According to the docs you should be able to interrogate the currentTopViewPosition property.
This is defined as
typedef NS_ENUM(NSInteger, ECSlidingViewControllerTopViewPosition) {
/** The top view is on anchored to the left */
ECSlidingViewControllerTopViewPositionAnchoredLeft,
/** The top view is on anchored to the right */
ECSlidingViewControllerTopViewPositionAnchoredRight,
/** The top view is centered */
ECSlidingViewControllerTopViewPositionCentered
};
It looks like you can access the instance of ECSlidingViewController
that contains your view controller using the UIViewController(ECSlidingViewController)category method
slidingViewController`