Creating a universal iOS framework that includes other frameworks

Question

I am trying to create an infrastructure for integration into social networks (so that developers can simply import this framework, make calls to APIs in this structure and perform actions on social networks in their application instead of importing and processing several SDKs and their code), following This wonderfully written tutorial from jverkoey.

Everything seems to be going right except for this little thing. I would like to add SDKs such as Facebook and Google Plus to my infrastructure, so a developer who uses my infrastructure will no longer have to import these SDKs. But at the moment I can’t do this, even when I create a user infrastructure with these SDKs in the project and install “Required”. Any idea on how I can do this would be appreciated.