Flutter CustomScrollView 的使用 及 常用的Sliver系列组件

CustomScrollView简介

CustomScrollView是可以使用Sliver来自定义滚动模型（效果）的组件。它可以包含多种滚动模型。包括header，footer，CustomScrollView可以实现把多个彼此独立的可滑动widget组合起来。

CustomScrollView 一"码"当先

  Widget mCustomScrollView() {
    return CustomScrollView(
      slivers: [
        SliverAppBar(
          floating: true,
          title: Text('CustomScrollView Demo'),
          expandedHeight: 300,
          flexibleSpace: Image.network(
            "https://img2.baidu.com/it/u=1977503081,1869926726&fm=253&fmt=auto&app=138&f=JPEG?w=889&h=500",
            fit: BoxFit.cover,
          ),
        ),
        SliverList(
            delegate: SliverChildListDelegate([
          Container(
            height: 80,
            color: Colors.primaries[0],
          ),
          Container(
            height: 80,
            color: Colors.primaries[1],
          ),
          Container(
            height: 80,
            color: Colors.primaries[2],
          ),
          Container(
            height: 80,
            color: Colors.primaries[3],
          ),
          Container(
            height: 80,
            color: Colors.primaries[4],
          ),
        ])),
        SliverAppBar(
          pinned: false,
          expandedHeight: 250.0,
          backgroundColor: Colors.blue,
          flexibleSpace: FlexibleSpaceBar(
            background: Image.network(
              "https://img2.baidu.com/it/u=1977503081,1869926726&fm=253&fmt=auto&app=138&f=JPEG?w=889&h=500",
              fit: BoxFit.cover,
            ),
          ),
        ),
      ],