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Hello I have recently uploaded an application to the app store and it got approved. The issue is the application has been compiled using the 3.1 sdk, and thus is not working on 3.0 devices. Would there be any problems if i resubmitted the application compiled using the 3.0 sdk? (I want to support 3.0 because a lot of people still have not upgraded their devices, and I don’t have any feature that differ between 3.1 and 3.0)
Depending on whether or not you’re using any APIs that are restricted to version 3.0 or 3.1 you should set your base SDK as the highest version that the latest official SDK supports (not beta SDKs).
After doing that, you should then set your deployment target in your build settings to the lowest version of iPhone OS that you want your app to run on.
So if you’re not using any API’s that are specific to 3.0 you could compile against the 3.0 SDK and then set your deployment target to 2.0.
This way you benefit from most of the bug fixes brought along in the SDK update, but still retain the wide user base of people who didn’t upgrade.