How to target a specific iPhone version?

You can use this #define to change what you build for each SDK…

#if __IPHONE_OS_VERSION_MIN_REQUIRED > __IPHONE_2_2
// iPhone 3.0 code here
#endif

And do this at run-time to run code for 3.0 and above:

float version = [[[UIDevice currentDevice] systemVersion] floatValue];
if (version >= 3.0)
    {
    // iPhone 3.0 code here
    }

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