TutorialApp.swift

  @IBAction func createAccount(sender: AnyObject) {
        let username = usernameField.text
        let email = emailField.text
        let password = passwordField.text
        
        if username != "" && email != "" && password != "" {
            
            // Set Email and Password for the New User.
            
            DataService.dataService.BASE_REF.createUser(email, password: password, withValueCompletionBlock: { error, result in
                
                if error != nil {
                    
                    // There was a problem.
                    self.signupErrorAlert("Oops!", message: "Having some trouble creating your account. Try again.")
                    
                } else {
                    
                    // Create and Login the New User with authUser
                    DataService.dataService.BASE_REF.authUser(email, password: password, withCompletionBlock: {
                        err, authData in
                        
                        let user = ["provider": authData.provider!, "email": email!, "username": username!]
                        
                        // Seal the deal in DataService.swift.
                        DataService.dataService.createNewAccount(authData.uid, user: user)
                    })
                    
                    // Store the uid for future access - handy!
                    NSUserDefaults.standardUserDefaults().setValue(result ["uid"], forKey: "uid")
                    
                    // Enter the app.
                    self.performSegueWithIdentifier("NewUserLoggedIn", sender: nil)
                }
            })
            
        } else {
            signupErrorAlert("Oops!", message: "Don't forget to enter your email, password, and a username.")
        }

    }