At my blog
bitvectors.blogspot.com
article
Control iApp behaviors and properties with an XCode animation object
available at
http://bitvectors.blogspot.com/2014/05/control-iapp-behaviors-and-properties.html
describes XCode engineering that shows how one Xcode iApp animation object can control properties of any object within that XCode iApp. In this repository, file
DV.zip
has the complete XCode 5.1 iApp “DV” (for Dependent Variables) the article illustrates.