LoginVC with a passed params as string

LoginVC.swift

import UIKit
import Firebase
import SwiftKeychainWrapper // I use this

class LoginVC: UIViewController, UITextFieldDelegate {
  
  // Where our shortcutItem.type is stored
  var params: String! = ""
  
  // Your @IBAction button function
  @IBAction func loginPressed(_ sender: Any) {
    
    // We make sure those two fields are not empty
    if let email = loginEmailInput.text, let password = loginPasswordInput.text {
      FIRAuth.auth()?.signIn(withEmail: email, password: password, completion: {(user, error) in
        // Your error logic goes here...
                                                                                
        // If your user is not nil, perform some action including:
        if self.params == "for example: com.github.action" {
          // Go to the ActionViewController
         else
          // Go to default page when logged in
        }                                                                      
      })
    }
  }
}