ARC stands for automatic reference counting.
I just upgraded my project to use ARC. Not all though. Just some.
How do I know?
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To see the default you have to check the target properties (Your Target -> Build Settings -> Apple LLVM Compiler – Language -> Objective-C Automatic Reference Counting)
Then you can change the setting for every .m file: Your Target -> Build Phases -> Compile sources -> you have a list of -m files and for each file a field “Compiler Flags”. To disable arc for that file pass as flag
-fno-objc-arc. To enable (if you have arc turned off by default)-fobjc-arcEDIT: i added an image of a project..
