准备用开发者手机写100个开源的demo不知道能不能实现，日拱一卒，期待蜕变。

第一个demo：日历，借鉴了网上的日历算法，自己用arkts写了界面和点击事件，各位可根据此demo写自己的日历选择器等组件。

1.目录结构：

2.主页代码

import common from '@ohos.app.ability.common'
import window from '@ohos.window'

import { DataManager } from '../tools/DataManager'

@Entry
@Component
struct Index {
  currentDate: Date = new Date()
  @State dataManager: DataManager = new DataManager(
    this.currentDate.getFullYear(),
    (this.currentDate.getMonth()+1),
    this.currentDate.getDate()
  )

  private context = getContext(this) as common.UIAbilityContext

  screenWidth: number = 480
  screenHeight: number = 853.33

  aboutToAppear() {
    // 获取屏幕的宽高
    window.getLastWindow(this.context)
      .then((windowClass: window.Window) => {
        let windowProperties = windowClass.getWindowProperties()
        this.screenWidth = px2vp(windowProperties.windowRect.width)
        this.screenHeight = px2vp(windowProperties.windowRect.height)
        this.dataManager.initData()
      })
      .catch((error: Error) => {
        console.error('Failed to obtain the window size. Cause: ' + JSON.stringify(error))
      })
  }

  build() {
    Column() {
      Column() {
        Row(){
          Row(){
            Image($r('app.media.arrow_left_double'))
              .height('60%')
              .margin({left:20})
              .onClick(() => {
                this.dataManager.currentYear = this.dataManager.currentYear - 1
                this.dataManager.initData();
              })
            Image($r('app.media.arrow_left'))
              .height('52%')
              .margin({left:10})
              .onClick(() => {
                if(this.dataManager.currentMonth > 1){
                  this.dataManager.currentMonth = this.dataManager.currentMonth - 1
                }else{
                  this.dataManager.currentYear = this.dataManager.currentYear - 1
                  this.dataManager.currentMonth = 12
                }
                this.dataManager.initData();
              })
          }
          .margin({top:8})
          .width('30%')
          .height(((this.screenWidth-5*8)/7))
          .backgroundColor(0xF7F7F7)

          Text(this.dataManager.currentDateStr)
            .height('100%')
            .fontSize(((this.screenWidth-5*8)/7)/3)
            .fontWeight(FontWeight.Bold)

          Row(){
            Image($r('app.media.arrow_right'))
              .height('52%')
              .margin({right:10})
              .onClick(() => {
                if(this.dataManager.currentMonth < 12){
                  this.dataManager.currentMonth = this.dataManager.currentMonth + 1
                }else{
                  this.dataManager.currentYear = this.dataManager.currentYear + 1
                  this.dataManager.currentMonth = 1
                }
                this.dataManager.initData();
              })
            Image($r('app.media.arrow_right_double'))
              .height('60%')
              .margin({right:20})
              .onClick(() => {
                this.dataManager.currentYear = this.dataManager.currentYear + 1;
                this.dataManager.initData();
              })
          }
          .margin({top:8})
          .width('30%')
          .height(((this.screenWidth-5*8)/7))
          .backgroundColor(0xF7F7F7)
          .justifyContent(FlexAlign.End)
        }
        .width('100%')
        .height(((this.screenWidth-5*8)/7))
        .backgroundColor(0xF7F7F7)
        .justifyContent(FlexAlign.SpaceBetween)

        Grid() {
          ForEach(this.dataManager.week, (day: any) => {
            GridItem() {
              Text(day.text)
                .fontSize(((this.screenWidth-5*8)/7)/3)
                .fontColor(day.fontColor)
                .backgroundColor(day.color)
                .width('100%')
                .height('100%')
                .textAlign(TextAlign.Center)
                .borderRadius(8)
            }
            .height("100%")
          }, day => day.id)
        }
        .columnsTemplate('1fr 1fr 1fr 1fr 1fr 1fr 1fr')
        .rowsTemplate('1fr')
        .backgroundColor(0xF7F7F7)
        .columnsGap(5)
        .rowsGap(5)
        .height(((this.screenWidth-5*8)/7))

        Grid() {
          ForEach(this.dataManager.days, (day: any) => {
            GridItem() {
              Column() {
                Text(day.text)
                  .fontSize(((this.screenWidth - 5 * 8) / 7) / 3)
                  .fontColor(day.fontColor)
                  .width('100%')
                  .height('42%')
                  .margin({top:8})
                  .textAlign(TextAlign.Center)
                Text(day.lunarText)
                  .fontSize(((this.screenWidth - 5 * 8) / 7) / 4)
                  .fontColor(day.lunarFontColor)
                  .width('100%')
                  .height('30%')
                  .textAlign(TextAlign.Center)
              }
              .borderRadius(day.borderRadius)
              .backgroundColor(day.color)
              .width('100%')
              .height(((this.screenWidth-5*8)/7))
            }
          }, day => day.id)
        }
        .columnsTemplate('1fr 1fr 1fr 1fr 1fr 1fr 1fr')
        .rowsTemplate(this.dataManager.rowsTemplate)
        .columnsGap(5)
        .rowsGap(5)
        .height(((this.screenWidth-5*8)/7)*this.dataManager.rowsTemplateNumber)
        .margin(5)
      }
      .width('100%')
      .height('100%')
      .backgroundColor('0xFFFFFF')
      .borderRadius(8)
    }
    .width('100%')
    .height('100%')
  }
}

3.显示效果

4.卡片显示（每晚00:01刷新）

5.源码地址

九流下半/openharmony_100_projects