This content was released on Jan 14 2014. The official support period is 6-months from this date.
In episode 2 of the raywenderlich.com podcast, we cover Objective-C style and runtime with Matt Galloway and Nick Waynik.
This is a companion discussion topic for the original entry at https://www.kodeco.com/2568-objective-c-style-and-runtime-the-raywenderlich-com-podcast-s01-e02