The size at which the visual portion of the item is presented by the player.
- iOS 4.0+
- macOS 10.7+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 6.0+
This property can be accessed at any time, but may return a value of
CGSize prior to the player item becoming ready to play. You can use key-value observing to obtain the player item’s valid presentation size as early as possible.