鸿蒙NEXT开发-知乎评论小案例（基于最新api12稳定版）

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1. 基本介绍

1.1 首页图

1.2 评论页图

2. 分解组件

2.1 新增导航栏组件

2.2 新增首页内容组件

2.3 新增评论组件

2.4 新增评论回复组件

3. 新增实体类

3.1 内容实体类

3.2 回复实体类

4. 新增页面

4.1 详情页

4.1.1 代码如下

4.2 首页页面

4.2.1 代码如下

5. 学习地址

1. 基本介绍

知乎评论小案例一共包含两个页面，分别是首页和评论页面，首页包含了知乎人家发的内容信息，从内容点击进去就可以访问到对应内容的评论，用户可以发送评论

1.1 首页图

首页展示app里面的所有内容，内容里面包含了用户的头像、内容封面、内容、日期、IP等信息

1.2 评论页图

评论页面里面包含了当前内容的评论回复，评论数量、点赞数，发布评论功能

2. 分解组件

2.1 新增导航栏组件

在编辑器里面新建一个文件目录叫components，然后新建NavBarComponent.ets文件

import { router } from '@kit.ArkUI'@Preview@Componentexport default struct NavBarComponent {title: string = "标题"build() {Row() {// 返回键Row() {Image($r('app.media.back')).width(16).height(16)}.width(30).height(30).borderRadius(15).backgroundColor("#f4f4f4").justifyContent(FlexAlign.Center).margin({left: 20}).onClick(() => {router.back()})Text(this.title).layoutWeight(1).textAlign(TextAlign.Center).margin({right: 50})}.width('100%').height(50).border({color: "#f4f5f6",width: {bottom: 1}})}}

2.2 新增首页内容组件

在components文件目录下面新建一个ContentComponent.ets文件

import ContentModel from '../model/ContentModel'@Preview@Componentexport default struct ContentComponent {@State item: ContentModel = new ContentModel(1,'https://p6-passport.byteacctimg.com/img/user-avatar/d7ad5f39e86149d511489a5cdec341d5~100x100.awebp','东林知识库','本库是个人学习的时候记录的笔记 对 Java 的一些基础知识、数据库知识、以及框架知识进行收集、整理（持续更新中）',$r('app.media.content'),'10-30','合肥')build() {Row({ space: 10 }) {Image(this.item.avatar).width(40).height(40).borderRadius(20)Column({ space: 10 }) {Text(this.item.author).fontColor("#303a43").fontSize(18).fontWeight(FontWeight.Bold)Text(this.item.content).fontColor("#2f3642").lineHeight(22)Row() {Text(`${this.item.time} .IP属地${this.item.area}`).fontColor("#cacaca").fontSize(12)Image(this.item.images).width(80).height(60)}.justifyContent(FlexAlign.SpaceBetween).width('100%')}.alignItems(HorizontalAlign.Start).layoutWeight(1)}.alignItems(VerticalAlign.Top).padding(20).width('100%')}}

2.3 新增评论组件

在components文件目录下面新建CommentItemComponent.ets文件

import ReplyItemModel from '../model/ReplyItemModel'@Preview@Componentexport default struct CommentItemComponent {@State item: ReplyItemModel = new ReplyItemModel(1,'https://picx.zhimg.com/027729d02bdf060e24973c3726fea9da_l.jpg?source=06d4cd63','小花','谁能爱我一次哈哈','11-30','海南',34,false)build() {Row({ space: 10 }) {Image(this.item.avatar).width(40).height(40).borderRadius(20)Column({ space: 10 }) {Text(this.item.author).fontColor("#303a43").fontSize(18).fontWeight(FontWeight.Bold)Text(this.item.content).fontColor("#2f3642").lineHeight(22)Row() {Text(`${this.item.time} .IP属地${this.item.area}`).fontColor("#cacaca").fontSize(12)Row({ space: 4 }) {Image($r("app.media.like")).width(40).height(30).fillColor("#cacaca")Text(this.item.likeNum.toString()).fontColor("#cacaca").fontSize(12)}}.justifyContent(FlexAlign.SpaceBetween).width('100%')}.alignItems(HorizontalAlign.Start).layoutWeight(1)}.alignItems(VerticalAlign.Top).padding(20).width('100%')}}

2.4 新增评论回复组件

在components文件目录下面新建ReplyInputComponent.ets文件

import ReplyItemModel from '../model/ReplyItemModel'@Componentexport default struct ReplyInputComponent {@Link contentList: ReplyItemModel[]@State content: string = ''build() {Row({ space: 10 }) {TextInput({ text: $$this.content, placeholder: '～请留下您的神评论' }).layoutWeight(1).height(40)Button("发布").onClick(() => {if (this.content) {this.contentList.push(new ReplyItemModel(Math.random(),'https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fsafe-img.xhscdn.com%2Fbw1%2F1bad8264-7428-44cf-a92d-3016a2de537b%3FimageView2%2F2%2Fw%2F1080%2Fformat%2Fjpg&refer=http%3A%2F%2Fsafe-img.xhscdn.com&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=auto?sec=1711626934&t=5478cb3adef5d3e29e6952934797ca39','东林',this.content,'10-30','山东',31,false))this.content = ""}})}.padding({ left: 10, right: 10 }).width('100%').height(60)}}

3. 新增实体类

3.1 内容实体类

在编辑器里面新建一个model文件目录，在这个文件目录下面新建ContentModel.ets文件

export default class ContentModel {id: number = 0avatar: string = ''author: string = ''content: string = ''images: string | Resource = ''time: string = ''area: string = ''constructor(id: number, avatar: string, author: string, content: string, images: string | Resource, time: string,area: string) {this.id = idthis.avatar = avatarthis.author = authorthis.content = contentthis.time = timethis.area = areathis.images = images}
}

3.2 回复实体类

在model文件目录下面新建ReplyItemModel.ets文件

export default class ReplyItemModel {id: number = 0avatar: string = ''author: string = ''content: string = ''time: string = ''area: string = ''likeNum: number = 0likeFlag: boolean = falseconstructor(id: number, avatar: string, author: string, content: string, time: string, area: string, likeNum: number,likeFlag: boolean) {this.id = idthis.avatar = avatarthis.author = authorthis.content = contentthis.time = timethis.area = areathis.likeNum = likeNumthis.likeFlag = likeFlag}
}

4. 新增页面

4.1 详情页

在文件目录pages下面新建Detail.ets的页面，代码如下展示

4.1.1 代码如下

import NavBarComponent from '../components/NavBarComponent'
import CommentItemComponent from '../components/CommentItemComponent'
import ReplyItemModel from '../model/ReplyItemModel'
import ReplyInputComponent from '../components/ReplyInputComponent'@Entry@Componentstruct Detail {@State commentList: ReplyItemModel[] = [new ReplyItemModel(1,'https://picx.zhimg.com/027729d02bdf060e24973c3726fea9da_l.jpg?source=06d4cd63','小花','谁能爱我一次哈哈','11-30','海南',34,false),new ReplyItemModel(2,'https://pic1.zhimg.com/v2-5a3f5190369ae59c12bee33abfe0c5cc_xl.jpg?source=32738c0c','东林','东林大王来了','11-30','北京',100,true),new ReplyItemModel(3,'https://pic1.zhimg.com/v2-5a3f5190369ae59c12bee33abfe0c5cc_xl.jpg?source=32738c0c','小妹','今天吃香蕉','11-30','北京',100,true),new ReplyItemModel(4,'https://pic1.zhimg.com/v2-5a3f5190369ae59c12bee33abfe0c5cc_xl.jpg?source=32738c0c','大王','我要好好学习报效国家','11-30','北京',100,true),]build() {Column() {NavBarComponent({ title: '评论回复' })Divider().strokeWidth(6)Row() {Text("评论数50")}.width('100%').height(50).padding({left: 20}).border({color: '#f3f4f5',width: {bottom: 1}})List() {ForEach(this.commentList, (item: ReplyItemModel) => {ListItem() {CommentItemComponent({ item })}}, (item: ReplyItemModel) => item.id.toString())}.layoutWeight(1)ReplyInputComponent({ contentList: this.commentList })}}}

4.2 首页页面

在文件目录pages下面修改Index.ets页面，代码如下

4.2.1 代码如下

import ContentComponent from '../components/ContentComponent'
import ContentModel from '../model/ContentModel'
import { router } from '@kit.ArkUI'@Entry@Componentstruct Index {@State content: ContentModel = new ContentModel(1,'https://p6-passport.byteacctimg.com/img/user-avatar/d7ad5f39e86149d511489a5cdec341d5~100x100.awebp','东林知识库','本库是个人学习的时候记录的笔记 对 Java 的一些基础知识、数据库知识、以及框架知识进行收集、整理（持续更新中）','https://p6-passport.byteacctimg.com/img/user-avatar/d7ad5f39e86149d511489a5cdec341d5~100x100.awebp','10-30','合肥',)build() {Column() {Text('我是知乎首页')List() {ForEach([1, 2, 3, 4, 5, 6, 7], () => {ListItem() {ContentComponent({ item: this.content }).onClick(() => {router.pushUrl({url: 'pages/Detail'})})}})}}.justifyContent(FlexAlign.Start).width('100%').height('100%')}}