There are predefined extension points and templates for these points applications can utilize
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Applications can share code between extension and containing app using embedded framework.
If Extension wish to share data between containing app, then need to create an app group, and register this app group in developer portal and use the app group in containing app
An App extension lets an app to extend custom functionality and content beyond the current app and make it available to users while they are using other apps.
A high level extension – host app – containing app integration block diagram is given below
Each template includes extension point specific implementation files and settings.
References:
https://developer.apple.com/library/prerelease/ios/documentation/General/Conceptual/ExtensibilityPG/index.html#//apple_ref/doc/uid/TP40014214-CH20-SW1
References:
https://developer.apple.com/library/prerelease/ios/documentation/General/Conceptual/ExtensibilityPG/index.html#//apple_ref/doc/uid/TP40014214-CH20-SW1
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