Flutter--SliverDemo

https://github.com/zzxingqiba/flutter_demo

import 'package:flutter/material.dart';

class SliverDemo extends StatelessWidget {
  const SliverDemo({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: CustomScrollView(
        slivers: [
          SliverAppBar(
            // title: Text('哈哈哈'), //與下面的title留一個就好
            // pinned: true, //是否固定住bar
            // floating: true, //往下滑消失 向上稍微滑動一點 立即出現bar
            expandedHeight: 178.0, //伸展空間
            flexibleSpace: FlexibleSpaceBar(
              centerTitle: true, //标題居中
              // titlePadding: EdgeInsets.all(0.0), //預設有padding 需要自己調整下
              title: Text(
                '哇哈哈哈哈',
                style: TextStyle(
                  fontSize: 15.0,
                  fontWeight: FontWeight.bold,
                  // letterSpacing: 3.0,
                ),
              ),
              background: Image.network(
                'https://img0.baidu.com/it/u=728913830,1403643466&fm=26&fmt=auto&gp=0.jpg',
                fit: BoxFit.cover, //填充
              ),
            ),
          ),
          SliverSafeArea(
            //劉海屏  SliverSafeArea顯示在安全區域
            sliver: SliverPadding(
              padding: EdgeInsets.all(8.0),
              sliver:
                  SliverListDemo(), //SliverGrid沒有padding屬性 ，是以要嵌套一層SliverPadding
            ),
          ),
        ],
      ),
    );
  }
}

class SliverGridDemo extends StatelessWidget {
  const SliverGridDemo({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return SliverGrid(
      delegate: SliverChildBuilderDelegate(
        (BuildContext context, int index) {
          return Container(
            color: Colors.brown[900],
            alignment: Alignment(0.0, 0.0),
            child: Text(
              '$index',
              style: TextStyle(fontSize: 32.0, color: Colors.white),
            ),
          );
        },
        childCount: 5,
      ),
      gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
        crossAxisCount: 2,
        crossAxisSpacing: 8.0,
        mainAxisSpacing: 8.0,
      ),
    );
  }
}

class SliverListDemo extends StatelessWidget {
  const SliverListDemo({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return SliverList(
      delegate: SliverChildBuilderDelegate(
        (BuildContext context, int index) {
          return Padding(
            padding: EdgeInsets.only(
              bottom: 32.0,
            ),
            child: Material(
              borderRadius: BorderRadius.circular(10.0),
              elevation: 14.0,
              shadowColor: Colors.grey.withOpacity(0.5),
              child: ClipRRect(
                borderRadius: BorderRadius.circular(10),
                child: Container(
                  child: Image.network(
                    'https://img1.baidu.com/it/u=2233362797,2905857249&fm=26&fmt=auto&gp=0.jpg',
                    fit: BoxFit.cover, //填充
                  ),
                ),
              ),
            ),
          );
        },
        childCount: 5,
      ),
    );
  }
}