显示键盘后滚动到FlatList的末尾

我在KeyboardAvoidingView内部有一个FlatList。显示键盘时，我想滚动到FlatList的末尾。

我正在侦听确实触发的'keyboardDidShow'事件，但是由于FlatList在调用scrollToEnd之后没有滚动到末尾，因此可能触发得太早了。

我已经研究了KeyboardAvoidingView的onLayout事件，但是仅在显示键盘时设置onLayout事件以触发功能似乎会阻止KeyboardAvoidingView调整其大小。

<KeyboardAvoidingView behavior='padding' style={{ flex: 1}} onLayout={this._scrollEnd}>

码：

import React from 'react';
import {Image, Linking, Platform, ScrollView, StyleSheet, Text, TouchableOpacity, View, Button, Alert, FlatList, TextInput, KeyboardAvoidingView, Keyboard} from 'react-native';
import { MonoText } from '../components/StyledText';

export default class HomeScreen extends React.Component {
  constructor() {
    super();
    this.state = {
      messages: getMessages()
    };

    this.keyboardDidShowListener = Keyboard.addListener('keyboardDidShow', this._scrollEnd);
    this.keyboardDidShowListener = Keyboard.addListener('keyboardDidHide', this._scrollEnd);
  }

  _scrollEnd = (evt) => {
    this.refs.flatList1.scrollToEnd();
  }

  render() {
    return (
      <KeyboardAvoidingView behavior='padding' style={{ flex: 1}} >
        <FlatList
          style={{ flex:1}}
          ref="flatList1"
          data={this.state.messages}
          renderItem={({ item }) => <Text>{item.text}</Text>}
        />
      </KeyboardAvoidingView>
    );
  }
}