Detect vertical swipe direction in Flutter

Question

How to detect when the user swipe vertically either upward on downward?

I have been using swipedetector package, but now, it gives me exceptions like

Answer 1

I ran into the same problem today, try running flutter clean, and hot restart your app. If this doesn't help one can always use Gesture Detector as M.Ali answered. In my case a simple hot restart fixed the problem.