cocoa touch - iOS - Folder animation in application -

How do I create an animation like a folder in my app? In the case of animation I want to do something in any sort of list. I tap on a title, and scroll down all the information below, and a new information appears (like folders or arrondon)

What is the best way to do this?

Example:

  Title Text 1 Lesson 2 Lesson 3 Tap on the title - & gt; New text under title text 1 text 2 text 3    
 
 
 told that great library Makes the folder animation completely copied.  
 Here's what it is:  
   
 Hope it helps!