HarmonyOS video设置加载图闪屏

@Entry @Component  
struct HeiSebeijing {  
  build() {  
    Row() {  
      Column() {  
        Text('before')  
        VideoComponent({url:'https://img.mcd.cn/cms/images/e3fa083cab2a0851.mp4'})  
        Text('after')  
      }  
      .width('100%')  
    } .height('100%')  
  }  
}  
@Component struct VideoComponent {  
  @State isVisibile:Visibility=Visibility.Hidden  
  controller: VideoController = new VideoController();  
  private url:string=''  
  build() {  
    Row() {  
      Video({ src: this.url, controller: this.controller })  
        .visibility(this.isVisibile)  
        .autoPlay(true)  
        .loop(true)  
        .controls(false)  
        .width('100%')  
        .height('200vp')  
        .onStart(() => {setTimeout(()=>{ this.isVisibile=Visibility.Visible  },100) })  
        .onPrepared(()=>{ this.controller.setCurrentTime(0,SeekMode.NextKeyframe) })   
    }   
  }   
}