LAContext: is it guaranteed that Touch Id UI will be shown every time when it's needed on iOS 8?

Privacy & Security General
Vladlex OP
Created Dec ’15
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Is it guaranteed that Touch Id UI will be shown every time when it's needed on iOS 8?


On iOS 9 there is a special property touchIDAuthenticationAllowableReuseDuration for that, so if it's value is 0, then Touch Id will be requested every time.


But on iOS 8 we have no idea about presenting UI to user when it's needed.

Is it possible that iOS 8 for some reason (because it was shown recently and user succesfully authorized multiple times, as an example) and return "success" in handler without presenting Touch ID UI?

So, it would be nice to know about guarateed behavior from Apple engineer.

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LAContext: is it guaranteed that Touch Id UI will be shown every time when it's needed on iOS 8?
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