At first you should creare static library. @Antonio MG gave a great suggestion about Creating a Static Library in iOS.
After that you can create framework from static lib and headers. How to do this you can see in this SO question.
Pergunta
Is it possible to create an own obj-C Cocoa Touch framework by using classes created already.How can I make it useful for others by converting into a custom framework using Xcode?
Anyone can help me? Thanks in advance.
Solução
At first you should creare static library. @Antonio MG gave a great suggestion about Creating a Static Library in iOS.
After that you can create framework from static lib and headers. How to do this you can see in this SO question.