I've just "modernized" a bunch of cross-platform code in Xcode 4.4, to use the 
new Obj-C literal and collection-access syntax. Works great when built for Mac 
OS. But now I discover that the code gets tons of compile errors on iOS because 
in the 5.1 SDK the NSArray and NSDictionary classes don't declare the 
-objectForKeyedSubscript: or -objectForIndexedSubscript: methods.

Presumably this will be remedied in the hypothetical future release of Xcode 
that includes the iOS 6 SDK. But is there anything I can do until then to make 
this build and run on iOS 5.1?

(And does this also imply that code using array/dictionary subscripting won't 
run on OS X 10.7?)

My first thought was to declare some categories on NSArray and NSDictionary to 
define those methods, but that's likely to cause issues when iOS 6 comes out 
and already includes those methods — I'll get compile errors (which I can work 
around with #ifdefs) but also a warning at launch time because the methods are 
declared in two places.

(Note that I'm _not_ asking anything about NDA'd beta software; I'm only asking 
how to make the compiler feature already available in Xcode 4.4 work on the 
already-available iOS 5.1.)

—Jens
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