iOS extensions with multiple targets

Question

In iOS 8, when we create an app extension, we have to decide which target it is attached to. The extension will have the same bundle ID's prefix as the target.

1. Is there any way to change the target afterward?
2. If my project contains 2 (or more) targets (for example one for debug/simulator, one for production/device), what's the best way to work with extensions? Do I need to create another extension and duplicate the code (very bothersome to keep the same code for both targets)?

Answer 1

To share one widget with others targets, you only need to add widget.appex target to Embedded Binaries for every parent target in General configuration tab

Then you'll get Embed App Extensions area at Build Phases automatically

Answer 2

This is my setup: I have 3 targets (production, staging, local) and an extension target that I don't want to duplicate 3 times.

Just to clarify Neo Chen's answer, edit each of your parent targets' schemes:

Build > Pre-actions > New Run Script Action > Provide build settings from (parent scheme).

Paste this for each extension:

#!/bin/bash  buildID=${PRODUCT_BUNDLE_IDENTIFIER} extId="notification-service"  /usr/libexec/PlistBuddy -c "Set :CFBundleIdentifier $buildID.$extId" "${SRCROOT}/${extId}/Info.plist" 

Seems to work on first build.