The iOS 9 release notes indicate that a second (or subsequent) unlock with the same finger will return a value. This is useful for determining if an iPhone may be shared among different users. ... and adapting PIN codes as necessary. (for example, a mother sharing a phone with a child, both are touch enrolled)
From the release notes:
Support for reusable Touch ID matches. A match from the previous phone unlock can be used by evaluateAccessControl: and evaluatePolicy:localizedReason:reply:.
How can I leverage this to detect a new login?
I think the core issue I'm having is that I'm using Xamarin, and perhaps not interpreting the code correctly.
