Reactnative NavigationActions.reset 不是函数吗

我创建了一个有Welcome个屏幕的项目，导航到MainActivity个屏幕.我希望当用户点击后退按钮时，它会在MainActivity而不是Welcome屏幕上关闭应用程序.我使用react-navigation库，所以我从Github中寻找一些解决方案.

当我使用https://github.com/react-navigation/react-navigation/issues/295的代码时.我得到了一个错误:

NavigationActions.reset is not a function

我安慰他.日志(log)(导航操作)；

显然没有重置.但是为什么其他人都能使用代码呢？

我搞不懂.任何帮助都将不胜感激.提前谢谢.

这是我的欢迎.js:

import React, { Component } from 'react';
import { View, Text, ActivityIndicator } from 'react-native';
import { NavigationActions } from 'react-navigation';
import { connect } from 'react-redux';
import { ColorSetting } from './common/ColorSetting';
import { fetchMainMovieList } from '../actions';

class Welcome extends Component {
  static navigationOptions = {
    header: null,
  };

  componentDidMount() {
    // call main page data first
    this.props.fetchMainMovieList();

    this.timer = setTimeout(() => { 
      this.navigateToMainActivity();
    }, 3000);
  }
  componentWillUnmount() {
    // if this.timer existed，then use clearTimeout to remove it.
    this.timer && clearTimeout(this.timer);
  }

  navigateToMainActivity() {
    console.log(NavigationActions);
    const resetAction = NavigationActions.reset({
      index: 1,
      actions: [
        NavigationActions.navigate({ routeName: 'MainActivity' })
      ]
    });

    this.props.navigation.dispatch(resetAction);
  }

  render() {
    return (
      <View>
        <Text>Three !</Text>
      </View>
    );
  }
}

export default connect(null, { fetchMainMovieList })(Welcome);