Flutter_easyFresh 加载更多的一个BUG

设一个BOOL来控制加载更多那个显示和隐藏

      onLoad: _loadMore
          ? () async {
              await Future.delayed(Duration(seconds: 1), () {
                print('onLoad');
                setState(() {
                  _loadMore = false;
                  Future.delayed(Duration(milliseconds: 500), () {
                    setState(() {
                      _loadMore = true;
                    });
                  });
                });
                _controller.finishLoad(success: true, noMore: true);
              });
            }
          : null,