flutter GridView

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text("九宫格"),
        ),
        body: MyHomeBody(),
      ),
    );
  }
}

class MyHomeBody extends StatelessWidget {

  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return GirdViewWidget();
  }
}

class GirdViewWidget extends StatelessWidget {

  List<Widget> getGirdWidgets() {
    return List.generate(66, (index) {
      return Container(
        color: Colors.purple,
        alignment: Alignment(0, 0),
        child: Text("Item$index",style: TextStyle(fontSize: 20,color: Colors.white),),
      );
    });
  }

  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return GridView(
      gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
        crossAxisCount: 3,
        mainAxisSpacing: 5, // 行间距
        crossAxisSpacing: 5, // 列间距
        childAspectRatio: 1.0 // 宽高比
      ),
      children: getGirdWidgets(),
    );
  }
}