The originally configured content view of the view controller before banner ads were enabled.
Apps that use banner views with a view controller should use this property to access the view controller’s content view.
When a view controller enables banner ads, the system puts the view controller’s content view inside of a new content view that the system manages. This allows the system to dynamically resize the original content view when a banner ad is displayed, as well as managing the display of the banner ad itself. This property provides access to the original content view, rather than the containing view that manages banner ad display.
If banner ad display has not been enabled for a view controller, this property returns the content view.
If banner ad display is enabled and then later disabled for a view controller, the system-managed content view is not removed.