Is there a way to throw errors from firebase login to error handling? - swift

Question

I have one class that i call RealTimeAPI and then the actual LoginViewController class and what i want to do is i want to add my register method in my RealtimeApi class and call register in my LoginView. But then i need to errorhandle in my LoginView so i need to throw the error from the completionhandler in the registerfunction RealtimeAPIs Createuser. is this possible or no? this is my code so far.
RealtimeAPIClass
import Foundation
import Firebase
enum RegisterError: Error
{
case IncompleteForm
case NonMatchingForm
case FirebaseError
}
class RealTimeApi
{
private let Reference: DatabaseReference! = Database.database().reference()
private var nilOrNot = [Bool]()
public var errorDescription: String?
func Register(FullName: String?, Username: String?, Email: String?, EmailVerification: String?, Password: String?, PasswordVerification: String? )
{
Auth.auth().createUser(withEmail: Email!, password: Password, completion: er, Error){
}
}
func Login(Username:String, Password: String)
{
}
func CheckLoggedinUser() -> Bool
{
let currentuser = Auth.auth().currentUser
if(currentuser == nil)
{
return false
}else{
return true
}
}
}
Loginview
import UIKit
import Firebase
class LogInV: UIViewController {
#IBOutlet weak var UsernameTxt: UITextField!
#IBOutlet weak var PasswordTxt: UITextField!
#IBOutlet var TextfieldRegistrationCollection: [UITextField]!
#IBOutlet weak var ImageView: UIView!
#IBOutlet weak var RegisterView: UIView!
#IBOutlet weak var RV_VerticalAlignmentConstraint: NSLayoutConstraint!
#IBOutlet weak var RegisterBtnO: UIButton!
var Data = RealTimeApi()
var TextFieldStyle = TextfieldStyling()
override func viewDidLoad() {
super.viewDidLoad()
TextFieldStyle.StylizeTextField(StylizedTextField: UsernameTxt)
TextFieldStyle.StylizeTextField(StylizedTextField: PasswordTxt)
for i in 0...TextfieldRegistrationCollection.count - 1 {
TextFieldStyle.StylizeTextField(StylizedTextField: TextfieldRegistrationCollection[i])
}
TextfieldValidation()
RV_VerticalAlignmentConstraint.constant += view.bounds.height
}
override func viewDidAppear(_ animated: Bool) {
RegisterBtnO.isEnabled = false
}
#IBAction func LoginButtons(_ sender: UIButton) {
switch sender.tag{
case 0:
break
case 1:
Slide()
break
default:
print("button not pressed")
break
}
}
func Slide()
{
UIView.animate(withDuration: 1, delay: 0, options: .curveEaseIn, animations: {
self.RV_VerticalAlignmentConstraint.constant -= self.view.bounds.height
self.view.layoutIfNeeded()
}, completion: nil)
}
#IBAction func RegisterBtn(_ sender: UIButton) {
}
//Validate textfields so that user register does not work for empty input
func TextfieldValidation()
{
for i in 0...TextfieldRegistrationCollection.count - 1
{
TextfieldRegistrationCollection[i].addTarget(self, action: #selector(LogInV.textFieldDidChange), for: UIControlEvents.editingChanged)
}
}
//selector function for controlling empty textfield
#objc func textFieldDidChange(){
var NoneIsEmpty = Int()
for i in 0...TextfieldRegistrationCollection.count - 1{
if let text = TextfieldRegistrationCollection[i].text, text.isEmpty == false {
NoneIsEmpty += 1
}
}
if(NoneIsEmpty == TextfieldRegistrationCollection.count)
{
RegisterBtnO.isEnabled = true
}else{
RegisterBtnO.isEnabled = false
}
NoneIsEmpty = 0
}
func showAlert(error: String)
{
let Erroralert = UIAlertController(title: "Error", message: error, preferredStyle: .alert)
Erroralert.addAction(UIAlertAction(title: "Dissmiss",style: .cancel ,handler: {action in
print("tapped actionbutton")
}))
present(Erroralert, animated: true)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
}
}
func UploadCustomerList(customer: Customer)
{
}
}
So basically i want to do something like this
Auth.auth().createUser(withEmail: Email!, password: Password, completion: User, Error){
throw Error
}

Answer 1

I have created a helper class with the following method:
func setupAlert(with title: String, with message: String?, viewController: UIViewController) {
let alert = UIAlertController(title: title, message: message, preferredStyle: .alert)
let cancel = UIAlertAction(title: "OK", style: .cancel, handler: nil)
alert.addAction(cancel)
viewController.present(alert, animated: true, completion: nil)
}
you must pass the viewcontroller in the parameter where you want to display the alert. Then you can also pass the error, which can be found in Auth.auth()