HarmonyOS 如何在ablity中加载完成自定义字体

onWindowStageCreate(windowStage: window.WindowStage) {  
  // 为主窗口加载对应的目标页面。  
  windowStage.loadContent('pages/Index', (err, data) => { //TouchPage  
    //全局注册自定义字体  
    let uiContext = windowStage.getMainWindowSync().getUIContext();  
    uiContext.getFont().registerFont({  
      familyName: 'RuanMengXiaoGuoDong',  
      familySrc: $rawfile('RuanMengXiaoGuoDong.ttf')  
    })  
    if (err.code) {  
      hilog.error(0x0000, 'testTag', 'Failed to load the content. Cause: %{public}s', JSON.stringify(err) ?? '');  
      return;  
    }  
    hilog.info(0x0000, 'testTag', 'Succeeded in loading the content. Data: %{public}s', JSON.stringify(data) ?? '');  
  });  
}

@Entry  
@Component  
struct Index {  
  @State message: string = 'Hello World';  
   
  build() {  
    Row() {  
      Column() {  
        Text(this.message)  
          .fontFamily('RuanMengXiaoGuoDong')  
      }  
      .width('100%')  
    }  
    .height('100%')  
  }  
}