#static library

Making a static library can be very useful for a developer that want to distribute certain functionality they have created for one or more apps but want to keep the source code to themselves. Perfect example of this could be you coded up some media streaming functionality in your app and a interested third party want to use the some of that functionality in their application. You can make an agreement with the third party that you can provide the desired functionality but do not want to give them your source code, now enters the static library. This will allow you to build your source code and create a static library for distribution so that you can share the features you created without having to give away how you made it.

If your interested in creating a Static Library here is a great little tutorial illustrating the steps to create a static library project:

http://www.amateurinmotion.com/articles/2009/02/08/creating-a-static-library-for-iphone.html

If you already have a project and want to take some of your source code and create a static library of it, then here is a nice tutorial to do that:

http://blog.stormyprods.com/2008/11/using-static-libraries-with-iphone-sdk.html

If your a little more advanced and know how to configure your source code into a static library and want to build it and combine the device and simulator static libraries into one binary, then here is a great post on stackoverflow.com for that: