Javascript React native w/redux:分派不是一个函数

我试图在我的项目中实现以下示例：

但我一直遇到这样的错误：分派不是功能 从我的actions类执行分派函数时

似乎Dispatcher没有传递给我的操作，但我遵循了示例中的流程：

actions/index.js文件：

    export const REQUEST_LOCAL_POSTS = 'REQUEST_LOCAL_POSTS';
export const RECEIVE_LOCAL_POSTS = 'RECEIVE_LOCAL_POSTS';
export const REQUEST_CURRENT_LOCATION = 'REQUEST_CURRENT_LOCATION';
export const RECEIVE_CURRENT_LOCATION = 'RECEIVE_CURRENT_LOCATION';


export const requestCurrentLocation = () => ({
    type: REQUEST_CURRENT_LOCATION
})

export const receiveCurrentLocation = currentLocation => ({
    type: RECEIVE_CURRENT_LOCATION,
    currentLocation,
    receivedCurrentLocationAt: Date.now()
})

export const requestLocalPosts = () => ({
    type: REQUEST_LOCAL_POSTS
})

export const receiveLocalPosts = json => ({
    type: RECEIVE_LOCAL_POSTS,
    posts: json,
    receivedAt: Date.now() 
})

export const fetchLocalPosts = dispatch => {
    dispatch(requestCurrentLocation())
    navigator.geolocation.getCurrentPosition(
      (position) => {
         dispatch(requestLocalPosts()) // getting dispatch is not a function here
        return fetch(`http://192.168.1.3:9000/posts?lng=${position.coords.longitude}&lat=${position.coords.latitude}&radius=1000`)
    .then(response => response.json())
    .then(json => dispatch(receiveLocalPosts(json)))

      },
      (error) => this.setState({ error: error.message }),
      { enableHighAccuracy: true, timeout: 20000, maximumAge: 1000 },
    )

home.js（组件）：

---

fetchLocalPosts

应该返回一个以

dispatch

为参数的函数。将其更改为以下内容应该可以修复它

export const fetchLocalPosts = () => dispatch => {
  ...

这是另一种方法：

export const fetchLocalPosts = () => {
    return function (dispatch) {
      ...

---

谢谢，这真的帮了我的忙！没有意识到我应该返回一个函数。

export const fetchLocalPosts = () => dispatch => {
  ...

export const fetchLocalPosts = () => {
    return function (dispatch) {
      ...