Special Memory Leak For IOS---drawinrect

http://stackoverflow.com/questions/8236837/memory-leak-drawinrect-on-ios5-0-1

I believe I have FINALLY found the cause of the memory leak. I discovered similar behavior when doing some Core Data inserts. Looping, creating many objects that are released. When run on iPad, memory usage goes up although no leak is evident until the app crashes out of memory. But when initiated from the device, it runs without a problem.

It occurred to me that its something about the way its being started from Xcode. Must be a debug setting in the project.

Turns out the problem was caused by having NSZombieEnabled while debugging. To disable this setting in Xcode 4, right click on the schemes, ie app>targetDevice, edit the scheme, select the Debug action, arguments tab. To enable NSZombieEnabled, an environment variable is created with that name with a value of YES and the variable is enabled. To disable it, uncheck the checkbox.

NSZombieEnabled is used to determine if you attempt to release an object that has already been released. To do this, the environment is keeping track of all released objects. This is consuming memory which appears as a memory leak.

Once I disabled this, my app that used to quickly grow over 115MB before being killed on an iPad1 now happily sits at 24MB with no memory leak.