HarmonyOS 滑动调试音量滑块不显示问题

第一次滑动出现音量滑块，自动隐藏后再滑动不出现，帮忙看下是什么原因？

import { audio, AVVolumePanel } from '@kit.AudioKit';
@Entry
@Component
struct Index {

  @State curVolume: number = 50;
  @State maxVolume: number = 100;
  @State minVolume: number = 0;
  @State aVVolumePanelViewVisible :Visibility = Visibility.Hidden
  build() {
    Column() {
      AVVolumePanel({
        volumeLevel: this.curVolume,
        volumeParameter: {
          position: {
            x: 200,
            y: 200
          }
        }
      }).width(400)
        .height(800)
          // .visibility(this.aVVolumePanelViewVisible )
        .alignRules({
          right:{anchor: "__container__" , align : HorizontalAlign.Center},
          top : { anchor : "__container__" , align : VerticalAlign.Center}
        })
        .onTouch( (event:TouchEvent) =>{
          let startY :number  =0;
          let audioManager = audio.getAudioManager();
          let audioVolumeManager: audio.AudioVolumeManager = audioManager.getVolumeManager();
          let audioVolumeGroupManager: audio.AudioVolumeGroupManager = audioVolumeManager.getVolumeGroupManagerSync(audio.DEFAULT_VOLUME_GROUP_ID);

          audioVolumeGroupManager.getVolume(audio.AudioVolumeType.MEDIA).then((value) =>{
            this.curVolume =value;
            console.log("获取当前系统音量成功 curVolume="+this.curVolume)
          })
          if (event.type == TouchType.Down) {
            this.aVVolumePanelViewVisible = Visibility.Visible;
            startY = event.touches[0].y
            audioVolumeGroupManager.getMaxVolume(audio.AudioVolumeType.MEDIA).then((value) =>{
              this.maxVolume =value;
              console.log("获取当前系统音量成功 maxVolume="+this.maxVolume)
            })
            audioVolumeGroupManager.getMinVolume(audio.AudioVolumeType.MEDIA).then((value) =>{
              this.minVolume =value;
              console.log("获取当前系统音量成功 minVolume="+this.minVolume)
            })
            console.log("获取当前系统音量成功 maxVolume="+this.maxVolume)
          }else if (event.type == TouchType.Move){
            let  deltaY = event.touches[0].y - startY;
            console.log("")
            const volumeChange = Math.round((deltaY / 100) * this.maxVolume); // 滑动100像素改变最大音量的1%
            let newVolume = this.curVolume + volumeChange;
            newVolume = Math.max(0, Math.min(this.maxVolume, newVolume)); // 确保音量在合理范围内
            this.curVolume =newVolume;
          }else if (event.type == TouchType.Up){
          }else if (event.type == TouchType.Cancel){
          }
        })
        .hitTestBehavior(HitTestMode.Transparent)
    }.width('100%').height('100%')
  }
}
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