一个普通的GridView.builder
GridView.builder(gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
crossAxisCount: 3,//横排索引数量
crossAxisSpacing: 10,//交叉轴的间距
mainAxisSpacing: 10,//主轴的间距
childAspectRatio: 1.2//子元素宽高比
), itemBuilder:(context,index2){
return Container(child: //索引的内容
);
},itemCount: allhouseList.length,)//传入的集合