Firebase Authentication in iOS Swift - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the Firebase Authentication module in Swift.

iOS Swift

import [1]

Drag options to blanks, or click blank then click option'

AFoundation

BFirebaseAuth

CUIKit

DSwiftUI

Attempts:

3 left

💡 Hint

Common Mistakes

Importing UIKit or Foundation instead of FirebaseAuth.

Forgetting to import any Firebase module.

You need to import FirebaseAuth to use Firebase Authentication features in your Swift app.

2fill in blank

medium

Complete the code to sign in a user with email and password using Firebase Authentication.

iOS Swift

Auth.auth().signIn(withEmail: email, password: password) { authResult, error in
  if let error = [1] {
    print("Error signing in: \(error.localizedDescription)")
  } else {
    print("User signed in successfully")
  }
}

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Aerror

BauthResult

Cpassword

Demail

Attempts:

3 left

💡 Hint

Common Mistakes

Checking the wrong variable for errors.

Not handling the error case at all.

The error variable holds any error returned by the sign-in attempt. You check if it is not nil to handle sign-in failures.

3fill in blank

hard

Fix the error in the code to create a new user with email and password.

iOS Swift

Auth.auth().createUser(withEmail: email, password: password) { [1], error in
  if let error = error {
    print("Failed to create user: \(error.localizedDescription)")
  } else {
    print("User created successfully")
  }
}

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Aresult

Buser

Cerror

DauthResult

Attempts:

3 left

💡 Hint

Common Mistakes

Using user or result instead of authResult.

Confusing the error parameter with the first parameter.

The first closure parameter is usually named authResult to hold the user creation result.

4fill in blank

hard

Fill both blanks to send a password reset email to the user.

iOS Swift

Auth.auth().[1](withEmail: email) { error in
  if let [2] = error {
    print("Failed to send reset email: \(error.localizedDescription)")
  } else {
    print("Password reset email sent")
  }
}

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AsendPasswordReset

BresetPassword

Cerror

Dfailure

Attempts:

3 left

💡 Hint

Common Mistakes

Using a wrong method name like resetPassword.

Using a different variable name than error.

The method to send a password reset email is sendPasswordReset. The error variable is named error to check for failures.

5fill in blank

hard

Fill all three blanks to check if a user is currently signed in and print their email.

iOS Swift

if let user = Auth.auth().[1] {
  let email = user.[2]
  print("Signed in user email: \(email)")
} else {
  print("No user is signed in")
}

// To sign out the user:
try? Auth.auth().[3]()

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AcurrentUser

Bemail

CsignOut

DuserEmail

Attempts:

3 left

💡 Hint

Common Mistakes

Using a method instead of property for current user.

Accessing a non-existent property like userEmail.

Forgetting to handle sign out with try/catch.

Auth.auth().currentUser returns the current user if signed in. The user's email is accessed via email. To sign out, use signOut().