CardIOView.ios.js

import React, { Component } from 'react'
import PropTypes from 'prop-types'
import {
  requireNativeComponent,
  NativeAppEventEmitter
} from 'react-native'

class CardIOView extends Component {
  static propTypes = {
    didScanCard: PropTypes.func.isRequired,
    languageOrLocale: PropTypes.string,
    guideColor: PropTypes.string,
    useCardIOLogo: PropTypes.bool,
    hideCardIOLogo: PropTypes.bool,
    allowFreelyRotatingCardGuide: PropTypes.bool,
    scanInstructions: PropTypes.string,
    scanOverlayView: PropTypes.element,
    scanExpiry: PropTypes.bool,
    scannedImageDuration: PropTypes.number
  }

  componentWillMount() {
    const { didScanCard } = this.props
    this.listener = NativeAppEventEmitter.addListener(
      'didScanCard',
      didScanCard,
    )
  }

  componentWillUnmount() {
    if (this.listener) {
      this.listener.remove()
    }
  }

  render() {
    return <RCTCardIOView {...this.props} />
  }
}

const RCTCardIOView = requireNativeComponent('RCTCardIOView', CardIOView)

export default CardIOView