그다음에는 CalendarScreen에서 현재 선택된 날짜로 로그를 필터링해 FeedList에 전달하고 ListHeaderComponent에는 CalendarView를 설정하세요.

screens/CalendarScreen.js

import {format} from 'date-fns';
import React, {useContext, useState} from 'react';
import CalendarView from '../components/CalendarView';
import FeedList from '../components/FeedList';
import LogContext from '../contexts/LogContext';

function CalendarScreen() {
  (...)

  const filteredLogs = logs.filter(
    (log) => format(new Date(log.date), 'yyyy-MM-dd') === selectedDate,
  );
  return (
    <FeedList
      logs={filteredLogs}
      ListHeaderComponent={
        <CalendarView
          markedDates={markedDates}
          selectedDate={selectedDate}
          onSelectDate={setSelectedDate}
        />
      }
    />
  );
}

export default CalendarScreen;