title: How can you request photo gallery permissions in iOS a second time
body: <p>In my iOS app I am accessing the user's photo gallery.  The first time the user does this, it asks them for permission.  Some of my users have reported getting a crash this first time due to the permission request, but it works fine on subsequent tries.</p>
  
  <p>To be able to test this on my own, I need to be able remove the permission from my iPad and have it prompt again.  Is there a way to do this either through the iPad/iPhone itself or through code?</p>