React Native:将数组长度设置为文件计数

import React, { useState } from 'react';
import { View, Text, Button } from 'react-native';
import DocumentPicker from 'react-native-document-picker';

const App = () => {
  const [files, setFiles] = useState([]);

  const pickFile = async () => {
    try {
      const res = await DocumentPicker.pickMultiple({
        type: [DocumentPicker.types.allFiles],
      });
      setFiles(res);
    } catch (err) {
      console.log(err);
    }
  };

  return (
    <View>
      <Button title="Pick File" onPress={pickFile} />
      <Text>File Count: {files.length}</Text>
    </View>
  );
};

export default App;