HarmonyOS NEXT星河版之实战知乎App评论功能

本文主要是介绍HarmonyOS NEXT星河版之实战知乎App评论功能，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

一、目标完成页面

二、实战

2.1 定义数据

export interface ReplyItem {avatar: ResourceStr // 头像author: string // 作者id: number // 评论的idcontent: string // 评论内容time: string // 发表时间area: string // 地区likeNum: number // 点赞数量likeFlag: boolean | null // 当前用户是否点过赞
}export class ReplyItemModel implements ReplyItem {id: number = 0avatar: string | Resource = ''author: string = ''content: string = ''time: string = ''area: string = ''likeNum: number = 0likeFlag: boolean | null = nullconstructor(model: ReplyItem) {this.id = model.idthis.avatar = model.avatarthis.author = model.authorthis.content = model.contentthis.time = model.timethis.area = model.areathis.likeNum = model.likeNumthis.likeFlag = model.likeFlag}
}
export enum CommentType {MAIN,// 顶部NORMAL// 普通
}

2.2 mock数据

export const mockReplyList: ReplyItemModel[] = [new ReplyItemModel({id: 1,avatar: 'https://picx.zhimg.com/027729d02bdf060e24973c3726fea9da_l.jpg?source=06d4cd63',author: '偏执狂-妄想家',content: '更何况还分到一个摩洛哥[惊喜]',time: '11-30',area: '海南',likeNum: 34,likeFlag: false}),new ReplyItemModel({id: 2,avatar: 'https://pic1.zhimg.com/v2-5a3f5190369ae59c12bee33abfe0c5cc_xl.jpg?source=32738c0c',author: 'William',content: '当年希腊可是把1：0发挥到极致了',time: '11-29',area: '北京',likeNum: 58,likeFlag: false}),new ReplyItemModel({id: 3,avatar: 'https://picx.zhimg.com/v2-e6f4605c16e4378572a96dad7eaaf2b0_l.jpg?source=06d4cd63',author: 'Andy Garcia',content: '欧洲杯其实16队球队打正赛已经差不多，24队打正赛意味着正赛阶段在小组赛一样有弱队。',time: '11-28',area: '上海',likeNum: 10,likeFlag: false}),new ReplyItemModel({id: 4,avatar: 'https://picx.zhimg.com/v2-53e7cf84228e26f419d924c2bf8d5d70_l.jpg?source=06d4cd63',author: '正宗好鱼头',content: '确实眼红啊，亚洲就没这种球队，让中国队刷',time: '11-27',area: '香港',likeNum: 139,likeFlag: false}),new ReplyItemModel({id: 5,avatar: 'https://pic1.zhimg.com/v2-eeddfaae049df2a407ff37540894c8ce_l.jpg?source=06d4cd63',author: '柱子哥',content: '我是支持扩大的，亚洲杯欧洲杯扩到32队，世界杯扩到64队才是好的，世界上有超过200支队伍，欧洲区55支队伍，亚洲区47支队伍，即使如此也就六成出现率',time: '11-27',area: '旧金山',likeNum: 29,likeFlag: false}),new ReplyItemModel({id: 6,avatar: 'https://picx.zhimg.com/v2-fab3da929232ae911e92bf8137d11f3a_l.jpg?source=06d4cd63',author: '飞轩逸',content: '禁止欧洲杯扩军之前，应该先禁止世界杯扩军，或者至少把亚洲名额一半给欧洲。',time: '11-26',area: '里约',likeNum: 100,likeFlag: false})
]

2.3 封装顶部标题栏

代码：

@Component
struct ZhiHuNavBar {title: string = '标题'build() {Stack({ alignContent: Alignment.Start }) {Row() {Image($r('app.media.ic_left_arrow')).width(14).margin({ left: 3 })}.height(30).width(30).borderRadius(15).justifyContent(FlexAlign.Center).zIndex(999).backgroundColor(Color.Gray)Text(this.title).width('100%').textAlign(TextAlign.Center)}.width('100%').height(50).padding({ left: 20, right: 20 }).backgroundColor(Color.White).border({color: '#e5e5e5',width: {bottom: 1}})}
}export { ZhiHuNavBar }

2.4 封装评论Item

代码：

import { ReplyItem, ReplyItemModel } from '../models'@Preview
@Component
struct ZhiHuComponentItem {@Prop item: ReplyItemModel = new ReplyItemModel({} as ReplyItem)changeLike: () => void = () => {}build() {Row({ space: 10 }) {Image(this.item.avatar).width(28).borderRadius(14)Column() {Text(this.item.author).fontSize(16).fontWeight(FontWeight.Bold)Text(this.item.content).fontSize(13).maxLines(3).lineHeight(18).textOverflow({ overflow: TextOverflow.Ellipsis }).margin({ top: 8 }).padding({ bottom: 12 })Row({ space: 5 }) {Text(`${this.item.time} IP归属地${this.item.area}`).fontSize(12).fontColor('#999999')Row({ space: 3 }) {Image($r('app.media.ic_like')).width(12).fillColor(this.item.likeFlag ? Color.Red : Color.Black)Text(this.item.likeNum.toString()).fontSize(12).fontColor('#999999')}.onClick(() => {this.changeLike()})}.width('100%').justifyContent(FlexAlign.SpaceBetween)}.layoutWeight(1).alignItems(HorizontalAlign.Start)}.width('100%').alignItems(VerticalAlign.Top).padding(20)}
}export { ZhiHuComponentItem }

2.5 定义回复组件

代码：

@Component
struct ZhiHuReply {@State content: string = ''onSubmitContent: (content: string) => void = () => {}submitContent() {if (this.content) {this.onSubmitContent(this.content)this.content = ''}}build() {Row({ space: 15 }) {TextInput({ placeholder: '请输入', text: $$this.content }).layoutWeight(1).height(40).onSubmit(() => {this.submitContent()})Button('发布').onClick(() => {this.submitContent()})}.height(60).width('100%').padding({left: 20,right: 20}).border({color: '#e5e5e5',width: {top: 1}})}
}export { ZhiHuReply }

2.6 主页面

import { ZhiHuComponentItem, ZhiHuNavBar, ZhiHuReply } from './components'
import { mockReplyList, ReplyItemModel, ReplyItem, CommentType } from './models'@Entry
@Component
struct ZhiHuDemoPage {@State commentList: ReplyItem[] = mockReplyList@State mainComment: ReplyItemModel = new ReplyItemModel({id: 999,author: '周杰伦',avatar: $r("app.media.zfb_pro_pic3"),likeNum: 10,likeFlag: false,time: '03-02',area: '北京',content: '人到了一定的年龄新陈代谢就慢了，吃了胖不吃瘦了皱纹就多，要靠锻炼 '})private scroller: Scroller = new Scroller()/*** 点赞or取消点赞* @param item* @param type*/doChangeLike(item: ReplyItemModel, type?: CommentType) {if (item.likeFlag) {item.likeNum--} else {item.likeNum++}item.likeFlag = !item.likeFlagif (type === CommentType.MAIN) {this.mainComment = item} else {const index = this.commentList.findIndex(obj => obj.id === item.id)// this.commentList[index] = new ReplyItemModel(item)this.commentList.splice(index, 1, item)}}/*** 提交评论* @param content*/onSubmitContent(content: string) {const replyItem = new ReplyItemModel({id: Math.random(),author: '李佳琦',avatar: $r("app.media.zfb_pro_pic3"),likeNum: 0,likeFlag: false,time: `${(new Date().getMonth() + 1).toString().padStart(2, '0')}-${new Date().getDate()}`,area: '上海',content})this.commentList.unshift(replyItem)this.scroller.scrollEdge(Edge.Top)}build() {Column() {// 标题栏ZhiHuNavBar({ title: '评论' })// 主评论ZhiHuComponentItem({item: this.mainComment,changeLike: () => {this.doChangeLike(this.mainComment, CommentType.MAIN)}})// 分割线Divider().strokeWidth(6)// 评论数Row() {Text(`评论数${this.commentList.length}`)}.width('100%').height(50).padding({ left: 20 }).border({color: '#f3f4f5',width: {bottom: 1}})// 普通评论列表List({ scroller: this.scroller }) {ForEach(this.commentList, (item: ReplyItemModel) => {ListItem() {ZhiHuComponentItem({item,changeLike: () => {this.doChangeLike(item)}})}})}.layoutWeight(1)// 回复模块ZhiHuReply({onSubmitContent: (content: string) => {this.onSubmitContent(content)}})}.height('100%').width('100%').backgroundColor(Color.White)}
}

三、小结

• 组件拆分及布局
• 父子组件数据传递
• 父子组件事件传递
• 数据更新及回调

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