native-base/lib/module/hooks/useScreenReaderEnabled.js

Essential cross-platform UI components for React Native

import React from 'react';
import { AccessibilityInfo } from 'react-native';
export function useScreenReaderEnabled() {
  const [enabled, setEnabled] = React.useState(false);
  const mountedRef = React.useRef(false);

  const handleSetEnabled = value => {
    if (mountedRef.current) {
      setEnabled(value);
    }
  };

  React.useEffect(() => {
    mountedRef.current = true;

    async function setInitialValue() {
      const res = await AccessibilityInfo.isScreenReaderEnabled();
      handleSetEnabled(res);
    }

    let handler = AccessibilityInfo.addEventListener('screenReaderChanged', event => {
      handleSetEnabled(event);
    });
    setInitialValue();
    return () => {
      mountedRef.current = false;
      AccessibilityInfo.removeEventListener('screenReaderChanged', handler);
    };
  });
  return enabled;
}
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