Firebase create user with email, password, display name and photo url

Problem

In Firebase you can create user account with email and password. But what if you want to set user displayName and photo?  For that purpose after creating user with email and password you can use FIRUserProfileChangeRequest.

Algorithm

1. Create new user with email and password with completion handler with method FIRAuth.auth()?.createUser
2. In success of completion handler use method of user  user.profileChangeRequest() and set user display name changeRequest.displayName and commit changes changeRequest.commitChanges

Source Code

     /* 
     1. Create new user account with email and password.
     2. Update create account and set user display name.
     */
    func registerNewUser(email: String,
                  password: String,
                  displayName: String,
                  successHandler: ((_ uid:String) -> Void)?,
                  errorHandler: ((_ errorString: String) -> Void)?) {
        FIRAuth.auth()?.createUser(
            withEmail: email,
            password: password,
            completion: { (user, error) in
                if let error = error {
                    if let errorHandler = errorHandler {
                        errorHandler(error.localizedDescription)
                    }
                } else if let user = user {
                    let changeRequest = user.profileChangeRequest()
                    changeRequest.displayName = displayName
                    changeRequest.commitChanges(completion: { error in
                        if let error = error {
                            if let errorHandler = errorHandler {
                                errorHandler(error.localizedDescription)
                            }
                        } else if let successHandler = successHandler {
                            successHandler(user.uid)
                        }
                    })
                }
        })
    }

Link to Firebase Documentation

https://firebase.google.com/docs/auth/ios/manage-users