title: UIActivityViewController with integrated gallery (like in the stock Photos iPad app)
body: <p>If you launch the Photos app on iPad (iOS7) and tap the action button, you get a UIActivityViewController whose top half is made of a multi-select gallery, from within which you can select any number of items. The sharing options automatically adjust from your selection (for example "Twitter" and "Assign To Contact" disappear if you select more than one item).</p>
  
  <p>I have found nothing that appears to support this in the iOS7 SDK, so I wonder if this feature is unavailable to developers. Does anyone know how such a thing can be done?</p>