Share between an iOS extension and its containing app with the keychain?

Question

I understand I can share data between my share extension and its containing app by enabling app groups and using NSUserDefaults (see Sharing data between an iOS 8 share extensio

Answer 1

Use KeychainItemWrapper Class from the following link and pass your group identifier as accessgroup.

https://developer.apple.com/library/ios/samplecode/GenericKeychain/Listings/Classes_KeychainItemWrapper_m.html