title: iOS8 check if device has Touch ID
body: <p>LAContext has method to check if device can evaluate touch ID and gives error message.
  Problem is that same error message "LAErrorPasscodeNotSet" is given by system in two cases:</p>
  
  <p>1) If user has Touch ID, but turned it off in settings (iPhone 5s with iOS8)</p>
  
  <p>2) If device doesn't have Touch ID (iPad with iOS8)</p>
  
  <p>Q: How to check if device supports Touch ID, but haven't turned it on in settings?</p>
  
  <p><strong>Update:</strong></p>
  
  <p>Had created ticket to Apple regarding this bug (ID# 18364575) and received answer:</p>
  
  <p>"<em>Engineering has determined that this issue behaves as intended based on the following information:</em></p>
  
  <p><em>If passcode is not set, you will not be able to detect Touch ID presence. Once the passcode is set, canEvaluatePolicy will eventually return LAErrorTouchIDNotAvailable or LAErrorTouchIdNotEnrolled and you will be able to detect Touch ID presence/state.</em> </p>
  
  <p><em>If users have disabled passcode on phone with Touch ID, they knew that they will not be able to use Touch ID, so the apps don't need to detect Touch ID presence or promote Touch ID based features. "</em></p>