UISplitViewController Question

Brent Simmons asks about dealing with three-level hierarcy in an adaptive split view controller (presumably for Vesper this means Tags and Note list on the left, Note details on the right).

His answer so far is here: https://gist.github.com/anonymous/797aa235dffcf9ed15e3.

And this tip is excellent:

And — bonus — @FriedLemur has the tip of the day (regarding DerivedData):

Option key turns Clean into Clean Build Folder, pretty much rm -rf

That’s so much better than me trying to remember where the DerivedData folder actually is.