When creating a UIActivity provider there are a number of methods that need to be overridden.
Mariano Abdala has created an open source project called ZYActivity containing a library that you can use to reduce the amount of boilerplate code required in creating a UIActivity provider.
ZYActivity also contains a couple of examples that you can use as a starting point in creating your own UIActivity providers.
You can find ZYActivity on Github here.
A great starting point on creating a UIActivityProvider.
Submit A Resource
Have you created a useful tutorial, library or tool for iOS development that you would like to get in front of our 300,000+ monthly page views from iOS developers?
You can submit the url here.
The resources we feel will appeal to our readers the most will be posted on the front page.