How to verify a user's email address on iOS with Firebase?

Question

I\'m stuck with email verification with firebase. I\'ve looked around for guidance but no help. After the user verifies his email, my code still prints out the user has not been

Answer 1

You checked if the user email was verified even before signing them in.

This is what worked for me.

    FIRAuth.auth()?.signInWithEmail(txtUsername.text!, password: txtPassword.text!) {
        (user, error) in
        if let user = FIRAuth.auth()?.currentUser {
            if !user.emailVerified{
                let alertVC = UIAlertController(title: "Error", message: "Sorry. Your email address has not yet been verified. Do you want us to send another verification email to \(self.txtUsername.text).", preferredStyle: .Alert)
                let alertActionOkay = UIAlertAction(title: "Okay", style: .Default) {
                    (_) in
                        user.sendEmailVerificationWithCompletion(nil)
                }
                let alertActionCancel = UIAlertAction(title: "Cancel", style: .Default, handler: nil)

                alertVC.addAction(alertActionOkay)
                alertVC.addAction(alertActionCancel)
                self.presentViewController(alertVC, animated: true, completion: nil)
            } else {
                print ("Email verified. Signing in...")
            }
        }
    }

Answer 2

You are using the coalescing operator after FIRAuth.auth() which means the following method call will return nil when FIRAuth.auth() was nil. If this is the case, your comparison with true will fail, since nil is not true.

I suggest you to refactor your code like this for easier debugging:

guard let auth = FIRAuth.auth(), user = auth.currentUser else {
    print("No auth / user")
}

guard user.emailVerified else {
    print("Email not verified")
    return
}

guard let email = email.text, password = passsword.text else {
    print("No email or password")
    return
}

auth.signInWithEmail(email, password: password) { user, error in
    if let error = error {
        print("Email/password is wrong or user does not exist, error: \(error)")
    } else {
        print("Successful login.")
    }
}

You should find your error easier like this.