useScrollOffset

useScrollOffset lets you to create animations based on the offset of a scrollable component (e.g. ScrollView, FlatList, FlashList). The hook automatically detects if the scrollable is horizontal or vertical.

Reference

import { useScrollOffset } from 'react-native-reanimated';

function App() {
  const animatedRef = useAnimatedRef<ScrollView>();
  const scrollOffset = useScrollOffset(animatedRef);
  return <ScrollView ref={animatedRef}>{/* ... */}</ScrollView>;
}

Type definitions

function useScrollOffset<C extends ScrollableComponent>(
  animatedRef: AnimatedRef<C> | null,
  providedOffset?: SharedValue<number>
): SharedValue<number>;

type ScrollableComponent = Component<
  Pick<
    ScrollViewProps,
    | 'onScroll'
    | 'onScrollBeginDrag'
    | 'onScrollEndDrag'
    | 'onMomentumScrollBegin'
    | 'onMomentumScrollEnd'
  >
> &
  Pick<ScrollView, 'getScrollableNode'>;

Arguments

animatedRef

An animated ref connected to the scrollable component you'd want to scroll on. The animated ref has to be passed either to an Animated component or a React Native built-in component.

providedOffset

Optional

An optional shared value to be updated with the scroll offset. If not provided a new shared value, created internally, will be updated and returned.

Returns

useScrollOffset returns a shared value which holds the current offset of the scrollable component.

Example

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Remarks

• The animatedRef argument can be changed at will and the hook will correctly return values based on the scrollable component it is connected to, for example:

  useScrollOffset(someState ? someScrollRefA : someScrollRefB)

Platform compatibility

Android	iOS	Web
✅	✅	✅