当我使用 while 循环时，我的 react-native-app 冻结了

Question

此组件向患者显示日历，以便他们可以 select 从医生的预约日开始预约。医生预约日期是从 api 中获取的。我想要实现的是禁用日历中除医生预约日之外的所有其他工作日，以便患者只能按其中一个预约日。我正在使用 react-native-calendars 库和 date-fns-library 作为日期。但是，我的应用程序在定义循环时冻结一次。我在这里做错了什么？还有没有更好的方法来实现我想要实现的目标？

import { View } from "react-native";
import React, { useEffect, useState } from "react";
import { Calendar, CalendarProps } from "react-native-calendars";
import startOfMonth from "date-fns/startOfMonth";
import endOfMonth from "date-fns/endOfMonth";
import isBefore from "date-fns/isBefore";
import addDays from "date-fns/addDays";
import format from "date-fns/format";
import setDay from "date-fns/setDay";
import api from "../../config/api";
import Layout from "../UI/Layout";
import RegularText from "../UI/Text/RegularText";
import { useAppSelector } from "../../store/hooks";
import { useRoute } from "@react-navigation/native";
import { AppointmentDaysScreenRouteProp } from "../../@types/navigation";

const weekdays = ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"] as const;

type weekday = typeof weekdays[number];

const CalendarComponent = () => {
  const language = useAppSelector((state) => state.language.selected);
  const [markedDates, setMarkedDates] = useState<CalendarProps["markedDates"]>(
    {}
  );
  const [disabledledWeekdays, setDisbaledWeekdays] = useState<number[]>([]);
  const route = useRoute<AppointmentDaysScreenRouteProp>();

  const { doctorId } = route.params;

  const [loading, setLoading] = useState(true);

  let text = {
    loading: "...Please wait",
  };

  if (language === "اردو") {
    text = {
      loading: "...لوڈ ہو رہا ہے",
    };
  }

  useEffect(() => {
    (async () => {
      try {
        const res = await api.get<{ appointmentDays: weekday[] }>(
          `/appointments/appointmentDays/doctorId/${doctorId}`
        );

        const { appointmentDays } = res.data;
        const disabledDays = weekdays
          .filter((item) => !appointmentDays.includes(item))
          .map((item) => weekdays.indexOf(item));

        const now = new Date();

        getDisabledDays(now.getMonth(), now.getFullYear(), disabledDays);

        setDisbaledWeekdays(disabledDays);
      } finally {
        setLoading(false);
      }
    })();
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, []);

  const getDisabledDays = (
    month: number,
    year: number,
    daysIndexes: number[]
  ) => {
    const now = new Date();

    now.setFullYear(year, month);

    const pivot = startOfMonth(now);
    const end = endOfMonth(now);
    const dates: CalendarProps["markedDates"] = {};

    const disabled = { disabled: true, disableTouchEvent: true };
    //THIS WHILE LOOP IS FREEZING MY APP
    //IF I REMOVE THIS LOOP APP WORKS FINE
    while (isBefore(pivot, end)) {
      daysIndexes.forEach((day) => {
        const copy = setDay(new Date(pivot), day);
        dates[format(copy, "yyyy-MM-dd")] = disabled;
      });
      addDays(pivot, 7);
    }
    setMarkedDates(dates);
    return dates;
  };

  return (
    <Layout>
      <View>
        {loading ? (
          <RegularText>{text.loading}</RegularText>
        ) : (
          <Calendar
            theme={{
              textSectionTitleDisabledColor: "#d9e1e8",
            }}
            markedDates={markedDates}
            onDayPress={(day) => {
              console.log("dosomething with ", day);
            }}
            firstDay={1}
            enableSwipeMonths={true}
            disabledDaysIndexes={disabledledWeekdays}
             onMonthChange={(date) => {
               getDisabledDays(date.month - 1, date.year, disabledledWeekdays);
             }}
          />
        )}
      </View>
    </Layout>
  );
};

export default CalendarComponent;

Answer 1

查看 documentation，我似乎 addDays(date, amount) 正在返回一个新日期并且没有修改 pivot 的值。尝试做 pivot = addDays(pivot, 7)

当我使用 while 循环时，我的 react-native-app 冻结了

My react-native-app freezes when i use while loop

javascript

while-loop

react-native

date-fns

react-native-calendars