One Quickie

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Eating Brains (Debugging->gdb)

You can turn on Zombies to catch uses of objects after they have been released. Here's an easy way to do it in the gdb console:

  % gdb build/Debug/Snorkfizzle.app/Contents/MacOS/Snorkfizzle
  (gdb) set env NSZombieEnabled=YES
  (gdb) fb -[_NSZombie methodSignatureForSelector:]
  (gdb) run

Then exercise your app and trip the error.