类似于如何定位特定的iPhone版本？

您可以使用此#define更改为每个SDK构建的内容...

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
}