Index is always -1

[jamesholcomb]

import React, { Component } from 'react'
import { View, Text, StyleSheet, TouchableOpacity } from 'react-native'
import Ionicons from 'react-native-vector-icons/Ionicons'
import { ActionSheet, ActionSheetItem } from 'react-native-action-sheet-component'
import NavigationBar from 'react-native-navbar'

const checkedIcon = <Ionicons name="ios-checkmark-outline" size={30} />

export default class ActionSheetExample extends Component {
  constructor(props) {
    super(props)

    this.state = {
      selectedItems: [],
    }
  }

  onChange = (value, index, values) => {
    console.log('OnChange()', 'value:', value, 'index:', index, 'values:', values)
    this.setState({ selectedItems: values })
  }

  onItemPress = (value, index) => {
    console.log('OnItemPress()', 'value:', value, 'index:', index)
  }

  showActionSheet = () => {
    this.actionSheet.show()
  }

  render() {
    return (
      <View style={{ flex: 1, backgroundColor: '#DDDDDD' }}>
        <NavigationBar
          style={{ backgroundColor: '#ABC' }}
          title={{ title: 'Home' }}
          rightButton={{ title: 'Choose', handler: () => this.actionSheet.show() }}
        />
        <ActionSheet
          ref={(actionSheet) => { this.actionSheet = actionSheet }}
          position="bottom"
          onChange={this.onChange}
        >
          <ActionSheetItem
            text="Github"
            value="item1"
            index={0}
            selectedIcon={checkedIcon}
            onPress={this.onItemPress}
          />
          <ActionSheetItem
            text="Facebook"
            value="item2"
            index={1}
            selectedIcon={checkedIcon}
            onPress={this.onItemPress}
          />
        </ActionSheet>
      </View>
    )
  }
}

OnItemPress() value: item1 index: -1
OnChange() value: item1 index: -1 values: ["item1"]
OnItemPress() value: item2 index: -1
OnChange() value: item2 index: -1 values: ["item2"]

At first I thought index would be auto set by the ActionSheet, so then I tried specifying explicitly in props (see above).

Perhaps ActionSheet could set index automatically if not specified in props?