title: How to determine if a camera flash is available on an iOS device
body: <p>Overall my app works on all iOS device however I have a feature that only works on iPhone 4's therefore if the user does not have an iPhone 4 I'd like to display an alert letting them know that this feature won't work on their device?</p>
  
  <p>How can I do that?</p>
  
  <p>I'm trying to check if the device has the camera-flash</p>