react-native-keyboard-controller/src/hooks/useKeyboardState/index.ts

Keyboard manager which works in identical way on both iOS and Android

import { useEffect, useState } from "react";

import { KeyboardEvents } from "../../bindings";
import { KeyboardController } from "../../module";

import type { KeyboardState } from "../../types";

const EVENTS = ["keyboardDidShow", "keyboardDidHide"] as const;

const getLatestState = () => ({
  ...KeyboardController.state(),
  isVisible: KeyboardController.isVisible(),
});

export const useKeyboardState = (): KeyboardState => {
  const [state, setState] = useState(getLatestState);

  useEffect(() => {
    const subscriptions = EVENTS.map((event) =>
      KeyboardEvents.addListener(event, () =>
        // state will be updated by global listener first,
        // so we simply read it and don't derive data from the event
        setState(getLatestState),
      ),
    );

    // we might have missed an update between reading a value in render and
    // `addListener` in this handler, so we set it here. If there was
    // no change, React will filter out this update as a no-op.
    setState(getLatestState);

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

  return state;
};