I share a framework between an app and it's action extension. The framework uses API that is not available to extensions.
My question is: Is the app going to get rejected if I keep there references to APIs such as UIApplication.sharedApplication without actually calling them (setting “Require Only App-Extension-Safe API” to NO), or do I need to completely remove any references from the code (i.e. using #ifdef)?
Yes it will be rejected even if it references restricted APIs. We are going through the same process to remove such calls in our framework, alternatively you can have two targets for your framework, one extension-safe and one not with #ifdef guards.
Apple docs: (https://developer.apple.com/library/prerelease/ios/documentation/General/Conceptual/ExtensibilityPG/ExtensionScenarios.html)
If you have a custom framework that does contain such APIs, you can safely link to it from your containing app but cannot share that code with the app’s contained extensions. The App Store rejects any app extension that links to such frameworks or that otherwise uses unavailable APIs."