RN使用FlatList实现上拉加载更多的代码

import React, { useState, useEffect } from 'react';
import { FlatList, View, Text, ActivityIndicator, StyleSheet } from 'react-native';

const MyComponent = () => {
  const [data, setData] = useState([]);
  const [loading, setLoading] = useState(false);
  const [page, setPage] = useState(1);

  const fetchData = () => {
    setLoading(true);
    // 模拟从API获取数据
    setTimeout(() => {
      const newData = Array.from({ length: 10 }, (_, index) => ({ id: index + 1, text: `Item ${index + 1}` }));
      setData([...data, ...newData]);
      setLoading(false);
    }, 1000);
  };

  const handleLoadMore = () => {
    if (!loading) {
      setPage(page + 1);
      fetchData();
    }
  };

  useEffect(() => {
    fetchData();
  }, []);

  const renderFooter = () => {
    return loading ? (
      <View style={styles.footer}>
        <ActivityIndicator size="large" color="blue" />
      </View>
    ) : null;
  };

  return (
    <FlatList
      data={data}
      renderItem={({ item }) => (
        <View style={styles.item}>
          <Text>{item.text}</Text>
        </View>
      )}
      keyExtractor={(item) => item.id.toString()}
      onEndReached={handleLoadMore}
      onEndReachedThreshold={0.1}
      ListFooterComponent={renderFooter}
    />
  );
};

const styles = StyleSheet.create({
  item: {
    padding: 20,
    borderBottomWidth: 1,
    borderBottomColor: '#ccc',
  },
  footer: {
    alignItems: 'center',
    justifyContent: 'center',
    paddingVertical: 20,
  },
});

export default MyComponent;