- Display the camera from within your app (might be a scanner for instance)
- Click the "Home" button on the phone to suspend the app.
- When the app is active use the code to display the lock screen.
- The camera has top most (modal) behavior and will not show the lock screen.
Note that you can do a DismissViewController when the app suspends, but I was looking for a more elegant solution that will leave the camera up.