Face ID for Xcode 9 GM unable to evaluate

Question

Created Sep ’17

Replies 30

Boosts 0

Views 25k

Participants

I'm running Xcode 9 GM with iPhone X in simulator however evaluatePolicy for Face ID keeps failing. Is there a setting I am missing to use this new feature?

Xcode 9 GM
Simulator device iPhone X
Hardware > Face ID > Enrolled
Deployment Target 11.0

Below is the code referenced from docs

 let myContext = LAContext()
let myLocalizedReasonString = <#String explaining why app needs authentication#>
 
var authError: NSError?
if #available(iOS 8.0, macOS 10.12.1, *) {
    if myContext.canEvaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, error: &authError) {
        myContext.evaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, localizedReason: myLocalizedReasonString) { success, evaluateError in
            if success {
                // User authenticated successfully, take appropriate action
            } else {
                // User did not authenticate successfully, look at error and take appropriate action
            }
        }
    } else {
        // Could not evaluate policy; look at authError and present an appropriate message to user
    }
} else {
    // Fallback on earlier versions
}

Answered by Engineer in 259735022

FaceID does not work in the Xcode 9 GM due to a framework bug.

For now the best thing to do is to test on an iPhone 8 and ensure everything works with Touch ID.

Boost

Answer 1

pjmurphy OP

Sep ’17

Get same error on Xcode 9, iOS11, on iPhone X simulator. Auth error description =

Error Domain=com.apple.LocalAuthentication Code=-6 "Biometry is not available on this device."

Even if Simulator has Face ID enrolled.

The LABiometryType = 0 which is None, where 2 = FaceID, and 1 = TouchID.

I don't know if LAContext needs another parameter or something to test for FaceID verses TouchID or not, but it looks like this is still in beta for this feature, and it doesn't work yet.

0

Answer 2

prasadsg OP

Sep ’17

Looks like this release doesn't support LAContext authentication for iPhone X.

It does work on iPhone < 8, which is Touch ID enrolled.

At least we got the new iPhone X simulator!

0

Answer 3

iTen OP

Sep ’17

Yup dead on arrival !

0

Answer 4

farley OP

Sep ’17

Yup. I’m also experiencing the same bug. Interestingly, this isn’t even mentioned in the release notes for Xcode 9. As a matter of fact, Face ID is not mentioned even once in the release notes document.

0

Answer 5

Engineer OP

Apple

Sep ’17

Accepted Answer

FaceID does not work in the Xcode 9 GM due to a framework bug.

For now the best thing to do is to test on an iPhone 8 and ensure everything works with Touch ID.

0

Answer 6

prasadsg OP

Sep ’17

Thanks for the update, do keep us updated if there's a change before the official release.

0

Answer 7

tarunSH OP

Sep ’17

Did anyone check this again with new Xcode 9 released today?

0

Answer 8

michaelr OP

Sep ’17

No change - just checked.

0

Answer 9

WonderClick OP

Sep ’17

Face ID still didn't works in XCode 9.0.

b/c it's the same build number

XCode 9.0 GM build (9A235) = XCode 9.0 (9A235)

The context.biometryType = .none

0

Answer 10

Engineer OP

Apple

Sep ’17

Yes.

0

Answer 11

Matty OP

Sep ’17

Xcode 9.1 beta came out today in which this is now fixed. All Face ID options now work in the simulator.

0

Answer 12

MacTeo OP

Sep ’17

Hi Matty,

How did you manage to avoid the alert saying "This app was designed to use Touch ID and may not fully support Face ID"?

Thanks

Matteo

0

	let myContext = LAContext()
	let myLocalizedReasonString = <#String explaining why app needs authentication#>

	var authError: NSError?
	if #available(iOS 8.0, macOS 10.12.1, *) {
	if myContext.canEvaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, error: &authError) {
	myContext.evaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, localizedReason: myLocalizedReasonString) { success, evaluateError in
	if success {
	// User authenticated successfully, take appropriate action
	} else {
	// User did not authenticate successfully, look at error and take appropriate action
	}
	}
	} else {
	// Could not evaluate policy; look at authError and present an appropriate message to user
	}
	} else {
	// Fallback on earlier versions
	}