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I need to test for the availability of blocks at runtime, so I can handle backwards compatibility with iOS 3. Any tips?
edit:
So far I'm doing if (!NSClassFromString(@"NSBlockOperation")) {...}
Seems to be working...
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You will also need to make sure to weak link the
libSystem.B.dylib, set your base SDK to 4.0 and deployment target to 3.1.3, as described here.A good overview on how to deal with iOS versioning issues can also be found in this this Cocoa with Love article: Tips & Tricks for conditional iOS3, iOS3.2 and iOS4 code