鸿蒙HarmonyOS之使用ArkTs语言实现层级树状目录选择UI

一、实现效果

在这里插入图片描述

二、实现步骤

代码示例中用到的颜色、图片等资源可以自行替换设置

1、Index.ets 里面调用

import { CategoryView} from './CategoryView';//主页面
@Entry
@Component
struct Index {@State tabsIndex: number = 0;build() {...//层级目录ViewCategoryView()...}   
}

3、DirectoryItem.ets 目录数据存储对象

//目录Item
@Observed
export class DirectoryItem {id: string = ""; //idname: string = ""; //名称type: number;//类型：几级目录children: DirectoryItem[]; //子目录isExpand: boolean = false;constructor(id: string, name: string,type: number, children?: DirectoryItem[]) {this.id = id;this.name = name;this.type = type;this.children = children || [];}
}

3、DirectoryData.ets 目录示例数据

import { DirectoryItem } from '../bean/DirectoryItem';//目录数据
export const directoryStructure: DirectoryItem[] = [new DirectoryItem('1','默认目录1',1, [new DirectoryItem('2','1.1',2, [new DirectoryItem('3','1.1.1',3),new DirectoryItem('4','1.1.2',3, [new DirectoryItem('5','(1)',4), new DirectoryItem('6','(2)',4)]),new DirectoryItem('7','1.1.3',3)]),new DirectoryItem('8','1.2',2),new DirectoryItem('9','1.3',2, [new DirectoryItem('10','1.3.1',3), new DirectoryItem('11','1.3.2',3)])])];

4、CategoryView.ets 目录UI

import { DirectoryItem } from '../bean/DirectoryItem'
import { directoryStructure } from '../data/DirectoryData'//云传页
@Preview
@Component
export struct Tab_CloudUploadContent {build() {Column() {Row() {Text($r('目录')).fontSize(30).fontFamily('HarmonyHeiTi-Medium').fontColor($r('app.color.font_color_dark'))}.width('100%').height(80)//选择目录UIif (directoryStructure.length > 0){List() {ForEach(directoryStructure, (data: DirectoryItem, index: number) => {ListItem() {DirectoryComponent({ item: directoryStructure[index] })}})}.width('100%').height('100%').padding({ left: 10, right: 10 }).divider({ strokeWidth: 1, color: $r('app.color.background_shallow_grey') })}}.width('100%').height('100%').padding(10)}
}//目录组件
@Component
struct DirectoryComponent {@ObjectLink item: DirectoryItem; //当前目录Item对象@State selectId: string = ''; //选中目录Id@State isOpen: boolean = false; //记录目录是否展开状态build() {Column() {Row(){Row() {Text("|").fontSize(15).fontWeight(FontWeight.Bold).fontColor($r('app.color.tab_bar_select'))//目录名称Text(this.item.name).fontSize(15).fontWeight(FontWeight.Bold).margin({ left: 8 }).fontColor($r('app.color.font_color_dark'))}.layoutWeight(1).margin({ left: (this.item.type - 1) * 20 })//目录是否展开图标Image(this.isOpen ? $r('app.media.ic_select_live') : $r('app.media.ic_unselect_live')).width('20vp').height('20vp').objectFit(ImageFit.Contain)}.height(50).width('100%').onClick(() => {if (this.item.children != undefined) {//打开子目录 更新目录打开状态this.item.isExpand = !this.item.isExpand;this.isOpen = this.item.isExpand;} else {//记录选中目录Idthis.selectId = this.item.id;}})List() {ForEach(this.item.children, (children: DirectoryItem,index: number) => {ListItem() {if (children.children != undefined && children.children.length > 0) {//存在子目录，去循环生成层级目录DirectoryComponent({item: this.item.children[index]})} else {//没有子目录了，直接生成单个目录项this.renderDirectoryItem(children)}}}, (item: DirectoryItem) => item.name)}.visibility(this.isOpen ? Visibility.Visible : Visibility.None).width('100%').divider({ strokeWidth: 1, color: $r('app.color.background_shallow_grey') })}}@Builderprivate renderDirectoryItem(item: DirectoryItem) {Row() {Text(item.name).fontWeight(FontWeight.Bold).fontSize(15).fontColor($r('app.color.font_color_dark')).layoutWeight(1).margin({ left: (item.type - 1) * 20 + 11})}.width('100%').height('50vp').onClick(() => {//记录点击选中目录Idthis.selectId = item.id;})}
}