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

If you are targeting iOS 4.0 or greater, you might also consider NSRegularExpression and do more nuanced checking of the UITextField contents along the lines of this, for example.