Fingerprint grace period? Doesn't require user to enter about xamarin-fingerprint

[kspearrin]

I am testing this on an iPhone 6S, iOS 9. The AllowReuse = false flag in the beta release solved it for me. Thanks.

[smstuebe]

I have noticed this behavior, too. I think iOS is caching the authentication for a while. I haven't found anything on the specification, yet. I'll try to throw the LAContext away everytime. If it solves the problem, I will fix it.

[jgfaulk]

I am experiencing this behavior as well. I found this article that may help. Specifically in the "Touch ID Enhancements" section, it mentions a new property in iOS 9 on the LAContext called touchIDAuthenticationAllowableReuseDuration.

[smstuebe]

Hey touchIDAuthenticationAllowableReuseDuration does nothing for me 😿
I tried throwing the context away and it worked. So I introduced CrossFingerprint.AllowReuse for iOS. set it to false in your AppDelegate and the dialog should appear every time you try to authenticate.

Its available on nuget as beta package https://www.nuget.org/packages/Plugin.Fingerprint/1.1.1-beta

It would be nice, if you can test it and give some feedback. A iOS 8 real device test would be really cool, too 🐱

[teimaj]

Awesome, ill aim to test it in the morning , however unfortunately i don't have a iOS 8 device with me, but ill test that when i get to work on Monday morning 😁

Thanks for the quick fix 👍

[smstuebe]

@teimaj did you test it?

[teimaj]

Sorry, i missed work most of last week due to illness, and when i got in i forgot to check. I'll make sure i do it at some point tomorrow morning.

I did realise that i don't have an iOS 8 device with Touch ID, i thought it was a iPhone 5S that i had, but it was an iPhone 5, so I'm not sure if i'll be able to put iOS 8 on a newer device.

[teimaj]

Just tested and the flag worked, however i'm unable to test on iOS 8 as i still don't have a device with it on, sorry

[smstuebe]

Ok, the only question now is, if I should use this as default setting. I didn't experience a automatic invalidation, yet.

[teimaj]

I would set this as a default setting, as it appears that most applications that use Touch ID always ask for your fingerprint regardless of time in-between each validation.

[smstuebe]

• Made it the default behavior
• removed the flag
• released 1.2.0