A Boolean value indicating whether the view optimizes live-resize operations by preserving content that has not moved.
- macOS 10.4+
The default value of this property is
false. If your view supports content preservation, override this property and return
true. Content preservation lets your view decide what to redraw during a live resize operation. If your view supports this feature, you should also provide a custom implementation of the
set method that invalidates the portions of your view that actually need to be redrawn.
For information on how to implement this feature in your views, see Cocoa Performance Guidelines.