调用任务后世博后台获取不起作用

Question

我正在尝试使用 expo 后台获取在 react-native 中实现后台任务。我创建了测试功能，它在按下按钮后运行后台任务并将“测试”打印到控制台。但是，当我调用此任务时，没有任何反应。有什么办法可以解决这个问题吗？

根据要求，我将此添加到我的 app.json 文件中

{
  "expo": {
    ...
    "ios": {
      ...
      "infoPlist": {
        ...
        "UIBackgroundModes": [
          "location",
          "fetch"
        ]
      }
    }
  }
}

示例代码：

import React, { useContext } from "react";
import { View, StyleSheet } from "react-native";
import { Text, Button } from "react-native-elements";
import { SafeAreaView } from "react-navigation";
import Spacer from "../components/Spacer";
import { Context as AuthContext } from "../context/AuthContext";
import { Context as TwoFactorContext } from "../context/TwoFactorContext";
import { FontAwesome } from "@expo/vector-icons";
import TwoFactorFalseForm from "../components/TwoFactorFalseForm";
import TwoFactorTrueForm from "../components/TwoFactorTrueForm";
import { NavigationEvents } from "react-navigation";
import { customStyle } from "../components/Styles";
import * as TaskManager from "expo-task-manager";
import * as BackgroundFetch from "expo-background-fetch";
const LOCATION_TASK_NAME = "background-location-task";

TaskManager.defineTask(LOCATION_TASK_NAME, () => {
  console.log("Test");
});

const AccountScreen = () => {
  const {
    state: { username },
    signout,
  } = useContext(AuthContext);
  const {
    state: { isEnabled },
    checkIsEnabled,
    reset,
  } = useContext(TwoFactorContext);

  return (
    <SafeAreaView style={customStyle.container} forceInset={{ top: "always" }}>
      <NavigationEvents onWillFocus={() => checkIsEnabled({ username })} />
      <Text style={customStyle.mainText}>Account</Text>
      <Text style={customStyle.passwordTextLabel}>Username</Text>
      <Text style={customStyle.passwordTextSmall}>{username}</Text>
      {isEnabled == true ? (
        <TwoFactorTrueForm />
      ) : isEnabled == false ? (
        <TwoFactorFalseForm />
      ) : (
        <Text>Error</Text>
      )}
      <Spacer>
        <Button
          title="Sign Out"
          onPress={signout}
          onPressIn={reset}
          buttonStyle={customStyle.button}
          titleStyle={customStyle.title}
        />
        <Button
          title="Register background task"
          onPress={async () => {
            await BackgroundFetch.registerTaskAsync(LOCATION_TASK_NAME, {
              minimumInterval: parseInt(60),
              stopOnTerminate: false,
              startOnBoot: true,
            });
          }}
        />
      </Spacer>
    </SafeAreaView>
  );
};

AccountScreen.navigationOptions = {
  title: "Account",
  tabBarIcon: <FontAwesome name="gear" size={20} />,
};

export default AccountScreen;