Flutter-7-GridView（常用方法）

我们在body属性中加入了网格组件，常用属性:

• padding:表示内边距，这个小伙伴们应该很熟悉。
• crossAxisSpacing:网格间的空当，相当于每个网格之间的间距。
• crossAxisCount:网格的列数，相当于一行放置的网格数量。
  代码：
  import 'package:flutter/material.dart';
  void main () => runApp(MyApp());

class MyApp extends StatelessWidget{
@override
Widget build(BuildContext context ){
return MaterialApp(
title:'ListView widget',
home:Scaffold(
body:GridView.count(
padding:const EdgeInsets.all(20.0),
crossAxisSpacing: 10.0,
crossAxisCount: 3,
children: <Widget>[
const Text('I am yzl'),
const Text('I love Web'),
const Text('213123'),
const Text('21'),
const Text('213'),
const Text('213123')
],
)
),
);
}
}

图片网格列表:
import 'package:flutter/material.dart';
void main () => runApp(MyApp());

class MyApp extends StatelessWidget{
@override
Widget build(BuildContext context ){
return MaterialApp(
title:'ListView widget',
home:Scaffold(
body:GridView(
gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
crossAxisCount: 3,
mainAxisSpacing: 2.0,
crossAxisSpacing: 2.0,
childAspectRatio: 0.7
),
children: <Widget>[
new Image.network('http://img5.mtime.cn/mt/2018/10/22/104316.77318635_180X260X4.jpg',fit: BoxFit.cover),
new Image.network('http://img5.mtime.cn/mt/2018/10/10/112514.30587089_180X260X4.jpg',fit: BoxFit.cover),
new Image.network('http://img5.mtime.cn/mt/2018/11/13/093605.61422332_180X260X4.jpg',fit: BoxFit.cover),
new Image.network('http://img5.mtime.cn/mt/2018/11/07/092515.55805319_180X260X4.jpg',fit: BoxFit.cover),
new Image.network('http://img5.mtime.cn/mt/2018/11/21/090246.16772408_135X190X4.jpg',fit: BoxFit.cover),
new Image.network('http://img5.mtime.cn/mt/2018/11/17/162028.94879602_135X190X4.jpg',fit: BoxFit.cover),
new Image.network('http://img5.mtime.cn/mt/2018/11/19/165350.52237320_135X190X4.jpg',fit: BoxFit.cover),
new Image.network('http://img5.mtime.cn/mt/2018/11/16/115256.24365160_180X260X4.jpg',fit: BoxFit.cover),
new Image.network('http://img5.mtime.cn/mt/2018/11/20/141608.71613590_135X190X4.jpg',fit: BoxFit.cover),

        ],
      )
    ),
  );

}
}
childAspectRatio:宽高比，这个值的意思是宽是高的多少倍，如果宽是高的2倍，那我们就写2.0，如果高是宽的2倍，我们就写0.5。希望小伙伴们理解一下。