IPhone : Touch ID freezes AVCaptureDevice

on Saturday, April 18, 2015

I have an AVCaptureDevice to show a camera preview on screen.


When I overlay Touch ID (CAContext's evaluatePolicy) on the camera preview, the camera preview freezes.


This is especially problematic because, when the Touch ID view is dismissed, the camera preview flashes a black screen for a fraction of a second.


How can I keep the camera preview alive with the Touch ID view overlaid?


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