Firebase authentication swiftui

Question

how to fix this code it. it gives an error that can't push 2 calls must be only one. For this reason my login using firebase authentication doesn't work. i am not great with firebase i don't ge the documentation unfortunately.

// Sign up code in sessionStore

func signUp(email: String, password: String, completion: @escaping (_ error: Error?) -> Void) {
        Auth.auth().createUser(withEmail: email, password: password) { (result, error) in
        if let error = error {
            print(error.localizedDescription)
        } else {
            completion(nil)
            }
        }
    }

//sign in code for sign in view - particularly where * is placed is where i get the error that must take in one variable not 2 variables.

func signIn() {
        session.signIn(email: email, password: password) { **(result, error)** in
            if let error = error {
                self.error = error.localizedDescription
            } else {
                return
            }
        }
    }

// sign in in sessionStore

 func signIn(email: String, password: String, completion:@escaping (_ error: Error?) -> Void) {
            Auth.auth().signIn(withEmail: email, password: password) { (result, error) in
                if let error = error {
                    print(error.localizedDescription)
            } else {
                completion(nil)
                }
            }
        }

// code for sign in in sign in view also get the same error in the view

func signUp() {
        session.signUp(email: email, password: password) {(result,_ error) in
            if let error = error {
                self.error = error.localizedDescription
            } else {
                self.email = ""
                self.password = ""
            }
        }
    }

i want to store users id in the firestore so i link a user's account to their data. Older solutions on stackoverflow don't work and so i want to re-ask this question.

Answer 1

In sessionStore , your completion handler only sends back an Error? :

func signIn(email: String, password: String, completion:@escaping (_ error: Error?) -> Void) {

But, you're attempting to use both a result and error when you call it here:

session.signIn(email: email, password: password) { (result, error) in

The simplest fix, if you don't need the result , is to just change that line to:

session.signIn(email: email, password: password) { (error) in

Also, you currently aren't sending that error on in sessionStore . Add this:

func signIn(email: String, password: String, completion:@escaping (_ error: Error?) -> Void) {
            Auth.auth().signIn(withEmail: email, password: password) { (result, error) in
                if let error = error {
                    print(error.localizedDescription)
                    completion(error) //<-- Here
            } else {
                completion(nil)
                }
            }
        }

If you do need the result in your signIn function in your view, you could modify the signIn function in sessionStore to also return the result:

func signIn(email: String, password: String, completion:@escaping (AuthDataResult?,Error?) -> Void) {
  Auth.auth().signIn(withEmail: email, password: password) { (result, error) in
    completion(result, error)              
  }
}

In that case, you could keep your original (result, error) code in your view.