Flutter学习之旅 -网格布局

GridView列表三种形式

可以通过GridView.count实现网格布局

/*
格式:
GridView.count(
      crossAxisCount: 一行显示数量,
      children: [
        component(),
        ...
      ],
    )
*/
class MyHomePage extends StatelessWidget {
  const MyHomePage({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return GridView.count(
      crossAxisCount: 3,
      children: const [
        Icon(Icons.home),
        Icon(Icons.settings),
        Icon(Icons.all_inclusive),
        Icon(Icons.ac_unit)
      ],
    );
  }
}

可以通过GridView.extent实现网格布局

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

  @override
  Widget build(BuildContext context) {
    return GridView.extent(
      maxCrossAxisExtent: 40, //主要。横轴子元素为固定最大长度(自动计算)
      children: const [
        Icon(Icons.home),
        Icon(Icons.settings),
        Icon(Icons.ac_unit),
        Icon(Icons.time_to_leave),
      ],
    );
  }
}

可以通过GridView.builder实现网格布局

参数:可以通过SliveGridDelegateWithFiexdCrossAxisCount来设置GridView.count
参数: 可以通过SliveGridDelegateWithMaxCrossAxisExtent来设置GridView.extent

List listData = [
  {
    "imageUrl": "http://124.223.18.34:5555/static/images/gdyg/gdyg1_1.jpg",
    "name": "孤独摇滚第1集"
  },
  {
    "imageUrl": "http://124.223.18.34:5555/static/images/gdyg/gdyg1_2.jpg",
    "name": "孤独摇滚第2集"
  },
  {
    "imageUrl": "http://124.223.18.34:5555/static/images/gdyg/gdyg1_3.jpg",
    "name": "孤独摇滚第3集"
  }
];
class MyHomePage extends StatelessWidget {
  const MyHomePage({Key? key}) : super(key: key);

  Widget _initDataWidget(context, index) {
    return Container(
      padding: const EdgeInsets.all(5),
      decoration: BoxDecoration(
          color: Colors.blue, borderRadius: BorderRadius.circular(5)),
      child: Column(
        children: [
          Image.network(listData[index]["imageUrl"]),
          Text(
            listData[index]["name"],
            style: const TextStyle(color: Colors.white),
          ),
        ],
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    return GridView.builder(
        padding: const EdgeInsets.all(10),
        itemCount: listData.length, //重点不然会报错(一直循环下去)
        gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
            crossAxisCount: 2, crossAxisSpacing: 10),
        itemBuilder: _initDataWidget);
  }
}

常用属性

名称	类型	说明
scrollDirection	Axis	滚动方法
padding	EdgeInsetsGeometry	内边距
resolve	bool	组件反向排序
crossAxisSpacing	double	水平子Widget之间间距
mainAxisSpacing	double	垂直子Widget之间间距
crossAxisCount	int,用在GridView.count	一行的Widget数量
maxCrossAxisExtent	double用在GridView.extent	横轴子元素的最大长度
childAspectRatio	double	子Widget宽高比例
children		[]
gridDelegate	`SliveGridDelegateWithFiexdCrossAxisCountSliveGridDelegateWithFiexdCrossAxisCount`;`SliveGridDelegateWithMaxCrossAxisExtent`	控制布局主要用在GridView.builder里面

小案例

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

  @override
  Widget build(BuildContext context) {
    return GridView.count(
      padding: const EdgeInsets.all(15),
      mainAxisSpacing: 15, //垂直子widget之间的间距
      crossAxisSpacing: 15, //水平子Widget之间的间距
      crossAxisCount: 2,
      //childAspectRatio: 1.2,//宽高比
      children: [
        Container(
          // padding: EdgeInsets.,

          decoration: BoxDecoration(
              color: Colors.blue, borderRadius: BorderRadius.circular(5)),
          child: Image.network(
            "http://124.223.18.34:5555/static/images/gdyg/gdyg1_1.jpg",
            alignment: Alignment.topCenter,
            fit: BoxFit.contain,
          ),
        ),
        Container(
          decoration: BoxDecoration(
              color: Colors.blue, borderRadius: BorderRadius.circular(5)),
          child: Image.network(
            "http://124.223.18.34:5555/static/images/gdyg/gdyg1_2.jpg",
            alignment: Alignment.topCenter,
            fit: BoxFit.contain,
          ),
        ),
        Container(
          decoration: BoxDecoration(
              color: Colors.blue, borderRadius: BorderRadius.circular(5)),
          child: Image.network(
            "http://124.223.18.34:5555/static/images/gdyg/gdyg1_3.jpg",
            alignment: Alignment.topCenter,
            fit: BoxFit.contain,
          ),
        )
      ],
    );
  }
}

在这里插入图片描述

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

  @override
  Widget build(BuildContext context) {
    return GridView.count(
      padding: const EdgeInsets.all(15),
      mainAxisSpacing: 15, //垂直子widget之间的间距
      crossAxisSpacing: 15, //水平子Widget之间的间距
      crossAxisCount: 2,
      //childAspectRatio: 1.2,//宽高比
      children: [
        Container(
            // padding: EdgeInsets.,

            decoration: BoxDecoration(
                color: Colors.blue, borderRadius: BorderRadius.circular(5)),
            child: Column(
              children: [
                Image.network(
                  "http://124.223.18.34:5555/static/images/gdyg/gdyg1_1.jpg",
                  alignment: Alignment.topCenter,
                  fit: BoxFit.contain,
                  width: 530,
                  height: 110,
                ),
                const Text(
                  "孤独摇滚第一集",
                  style: TextStyle(
                    color: Colors.white,
                  ),
                )
              ],
            )),
        Container(
            decoration: BoxDecoration(
                color: Colors.blue, borderRadius: BorderRadius.circular(5)),
            child: Column(
              children: [
                Image.network(
                  "http://124.223.18.34:5555/static/images/gdyg/gdyg1_2.jpg",
                  alignment: Alignment.topCenter,
                  fit: BoxFit.contain,
                  width: 530,
                  height: 110,
                ),
                const Text(
                  "孤独摇滚第二集",
                  style: TextStyle(
                    color: Colors.white,
                  ),
                )
              ],
            )),
        Container(
            decoration: BoxDecoration(
                color: Colors.blue, borderRadius: BorderRadius.circular(5)),
            child: Column(
              children: [
                Image.network(
                  "http://124.223.18.34:5555/static/images/gdyg/gdyg1_3.jpg",
                  alignment: Alignment.topCenter,
                  fit: BoxFit.contain,
                  width: 530,
                  height: 110,
                ),
                const Text(
                  "孤独摇滚第三集",
                  style: TextStyle(
                    color: Colors.white,
                  ),
                )
              ],
            ))
      ],
    );
  }
}