Apple has provided user interface add-ons such as the UIAlertView, and modal views to allow us to alert users when we want to provide the user with information.
These add-on views aren’t always appropriate, and rather than push another view onto the stack a tutorial I came across earlier today demonstrates how to create an in-view popup which is really just another view so you can place any content that you would normally place within a view.
The tutorial is from Marin Todorov and can be found here:
Showing A Pop-up Window In iOS
Included is an example project with a library allowing you to add popups easily within your own apps. Very useful stuff.