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If I install SDK 4.0 of the iPhone OS will I still be able to create a non 4.0 iPad app?
I would ideally like to submit a iPad app in the next month but am also hoping to develop a 4.0 iPhone app is it possible to use the 4.0 SDK to create 3.0 iPad apps or am I going to need to computers?
So far Apple has always provided a way to create Applications compatible to older versions of iPhone/iPad OS. The SDK installer will install the SDK in a version specific subdirectory. Additionally there is a “Current” directory hardlinking against the newest version. The old versions will still be available.
XCode will let you select an iPhone OS Version in the build settings and automatically figure out the correct SDK version/directory, so there’s no need to fumble with paths or include directories.