LoadingSpinner.js

/**
 * @providesModule LoadingSpinner
 */
import React, { ActivityIndicatorIOS, Platform, ProgressBarAndroid, StyleSheet } from 'react-native'

const IS_ANDROID = Platform.OS === 'android'

export default ({ ...props }) => IS_ANDROID
  ? <ProgressBarAndroid style={styles.spinner} {...props} />
  : <ActivityIndicatorIOS style={styles.spinner} {...props} />

const styles = StyleSheet.create({
  spinner: {
    flex: 1,
    alignSelf: 'center',
    alignItems: 'center',
    justifyContent: 'center'
  }
})