如何通过代码控制屏幕的横竖屏切换？

   import { window } from '@kit.ArkUI';
    let context = getContext(this) as common.UIAbilityContext;
    let windowClass: window.Window
    window.getLastWindow(context, (err, data) => {
      windowClass = data
    })

...
Button("旋转屏幕").onClick(() => {
  if (windowClass.getPreferredOrientation()===window.Orientation.LANDSCAPE) {
    windowClass.setPreferredOrientation(window.Orientation.PORTRAIT)//竖屏
  }else{
    windowClass.setPreferredOrientation(window.Orientation.LANDSCAPE)//横屏
  }

})
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