使用 React Native 和 useEffect 获取

Question

Attempting to make a call to an API to get some data and store it in my components state. I am using useEffect with a [] dependency to fire only once. The setEntries line causes Expo to panic and crash on iOS. If I comment that out, I can log and see that the API is returning what I would expect. I am wondering if some kind of infinite loop is being kicked off by calling setEntries but I do not see that happening when I log to the console.

I have also tested adding isLoading , entries and isError to the dependency array to no avail.

Relevant code below:

import React, { useEffect, useState } from 'react';
import { SafeAreaView, ScrollView, Text } from 'react-native';
import { globalStyles } from '../../../styles';
import Card from '../../shared/components/card';
import { Entry } from '../../shared/models/Entry';
import { REQUEST } from '../../shared/services/networking';

export const EntryList = () => {
  const [entries, setEntries] = useState([]);
  const [isError, setIsError] = useState(false);
  const [isLoading, setIsLoading] = useState(true);

  useEffect(() => {
   fetch(url)
      .then((result) => {
        setIsLoading(false);
        if (result.ok) {
          return result.json();
        } else {
          throw new Error(result.status.toString());
        }
      })
      .then((entries) => {
        if (entries) {
          setEntries(entries.data.sort((a: Entry, b: Entry) => Date.parse(b.createdAt) - Date.parse(a.createdAt)));
        }
      })
      .catch((e) => {
        console.error(e);
        setIsError(e);
      });
  }, []);

  return (
    <SafeAreaView style={globalStyles.container}>
      <ScrollView showsVerticalScrollIndicator={false}>
        {isError && <Text>Sorry, we encountered an error.</Text>}
        {isLoading && <Text>Loading...</Text>}
        {entries && !isLoading ? (
          entries.map((entry, i) => <Card entry={entry} key={`entry-${i}`} />)
        ) : (
          <Text>No entries found. Tell us about your day :)</Text>
        )}
      </ScrollView>
    </SafeAreaView>
  );
};

EDIT: Some additional detail that is further complicating this issue. When I run this code on my MacBook, Expo works properly. When I run the same code on my Linux desktop (Elementary OS), I get the behavior described above. Because of this, I have opened an issue with Expo here: https://github.com/expo/expo/issues/11352

Answer 1

I think issue might be because you have same name entries in your state and request response in .then((entries) => {...}) . Try to change name in your response like response or something like

.then((response) => {
    if (response) {
       setEntries(response.data.sort((a: Entry, b: Entry) => Date.parse(b.createdAt) - Date.parse(a.createdAt)));
    }
})