Tutorial :iPhone, check for existence of constant


How can you check if a constant is set at runtime? For instance, in iOS 4, UIApplicationDidEnterBackgroundNotification is available, but when running on iOS 3 it will through an error if you try to use it.


You should probably look at this other question, which in my opinion also answers yours. if (&UIApplicationWillEnterForegroundNotification != NULL) should be dynamic-linking-safe and tell you whether the constant exists or not.

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