ScrollController not attached to any scroll views

Question

I\'m using CustomScrollView, and providing it with a controller. ScrollController works, I even added a listener to it and print out the position of the scroll view.

Answer 1

I used this code to make the color of the appbar transparent at 0 position and black for more than 70

backgroundColor: !_scrollController.hasClients
            ? Colors.transparent
            : _scrollController.offset > 70
                ? Color.fromRGBO(7, 7, 7, 1)
                : Colors.transparent,