Building iOS custom universal framework, which includes other frameworks

Building iOS custom universal framework, which includes other frameworks

I'm trying to build a framework for social media integration (so that
developers can just import this framework, make calls to APIs in this
framework and have social media actions in their app, instead of having to
import and deal with multiple SDKs and their code), following this
wonderfully written tutorial by jverkoey.
Everything seems to be going right except this little thing. I'd like to
add SDKs such as Facebook and Google Plus to my framework, so that the
developer who uses my framework will not have to import those SDKs again.
But currently, I'm unable to do that even when I build the custom
framework with those SDKs in the project and set to "Required". Any idea
on how I can get this done will be appreciated.