HarmonyOS 拍照怎么设置默认开启前置摄像头拍照

使用startAbilityForResult拉起系统相机不支持设置前后摄像头，可以使用相机服务样例代码如下：

export class UuCamera {
  takePhoneByAPI(mContext:
    Context
  )
  {
    async () => {
      try {
        let pickerProfile: cameraPicker.PickerProfile = { cameraPosition: camera.CameraPosition.CAMERA_POSITION_FRONT };
        let pickerResult: cameraPicker.PickerResult =
          await cameraPicker.pick(mContext, [cameraPicker.PickerMediaType.PHOTO, cameraPicker.PickerMediaType.VIDEO],
            pickerProfile);
        console.log("the pick pickerResult is:" + JSON.stringify(pickerResult));
      } catch (error) {
        let err = error as BusinessError;
        console.error(`the pick call failed. error code: ${err.code}`);
      }
    }
  }
}