How to check if UITextField's text is valid email?

Question

I have a view controller with 3 UITextFields (username, email, and password).

I need a method that checks first, if all fields have text in them, then check if the e

Answer 1

Following code is use for the checking the validation of the email id using the Regex(Regular expresion).

(BOOL) validateEmail: (NSString *) candidate {
    NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
    NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex]; //  return 0;
    return [emailTest evaluateWithObject:candidate];
}