The iOS Knob Control and a new project, a framework for iOS called Violation, were both spun out of other large app projects I've been working on. The knob control came first. It resides in its own repo, has an unimaginative name that invites conflicts and is distributed simply as a single .h and .m file pair you can insert into your project.
That effort went well enough, and I was inspired to release some further custom iOS components from the same project. But the way the knob control was released would not scale to many classes, particularly with the introduction of things like base classes and private extensions.
Clearly all these things ought to share a single repo and be collected into a framework or other sort of