That might be the way they block it, but it must not be the only reason for customizing their UI. For movie playback there is a simple allowsAirplay property,

That might be the way they block it, but it must not be the only reason for customizing their UI. For movie playback there is a simple allowsAirplay property, and for mirroring they could draw an empty view (or whatever) across the 2nd screen.