HarmonyOS RichEditor 使用问题

@Entry 
@Component 
struct RichEditorDemo2 { 
  @State message: string = 'Hello World'; 
  controller: RichEditorController = new RichEditorController(); 
  options: RichEditorOptions = { controller: this.controller }; 
 
  build() { 
    Column() { 
      RichEditor(this.options) 
        .onReady(() => { 
          this.controller.addTextSpan("012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789\n", 
            { 
              style: 
              { 
                fontColor: Color.Orange, 
                fontSize: 30 
              } 
            }) 
          this.controller.addImageSpan($r("app.media.app_icon"), 
            { 
              imageStyle: 
              { 
                size: ["200px", "200px"], 
                verticalAlign: ImageSpanAlignment.BOTTOM, 
                layoutStyle: { 
                  borderRadius: { topLeft: '10px', topRight: '20px', bottomLeft: '30px', bottomRight: '40px' }, 
                  margin: { left: '10px', top: '20px', right: '30px', bottom: '40px' } 
                } 
              }, 
              //offset: 50 
            }) 
          this.controller.addTextSpan("\n") 
          this.controller.addTextSpan("0123456789", 
            { 
              style: 
              { 
                fontColor: Color.Orange, 
                fontSize: 30 
              } 
            }) 
        }) 
    } 
    .height('100%') 
  } 
}