如果body设置固定高度，用户的需求是，拉倒body的高度就停止，但是目前并不是这样，而是留有大量空白区域

[RmondJone]

ExtendedNestedScrollView(
                        key: scrollKey,
                        headerSliverBuilder: (BuildContext c, bool f) {
                          return [
                            //刷新视图
                            PullToRefreshContainer(
                              (PullToRefreshScrollNotificationInfo? info) {
                                return SliverToBoxAdapter(
                                  child: PullToRefreshHeader(
                                      info: info,
                                      lastRefreshTime: _lastDateTime),
                                );
                              },
                            ),
                            SliverToBoxAdapter(
                              child: shoppingCartIsNotEmpty
                                  ? renderShoppingCartList(model)
                                  : renderShoppingCartEmpty(),
                            )
                          ];
                        },
                        onlyOneScrollInBody: true,
                        body: Column(
                          children: [
                            Container(
                              decoration: BoxDecoration(color: Colors.red),
                              height: 50,
                            )
                          ],
                        ),
                      )

[zmtzawqlp]

as design