In #48 Utility Library for Keychain Access, we mentioned a wrapper for Keychain access.
Since then, there's been a few more options. Both Valet from Square and skeychain from Sam Soffes work with the Keychain on both OS X and iOS.
I have personally used sskeychain for storing API keys in the keychain, but it looks like Valet is more extensive, like having support for shared access group across apps.
PS: There's an error in the code sample in #150 which I've fixed in the archives.
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