react-native-background-fetch使用疑难求助：minimumFetchInterval不生效、后台任务报错及iOS端无响应

我目前正在用react-native结合react-native-background-fetch开发一款应用，不过碰到了三个让人头疼的问题。我已经严格按照官方配置指南完成了Android和iOS两端的所有配置，但还是没解决这些问题。先贴一下我的代码，再逐个说明问题：

index.js 代码 #

import BackgroundFetch from 'react-native-background-fetch';

let MyHeadlessTask = async event => {
  // Get task id from event {}:
  let taskId = event.taskId;
  let isTimeout = event.timeout; // <-- true when your background-time has expired.

  if (isTimeout) {
    // This task has exceeded its allowed running-time.
    // You must stop what you're doing immediately finish(taskId)
    console.log('[BackgroundFetch] Headless TIMEOUT:', taskId);
    BackgroundFetch.finish(taskId);
    return;
  }

  console.log('[BackgroundFetch HeadlessTask] start: ', taskId);

  // Perform an example HTTP request.
  // Important:  await asychronous tasks when using HeadlessJS.
  const {saveLocation} = require('./App');
  const location = await saveLocation('auto');
  console.log('[BackgroundFetch HeadlessTask] location: ', location);

  // Required:  Signal to native code that your task is complete.
  // If you don't do this, your app could be terminated and/or assigned
  // battery-blame for consuming too much time in background.
  BackgroundFetch.finish(taskId);
};

// Register your BackgroundFetch HeadlessTask
BackgroundFetch.registerHeadlessTask(MyHeadlessTask);

App.js 相关代码 #

useEffect(() => {
  if (!dbUser) return;
  initBackgroundFetch();
}, [dbUser]);

const initBackgroundFetch = async () => {
  try {
    const onEvent = async taskId => {
      console.log('BackgroundFetch event triggered. Task ID:', taskId);
      console.log(new Date());
      await saveLocation('auto');
      BackgroundFetch.finish(taskId);
    };

    const onTimeout = async taskId => {
      console.warn(
        'BackgroundFetch TIMEOUT event triggered. Task ID:',
        taskId,
      );
      BackgroundFetch.finish(taskId);
    };

    let status = await BackgroundFetch.configure(
      {
        minimumFetchInterval: 30, // Minimum fetch interval in minutes
        stopOnTerminate: false,
        startOnBoot: true,
        enableHeadless: true,
      },
      onEvent,
      onTimeout,
    );
    console.log('BackgroundFetch configured successfully.');
  } catch (err) {
    console.error(err);
  }
};

接下来是我遇到的三个具体问题：

1. minimumFetchInterval设置完全不生效 #

不管我把这个参数设成1还是30分钟，后台任务的自动触发间隔都完全没有规律，和我设置的时间完全对不上——有时候隔很久才触发一次，有时候又会频繁触发，完全摸不清触发逻辑。

2. 应用完全关闭（非后台状态）时任务触发但报错 #

当我把应用彻底关闭（不是退到后台挂起）后，任务确实会自动运行，但每次都会抛出这个错误：

ERROR  [TypeError: saveLocation is not a function (it is undefined)]

我在Headless任务里是用require引入的App.js里的saveLocation方法，但为什么会提示方法未定义呢？

3. iOS端完全没有响应 #

Android端不管是后台状态还是完全关闭状态，至少还有任务触发的反应，但iOS端不管是把应用留在后台还是彻底关闭，background-fetch的任务都完全不触发，就像没配置过这个功能一样。

有没有大佬能针对这些问题给我详细的解答？真的非常感谢！

备注：内容来源于stack exchange，提问作者Koreahn