CODEWITHSUNDEEP
iosauthenticationios7xamarintouch-id
LampShade
LampShade

Reputation: 2775

Local Authentication on device with Passcode only, not TouchID

Say my app has sensitive data and I want to ensure the user authenticates locally via Passcode before accessing it. I'm using the Xamarin TouchID authentication with iOS 8 as seen in this Xamarin intro to touch ID article. I tested this out on an older device that was running iOS 7 and it obviously didn't work. So my question is, how can I do passcode authentication with iOS 7 devices? Is this only available with iOS 8?

I've noticed the iOS app Mint uses a custom Passcode. How do you implement a custom passcode that is connected to the "Enter Passcode" button in the TouchID popup? If I knew how to do that I could implement my own custom passcode so that it works for iOS 7...

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Upvotes: 2

Views: 1843

Answers (1)

Paul Cezanne
Paul Cezanne

Reputation: 8741

You cannot use Touch ID with iOS 7.

To use a custom passcode just catch the LAErrorUserFallback error in evaluatePolicy.

LAContext *context = [[LAContext alloc] init];
[context evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics
                 localizedReason:@"Your Text" reply:^(BOOL success, NSError *error) {
                     if(success) {
                     // handle success
                     } else {
                         NSString *failureReason;
                         switch (error.code) {
                             case LAErrorUserFallback:
                                // show your custom passcode screen
                                 break;
                         } 
                     }
                 }];

The code obviously needs to be finished, you need to also handle all the other error cases.

Upvotes: 2

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