If convert project to Automatic Reference Counting(ARC), Is it still support on iOS 3.X, 4.X?

From what I can gather yes - ARC is done by the compiler and should be thought of as a wizard or helper that checks all of your code and inserts the correct retain and release statements for you This will therefore be compatible with older iOS runtimes.

From what I can gather yes - ARC is done by the compiler and should be thought of as a wizard or helper that checks all of your code and inserts the correct retain and release statements for you. This will therefore be compatible with older iOS runtimes.

Let me try. Thank you for your information. – RAGOpoR Jun 22 at 2:57 3 I'm pretty sure it's supported by 4.

X, but not earlier. – crimson_penguin Oct 14 at 1:38 1 ARC uses a compatibility library for iOS versions older than 5.0, and requires the modern runtime present in 4.0. Therefore, you can target back to 4.0, but not 3.x.

– Brad Larson Oct 25 at 16:10.

It will support iOS 4 but not iOS 3. Still, there's no full support for iOS 4 since weak references only work on iOS 5. Quoting the Transitioning to ARC Release Notes directly from Apple: ARC is supported in Xcode 4.2 for Mac OS X v10.6 and v10.7 (64-bit applications) and for iOS 4 and iOS 5.

Weak references are not supported in Mac OS X v10.6 and iOS 4.

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