HarmonyOS webview侧滑返回上一页问题

import webview from '@ohos.web.webview'; 
 
@Entry 
@Component 
struct Page2 { 
 
  webController: webview.WebviewController = new webview.WebviewController(); 
 
  aboutToAppear(): void { 
    webview.WebviewController.setWebDebuggingAccess(true) 
  } 
  onBackPress() { 
    this.webController.backward(); 
    return true; 
  } 
 
  build() { 
    Row() { 
      Column() { 
        Web({ src: 'https://www.huawei.com', controller: this.webController }) 
      } 
      .width('100%') 
    } 
    .height('100%') 
  } 
}