Flutter - GridView

GridView 表格类布局

GridView 在构建是,有两种方式
1 SliverGridDelegateWithFixedCrossAxisCount

 mainAxisSpacing：主轴方向的间距。crossAxisSpacing：横轴方向子元素的间距。gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount:4, // 每行几个childAspectRatio: 1 //宽高比为1),

class MyGridView2 extends StatelessWidget {@overrideWidget build(BuildContext context) {// TODO: implement buildreturn GridView(padding: EdgeInsets.zero,gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount:4,childAspectRatio: 1 //宽高比为1),children: <Widget>[Container(width: double.infinity,color: Colors.blue,alignment: Alignment.center,child: Text("1",style: TextStyle(fontSize: 50,color: Colors.white),),),Container(width: double.infinity,color: Colors.red,alignment: Alignment.center,child: Text("2",style: TextStyle(fontSize: 50,color: Colors.white),),),Container(width: double.infinity,color: Colors.yellow,alignment: Alignment.center,child: Text("3",style: TextStyle(fontSize: 50,color: Colors.white),),),Container(width: double.infinity,color: Colors.green,alignment: Alignment.center,child: Text("4",style: TextStyle(fontSize: 50,color: Colors.white),),),Container(width: double.infinity,color: Colors.pink,alignment: Alignment.center,child: Text("5",style: TextStyle(fontSize: 50,color: Colors.white),),),Container(width: double.infinity,color: Colors.deepPurple,alignment: Alignment.center,child: Text("6",style: TextStyle(fontSize: 50,color: Colors.white),),),],);}
}

2 SliverGridDelegateWithMaxCrossAxisExtent

gridDelegate: SliverGridDelegateWithMaxCrossAxisExtent(maxCrossAxisExtent: 120.0,  // 每一个的宽度 ,但最后所有组件的宽度还是会平分的,这个值 起参考作用childAspectRatio: 1.0 //宽高比为1),

class MyGridView1 extends StatelessWidget {@overrideWidget build(BuildContext context) {// TODO: implement buildreturn GridView(padding: EdgeInsets.zero,gridDelegate: SliverGridDelegateWithMaxCrossAxisExtent(maxCrossAxisExtent: 120.0,childAspectRatio: 1.0 //宽高比为1),children: <Widget>[Icon(Icons.ac_unit),Icon(Icons.airport_shuttle),Icon(Icons.all_inclusive),Icon(Icons.beach_access),Icon(Icons.cake),Icon(Icons.free_breakfast),],);}
}

3 GridView.count 是 SliverGridDelegateWithFixedCrossAxisCount的快捷构建方式


class MyGridView3 extends StatelessWidget {@overrideWidget build(BuildContext context) {// TODO: implement buildreturn GridView.count(crossAxisCount:5,childAspectRatio: 0.5, //宽高比为1,children: <Widget>[Icon(Icons.ac_unit),Icon(Icons.airport_shuttle),Icon(Icons.all_inclusive),Icon(Icons.beach_access),Icon(Icons.cake),Icon(Icons.free_breakfast),],);}
}

4 GridView.extent 是 SliverGridDelegateWithMaxCrossAxisExtent 的快捷构建方式

class MyGridView4 extends StatelessWidget {@overrideWidget build(BuildContext context) {// TODO: implement buildreturn GridView.extent(maxCrossAxisExtent:300,childAspectRatio: 1, //宽高比为1,children: <Widget>[Icon(Icons.ac_unit),Icon(Icons.airport_shuttle),Icon(Icons.all_inclusive),Icon(Icons.beach_access),Icon(Icons.cake),Icon(Icons.free_breakfast),],);}
}

5 GridView.builder

上面我们介绍的GridView都需要一个widget数组作为其子元素，这些方式都会提前将所有子widget都构建好，所以只适用于子widget数量比较少时，当子widget比较多时，我们可以通过GridView.builder来动态创建子widget。GridView.builder 必须指定的参数有两个：

GridView.builder(...required SliverGridDelegate gridDelegate, required IndexedWidgetBuilder itemBuilder,
)


class MyGridView5 extends StatefulWidget {@overrideState<MyGridView5> createState() => MyGridView5State();
}class MyGridView5State extends State<MyGridView5> {List<IconData> _icons = []; //保存Icon数据@overridevoid initState() {super.initState();// 初始化数据_retrieveIcons();}@overrideWidget build(BuildContext context) {return GridView.builder(gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 3, //每行三列childAspectRatio: 1.0, //显示区域宽高相等),itemCount: _icons.length,itemBuilder: (context, index) {//如果显示到最后一个并且Icon总数小于200时继续获取数据if (index == _icons.length - 1 && _icons.length < 200) {print("${index}");_retrieveIcons();}return Icon(_icons[index]);},);}//模拟异步获取数据void _retrieveIcons() {Future.delayed(Duration(milliseconds: 200)).then((e) {setState(() {_icons.addAll([Icons.ac_unit,Icons.airport_shuttle,Icons.all_inclusive,Icons.beach_access,Icons.cake,Icons.free_breakfast,]);});});}
}

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