sign in manager in swift

Here's a sample code to sign in a user using Firebase authentication in Swift:

main.swift
import FirebaseAuth

// Get the email and password entered by the user
guard let email = emailTextField.text, let password = passwordTextField.text else {
    return
}

// Call Firebase authentication API to sign in
Auth.auth().signIn(withEmail: email, password: password) { (user, error) in
    // Check for errors during sign in
    if let error = error {
        print("Error during sign in: \(error.localizedDescription)")
        return
    }
    
    // Sign in successful
    print("Sign in successful for user: \(user!.email!)")
    
    // Perform any additional tasks after sign in
}
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Explanation:

1. Import FirebaseAuth library to access Firebase authentication API.
2. Get the email and password entered by the user from the text fields.
3. Call signIn method of Auth.auth() with email and password parameters to initiate sign in process.
4. Handle sign in response in the completion handler.
5. Check for any errors during sign in and print the error message.
6. If sign in successful, perform any additional tasks required for the app.
7. user parameter in the completion handler is of type User? which contains information about the signed-in user. We can use it to get various user attributes. In this sample, we're printing the user's email address after successful sign in.