UIKit tvOS 14.0 Beta 2 to Beta 3 API Differences

NSAttributedString.h
Added NSTrackingAttributeName
UIAction.h
Added +[UIAction actionWithHandler:]
UIBackgroundConfiguration.h
UICellAccessory.h
UIListContentConfiguration.h
UIMenu.h
Added +[UIMenu menuWithChildren:]
UINavigationItem.h
Added UINavigationItemBackButtonDisplayMode
Added UINavigationItemBackButtonDisplayModeDefault
Added UINavigationItemBackButtonDisplayModeGeneric
Added UINavigationItemBackButtonDisplayModeMinimal