/docs/ios/quickstart.html

Below is commented code of the example.

//
//  ViewController.swift
//  firebaseLoginExample
//

import UIKit
import Firebase // 1. import Firebase

class ViewController: UIViewController {
    
    var fireBaseRef = Firebase(url: "https://hazrrd.firebaseio.com/users") // 2. Reference your applications firebase URL
    
    
    @IBOutlet weak var email: UITextField! // Setup an outlet to a email textfield
    @IBOutlet weak var password: UITextField! // Setup an outlet to a password textfield
    
    var authUID: String?
    
    override func viewDidLoad() {
        super.viewDidLoad()

        // We setup an observer to let us know the status of the user helps to know if they are logged in or not. The AuthID is key.
        fireBaseRef.observeAuthEventWithBlock { (authData) -> Void in
            if authData != nil {
                print(authData)
            }
        }
        
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

// This action is tied to a button
    @IBAction func signUp(sender: AnyObject) {
        
        guard self.email.text != "" else {
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            return
        }
        
        guard self.password.text != "" else {
            print("Password required")
            return
        }
        
        
        
        // 4. Call the createUser method which takes two arguments (email, password) both of type String
       fireBaseRef.createUser(self.email.text, password: self.password.text) { (error, result) -> Void in
            if error != nil {
                print(error) // print if an error is present
            } else {
                let userID = result["uid"] as? String // If the new user is created successfully the callback will supply a UID that is unique to the user
                print("Successfully created a new user with UID \(userID!)")
                
                // Now, creating a user does not login them in automatically, which is what we will do next. 
                // Here we will call the authUser method and pass (email, password) as we did before.
                self.fireBaseRef.authUser(self.email.text, password: self.password.text, withCompletionBlock: { (error, authData) -> Void in
                    if error != nil{
                        print(error) // print if an error is present
                    } else {
                        print("Successfully logged in new user width UID \(userID!)")
                    }
                })
                
            }
        }
   
    }
    

  
}

Here is a screenshot of a newly added user in the Firebase dashboard.