Sharing ids between apps, selecting the correct keychain

[edusperoni]

Hello!

To start things off, awesome job with this library, it does what it sets out to do very well.

I have currently 2 apps that I'd like to share the UUID with, but I'm struggling a bit understanding the shared keychain access. Usually when sharing keychains we end up with 2 keychains. Example:

bundleId.app.one, bundleId.app.shared
bundleId.app.two, bundleId.app.shared

This allows us to only share the shared keychain while keeping everything else in the private keychain. I don't see where we specify the keychain for FCUUID to use, though, so how does it work exactly? I imagined we'd need to do something like:

FCUUID.defaultAccessGroup = "bundleId.app.shared"

Any pointers on this? If this is just an unsupported feature I'm fine creating a PR with the implementation if needed

Thanks!

[fabiocaccamo]

@edusperoni I'm glad you enjoy this library!

I'm not actively working in the iOS ecosystem since a while, so I'm not up-to-date with the state of the things.

My biggest regret is not having added a test suite to this library, that would have been very good for maintaining the library along the time and accepting PRs easily.

If you want to submit a PR that would be cool, if you want to add tests too that would be awesome.