调用嵌套函数

Question

我正在尝试在React Native的列表中做一个搜索栏。 我有一个功能组件，里面有另一个函数_searchFilter，用于过滤要显示在清单上的数据，但是我的SearchBar组件位于我的navigationOptions中的stacknavigator头上，例如

function VoltAQUI (props) {
  const { markers, fetchMarkers } = props

  const [data, setData] = useState({})
  const [loading, setLoading] = useState(false)

  useEffect(() => {
    fetchMarkers({
      location: 'Av.+Paulista,+171',
      distance: 1
    })
    console.log('fetching')
  }, [])

  useEffect(() => {
    if (markers.length === 0) {
      setLoading(true)
    } else {
      setData(markers)
      setLoading(false)
      console.log('fetched')
    }
  }, [markers.length])

  this._searchFilter = text => {
    const newData = markers.filter(item => {
      const itemData = `${item.name.title.toUpperCase()}`
      const textData = text.toUpperCase()
      return itemData.indexOf(textData) > -1
    })
    setData(newData)
  }

  return (
    <Container>
      <ListContainer>
        {loading ? (
          <ActivityIndicator size='large' />
        ) : (
          <FlatList
            data={data}
            renderItem={({ item }) => (
              <ListMapItem
                handleClick={() => { console.log() }}
                title={item.name}
                address={item.address}
                cashback={item.cashback}
              />
            )}
            keyExtractor={(item, index) => index.toString()}
          />
        )}
      </ListContainer>
    </Container>
  )
}

VoltAQUI.navigationOptions = () => ({
  headerRight:
  <SearchBarHeader
    placeholder='Exemplo: Avenida Paulista 171'
    onChangeText={text => VoltAQUI()._searchFilter(text)}
  />
})

VoltAQUI.propTypes = {
  markers: PropTypes.array,
  fetchMarkers: PropTypes.func
}

VoltAQUI.defaultProps = {
  markers: []
}

const mapStateToProps = state => ({
  markers: state.voltaQui.markers
})
const mapDispatchToProps = { fetchMarkers }

const addReduxProps = connect(mapStateToProps, mapDispatchToProps)

export default addReduxProps(VoltAQUI)

这将返回我，并且错误：props is undefined。 如何在_searchFilter的{​​{1}}道具上调用onChangeText函数？