native-base/lib/module/utils/useKeyboardBottomInset.js

Essential cross-platform UI components for React Native

import * as React from 'react';
import { Keyboard, Platform } from 'react-native';
export const useKeyboardBottomInset = () => {
  const [bottom, setBottom] = React.useState(0);
  const subscriptions = React.useRef([]);
  React.useEffect(() => {
    function onKeyboardChange(e) {
      if (e.startCoordinates && e.endCoordinates.screenY < e.startCoordinates.screenY) setBottom(e.endCoordinates.height / 2);else setBottom(0);
    }

    if (Platform.OS === 'ios') {
      subscriptions.current = [Keyboard.addListener('keyboardWillChangeFrame', onKeyboardChange)];
    } else {
      subscriptions.current = [Keyboard.addListener('keyboardDidHide', onKeyboardChange), Keyboard.addListener('keyboardDidShow', onKeyboardChange)];
    }

    return () => {
      subscriptions.current.forEach(subscription => {
        subscription.remove();
      });
    };
  }, [setBottom, subscriptions]);
  return bottom;
};
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