HarmonyOS 使用RichEditor 自定义控件不显示

@Entry  
@Component  
struct Index {  
  @State message: string = 'Hello World';  
  controller: RichEditorController = new RichEditorController();  
  options: RichEditorOptions = { controller: this.controller };  
  private my_builder: CustomBuilder = undefined  
  aboutToAppear(): void {  
    this.my_builder = () => {  
      this.rcc('组件')  
    }  
  }  
  
  build() {  
    Column() {  
      RichEditor(this.options)  
        .onReady(() => {  
          this.controller.addTextSpan('this.htmlStr',  
            {  
              style:  
              {  
                fontColor: Color.Orange,  
                fontSize: 10  
              }  
            })  
          this.controller.addBuilderSpan(this.my_builder)  
        })  
    }  
  }  
  @Builder  
  rcc(str:string){  
    Row(){  
      RichText(str)  
        .backgroundColor(Color.Orange)  
        .width(100)  
        .height(100)  
    }  
  }  
}