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Minimal requirements for ARC using

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By User



In apple documentation I saw that minimal requirements for ARC is iOS 4.3, but on WWDC 2011 video they talk that minimal requirements in iOS 4.0.








On what minimal iOS version ARC will work?


Will ARC work on iOS 4.0?



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  1. Tips For AllFebruary 29, 2012 at 8:08 AM

    ARC is function of the compiler rather than the device, so technically it has nothing to do with the OS it is being used on. The difference between the two is the actual zeroing of weak references. Read this for even more info about it.

    Running an application that was compiled with ARC on a device with an OS prior to 5.0 will essentially manually zero out references rather than actually zero them out. The automatic zeroing is a core feature of ARC and is why you no longer need to call dealloc or release objects.

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  2. Tips For AllFebruary 29, 2012 at 8:08 AM

    Don't know where you saw the bit about 4.3 (do you have a link?) - but in the "Transitioning to ARC Release Notes" Apple says iOS 4.

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  3. Tips For AllFebruary 29, 2012 at 8:08 AM

    ARC is a compiler level feature. So it should work if you are able to compile your code with the latest LLVM 3 compiler. Some very old code bases (mostly old C language third party libraries) that require GCC compiler will not work (such code bases are very very rare)

    Zero-ing weak references, a run time feature that ARC takes advantage of, is not available on OSes before iOS 5/Lion. But ARC without weak references will still work.

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