Handling Email Does not Exist Error - iOS project using swift - ios

Question

Here's my ResetPassword Button for my iOS application using xcode and swift:
//ResetPssword Button
#IBAction func ResetPassword(sender: AnyObject) {
if validateEmail(EmailTextField.text!) == false {
print("Enter a Valid Email Address")
let VaildMessage = "Enter an Email Address"
//Empty TextField Alert Message
self.disaplayErrorMessage(VaildMessage)
}
//Reset
else {
ref.resetPasswordForUser(EmailTextField.text) { (ErrorType) -> Void in
if ErrorType != nil {
let error = ErrorType
print("There was an error processing the request \(error.description)")
let errorMessage:String = "The Email You Entered is not Exist"
//Error Alert Message
self.disaplayErrorMessage(errorMessage)
} else {
print("Password Reset Sent Successfully")
if let Email = self.EmailTextField.text {
let successMessage = "Email Message was Sent to You at \(Email)"
//Success Alert Message
self.disaplayErrorMessage(successMessage) }
}
} //reset
} //Big Else
} //Button
//Display Alert Message With Confirmation
func disaplayErrorMessage(theMessage:String)
{
//Display alert message with confirmation.
let myAlert = UIAlertController(title: "Alert", message: theMessage, preferredStyle: UIAlertControllerStyle.Alert);
let OkAction = UIAlertAction(title: "Ok", style: UIAlertActionStyle.Default) {
action in
self.dismissViewControllerAnimated(true, completion: nil);
}
myAlert.addAction(OkAction);
self.presentViewController(myAlert, animated: true, completion: nil)
}
//Validate Email Function
func validateEmail(candidate: String) -> Bool {
let emailRegex = "[A-Z0-9a-z._%+-]+#[A-Za-z0-9.-]+\\.[A-Za-z]{2,6}"
return NSPredicate(format: "SELF MATCHES %#", emailRegex).evaluateWithObject(candidate)
}
I want to make an error that gives the user an alert when email does not exist in the firebase.
I did not know how to do that.
What I did, I gave the user an alert when error != nil
Is that the right way to do it?

Answer 1

The firebase website has a full listing of error codes
User Authentication
The pre-defined error codes provide info on pretty much all of the errors you may receive when authenticating or handling users.
ref.resetPassword({
email: EmailTextField.text!
}, function(error) {
if (error != nil) {
if let errorCode = FAuthenticationError(rawValue: error.code) {
switch (errorCode) {
case .UserDoesNotExist:
println("Handle invalid user")
case .InvalidEmail:
println("Handle invalid email")
case .InvalidPassword:
println("Handle invalid password")
default:
println("Handle default situation")
}
}
} else {
// Success!
}
}

Answer 2

According to FireBase doc here it may not always be a case. Don't put it as ErrorType, change it to error. It will be NSError type. Check code of the error you get like so:
if error != nil {
if error.description == "INVALID_USER" {
// show alert that user doesn't exists
} else {
// something went wrong
}
}
}