vfr/Reader — pull request #22 by soleares (2012-10-06 00:14:09+00:00)
Title: Fix for CATiledLayer crash

I was getting crashes due to the catiledlayer's delegate not being nilled on dealloc. This fixed it for me and I haven't seen another crash in a few months. The fix is from the following:
http://stackoverflow.com/questions/6012796/ios-catiledlayer-crash