HarmonyOS鸿蒙Next中Sidebar侧边栏使用问题

开发者您好，提供如下demo供参考：

【解决方案】

1、实现Navigation+侧边栏，且分栏效果需要跟随屏幕大小而变化，可以参考示例代码基于一多能力实现响应式布局中的“三分栏”效果； 2、结合Tabs组件，且小屏TabBar在下方，大屏TabBar在左侧；Tabs只有第一个页签需要展示侧边栏，可以修改示例代码中的TripleColumnView文件，修改后如下所示（仅在外层添加Tabs、TabContent组件和vertical属性）：

import { WidthBreakpointType } from '../utils/WidthBreakpointType';
import { WindowInfo } from '../utils/WindowUtil';
import { NavigationBarView } from './NavigationBarView';
import { NavigationContent1, NavigationContent2 } from './NavigationContentView';
@Preview
@Component
export struct TripleColumnView {
  @ObjectLink @Watch('widthBpChange') mainWindowInfo: WindowInfo;
  @State isShowingSidebar: boolean = this.mainWindowInfo.widthBp === WidthBreakpoint.WIDTH_LG ||
    this.mainWindowInfo.widthBp === WidthBreakpoint.WIDTH_XL ? true : false;
  pageInfos: NavPathStack = new NavPathStack();
  pathStack: NavPathStack = new NavPathStack();

  widthBpChange(): void {
    if (this.mainWindowInfo.widthBp === WidthBreakpoint.WIDTH_LG ||
      this.mainWindowInfo.widthBp === WidthBreakpoint.WIDTH_XL) {
      this.isShowingSidebar = true;
    } else {
      this.isShowingSidebar = false;
    }
  }

  @Builder
  PageMap(name: string) {
    if (name === 'navigationContent1') {
      NavigationContent1({
        mainWindowInfo: this.mainWindowInfo,
        isTripleView: true
      })
    } else if (name === 'navigationContent2') {
      NavigationContent2({ mainWindowInfo: this.mainWindowInfo })
    }
  }

  build() {
    Tabs({ barPosition: this.mainWindowInfo.widthBp === WidthBreakpoint.WIDTH_SM ? BarPosition.End : BarPosition.Start }) {
      TabContent() {
        SideBarContainer(new WidthBreakpointType(SideBarContainerType.Overlay, SideBarContainerType.Overlay,
          SideBarContainerType.Embed, SideBarContainerType.Embed).getValue(this.mainWindowInfo.widthBp)) {
          Column() {
            // [StartExclude triple_column_view]
            Image($r('app.media.open_sidebar'))
              .width(40)
              .height(40)
              .onClick(() => {
                this.isShowingSidebar = !this.isShowingSidebar;
              })
            Column() {
              Text('SidebarContainer')
                .fontSize(18)
                .margin({ bottom: 12 })
              Text($r('app.string.side_bar'))
                .fontSize(24)
            }
            .width('100%')
            .layoutWeight(1)
            .justifyContent(FlexAlign.Center)

            // [EndExclude triple_column_view]
          }
          // [StartExclude triple_column_view]
          .alignItems(HorizontalAlign.Start)
          .backgroundColor('#FFD6B5D6')
          .width('100%')
          .height('100%')
          .padding({
            top: this.getUIContext().px2vp(this.mainWindowInfo.AvoidSystem?.topRect.height) + 12,
            bottom: this.getUIContext().px2vp(this.mainWindowInfo.AvoidNavigationIndicator?.bottomRect.height),
            left: 16,
            right: 16
          })

          // [EndExclude triple_column_view]

          Column() {
            Navigation(this.pathStack) {
              NavigationBarView({
                mainWindowInfo: this.mainWindowInfo,
                pageInfos: this.pageInfos,
                pathStack: this.pathStack,
                isShowingSidebar: this.isShowingSidebar,
                isTriView: true
              })
            }
            .width('100%')
            .height('100%')
            .mode(this.mainWindowInfo.widthBp === WidthBreakpoint.WIDTH_SM ? NavigationMode.Stack :
              NavigationMode.Split)
            .navBarWidth(this.mainWindowInfo.widthBp === WidthBreakpoint.WIDTH_MD ? '50%' : '40%')
            .navDestination(this.PageMap)
            .backgroundColor('#B8EEB2')
          }
          // [StartExclude triple_column_view]
          .width('100%')
          .height('100%')

          // [EndExclude triple_column_view]
        }
        .showSideBar(this.isShowingSidebar)
        .sideBarWidth(new WidthBreakpointType('80%', '50%', '20%', '20%').getValue(this.mainWindowInfo.widthBp))
        // [End triple_column_view]
        .controlButton({ top: this.getUIContext().px2vp(this.mainWindowInfo.AvoidSystem?.topRect.height) + 12 })
        .showControlButton(false)
        .autoHide(false)
      }
      .tabBar("首页")
      TabContent() {
        Text("详情")
      }
      .tabBar("详情")
      TabContent() {
        Text("我的")
      }
      .tabBar("我的")
    }
    .vertical(this.mainWindowInfo.widthBp === WidthBreakpoint.WIDTH_SM ? false : true)
  }
}

上述代码可以实现当检测到小屏时，tabBar在最下方，大屏时设置横向显示tabBar并出现在左侧