Debugging with ARC and Zombies enabled
If you tried to debug your app with zombies enabled under ARC, you may have noticed that you don’t get zombies anymore. That’s most probably because of a bug in the Foundation framework that affects iOS 5 and OS X 10.7. This bug prevents ARC from "cleaning up" instance variables at deallocation-time according to Apple Technical Q&A QA1758. Apple strongly encourages you to run your app on an iOS 6+, or OS X 10.8+ system when debugging with Zombies.
In the meantime, you can workaround this bug if you are using ARC and trying to debug zombies on older systems. Just compile this NSObject+ARCZombie.m file in your project and ivars will be automatically deallocated under ARC when zombies are enabled, as it should be.
Now you might think Hey, you are swizzling dealloc, isn't that dangerous? Well, yes it is, but note that the dealloc method is only swizzled when the NSZombieEnabled environment variable is enabled, so even if this code slips in your release build, il will cause no harm at all.
UPDATE: After I posted this, Greg Parker warned me on twitter:
@0xced That'll cause over-release of associated objects on some systems.
So use this workaround with care and remember that the best solution is what Apple recommends: run your app on an iOS 6+ or OS X 10.8+ system when debugging with Zombies.
8 comments:
In you say that the image view is also strongly referenced by the view controller, hence it won't be deallocated. However, as clearly shown in ImageViewViewController, the image view outlet is a weak reference. How come?
In 23:30 you say that the image view is also strongly referenced by the view controller, hence it won't be deallocated. However, as clearly shown in ImageViewViewController, the image view outlet is a weak reference. How come?
thx for posting this! animals are so rare now in alpha 16, I FINALLY found a stag and killed it then I lagged and selected my club instead of my knife and hit the carcass and it disappeared so I had to spawn in a new one I couldn't let that go :P
thx for posting this! animals are so rare now in alpha 16, I FINALLY found a stag and killed it then I lagged and selected my club instead of my knife and hit the carcass and it disappeared so I had to spawn in a new one I couldn't let that go :P
Good to see this: "Our smart solutions improve safety and prevent accidents at entryways, in facilities and on roadways of all kinds." radar feedback signs, radar trailers, radar speed display signs.
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