I want to build an iOS and Mac App that stay in sync using iCloud.

I only found an apple demo project for the mac: [PackagedDocument](https://developer.apple.com/library/mac/samplecode/PackagedDocument/Introduction/Intro.html)

Now I am looking for a simple demo app that includes both an iOS app and a Mac app. I have seen this on a WWDC Demo but this demo does not seem to be part of the demos that ship with Xcode.