A Boolean value that indicates whether content appears on the back of pages.
- iOS 5.0+
- Mac Catalyst 13.0+
- tvOS 9.0+
The default value for this property is
If the back of pages has no content (the value is
NO), then the content on the front of the page will partially show through to the back when turning pages.
If the spine is located in the middle, the value must be
YES. Setting it to
NO with the spine located in the middle raises an exception.