iOS Creating a User Manual for an App

I need to add a User Manual for my App, although all the user manual examples I have seen are web-based, which is convienent because it allows you to update the documentation without updating the app but also inconvient if the user is in a off-line mode.

What I envision in a helpful usermanual would be a popovercontroller that would display relevant data to whatever the current vi开发者_JS百科ew has. It would retrieve documentation from the web and save it for later reference. Maybe even something that could take a document and break it into a plist by tag. Including gaphics would be nice also.

Are there any frameworks do to this available? ..... Or am I going to have to write my own.

How have other people implemented user manuals?