iphone - Enabling different features depending on iOS version -


in application we're building, want use uilocalnotifications, available 4.0.

checking if object responds selector pretty easy, how can go defining delegate methods on class depending on os? problem app delegate implements 

-(void)application:(uiapplication *)application didreceivelocalnotification:(uilocalnotification *)notification

method, makes application crash on startup on ios 3.2 device (ipad).

not having release multiple builds preferred.

you need use feature called “weak linking,” work ios 3.1 or later. there specific steps need follow, outlined in 4.2 “what's new” document (search “weak linking” in document).

hth!


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