Mojave: Implementing Objective-C GUIs from within R
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The move from Carbon to Cocoa on OS X has opened up wide vistas of 
graphical interface possibilities. Originally intended to provide 
interactive graphics facilities under R's new Cocoa GUI, Mojave 
provides a complete binding to the Objective-C runtime from within R, 
including the ability to specify and implement Objective-C classes from 
entirely within R. In this paper we will first introduce the 
Objective-C interaction API. Next we show the class implementation API, 
modeled on the S4 class specification API and the details of 
dispatching from Objective-C into R. Finally, we introduce work towards 
a minimal wrapper for the implementation of standalone OS X 
applications using R packages.