How to import project or library to ios app in xcode 4.3

I have downloaded an iOS project and would like to know how to import this into my app in xcode 4.3. Do I have to copy over every single .h and .m file into my project? or can I just import it as a library type thing. And if so, how?

How do you insert a framework?

To include a framework in your Xcode project, choose Project > Add to Project and select the framework directory. Alternatively, you can control-click your project group and choose Add Files > Existing Frameworks from the contextual menu.

The easiest way is just downloading the whole project, and copy the whole folder in your project (drag and drop in your project navigator)

Then, you add the .h in the class you want to use and thats all!