Here's my repository of worked examples to the projects in the Big Nerd Ranch Guide to iOS programming.
These are my solutions and I am providing them for edification only. I reserve the right to not implement the example completely, or change the requirements on a whim, or even to skip entire chapters as it suits my need. But if you are interested in digging around, feel free.
There is another Big Nerd Ranch RubyMotion repository done by Jaime Iniesta. Make sure you check that one out too.