Currently the only way to create re-usable code amongst different projects for the iPhone platform is to create static libraries. 3rd party frameworks (as in Mac OS X) are not supported in the iPhone SDK. Also setting up unit testing, which is a crucial part of building re-usable libraries of course, is not that trivial.
To help building static libraries for the iPhone, I decided to create a project template and file template. The project template includes 2 targets. One is the actual static library itself and the other is a unit test target. The file template simplifies creating unit test classes, by including the necessary header files and boiler plate code. I have included the Google Toolbox for Mac’s iPhone unit testing facilities and the OCMock framework in these templates.