SliverList , SliverFixedExtentList

SliverList 高度自动,

SliverFixedExtentList 高度固定死.

CustomScrollView(
              slivers:[

                SliverList(
                  delegate: SliverChildBuilderDelegate((context, int index){
                    Container postPiece;
                    if (index == 0){
                      postPiece = Container(
                        child: Text('$index , aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa', style: TextStyle(color: Colors.grey),),
                      );
                    } else {
                      postPiece = Container(
                        child: Text('$index, bbbbbbbbbbbbb', 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('dsssouu',style: TextStyle(color: Colors.black),),
//                      );
//                    }else{
//                      _piece = Container(
//                        child: Text('aaaa', style: TextStyle(color: Colors.grey),),
//                      );
//                    }
//                    return _piece;
//                  },
//                    childCount: 20,
//                  ),
//                ),

            ],
            ),