SliverList 和 SliverFixedExtentLi

sliverList 高度自动
sliverFixedExtentList 高度死的

SliverList(
                  delegate: SliverChildBuilderDelegate((context, int index){
                    Container postPiece;
                    if (index == 0){
                      postPiece = Container(
                        child: Text('$index,高度是活的哦', style: TextStyle(color: Colors.grey),),
                      );
                    } else {
                      postPiece = Container(
                        child: Text('$index, 另一个容器啊', style: TextStyle(color: Colors.black),),
                      );
                    }
                    return postPiece;
                  },
                    childCount: 100,
                  ),
                ),

SliverFixedExtentList(
                  itemExtent: 50, //child的长度或者宽度,取决于滚动方向.
            delegate: SliverChildBuilderDelegate((context, int index) {
                   print(content.mainPost);
                 Container _piece;
                    if (index == 0){
                   _piece = Container(
                   child: Text('第一个',style: TextStyle(color: Colors.black),),
                    );
                   }else{
                     _piece = Container(
                        child: Text('另外一个', style: TextStyle(color: Colors.grey),),
                     );
                    }
                   return _piece;
                  },
                    childCount: 20,
                  ),
               ),

这边文章根据 https://www.cnblogs.com/pythonClub/p/10659521.html来试验了