Flutter的基础知识之Dart语法

关于TextStyle的设置

import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget{@overrideWidget build(BuildContext context) {// TODO: implement buildreturn MaterialApp(title: 'Welcome to Flutter',home: Scaffold(appBar: AppBar(title: Text('FlutterNB!!!'),),body: Center(child: Text('Hello World wsj is a handsome man he has a wonderful eyes, he can do every things, he can do best in every ',textAlign: TextAlign.left,//设置文字对齐方式maxLines: 1,//设置屏幕中最多显示的文字行数overflow: TextOverflow.ellipsis,//字符超出一行后用省略号代替style:TextStyle(fontSize: 25,//设置字体的大小color: Color.fromARGB(255, 255, 123, 124),//设置字体的颜色decoration:TextDecoration.underline,//添加底部下划线decorationStyle: TextDecorationStyle.dotted,//添加底部下划线的样式),),),),);}
}

关于Container的设置

import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget{@overrideWidget build(BuildContext context) {return MaterialApp(title: 'Text widget',home: Scaffold(body:Center (child: Container(//相当于前端中的div，是一个容器child: new Text('Hello WSJ', style: TextStyle(fontSize: 40.0, color: Color.fromARGB(200, 212, 25, 20)),),alignment: Alignment.topLeft,//对齐方式width: 500.0,height: 400.0,//color: Colors.lightBlueAccent,//设置容器背景颜色//padding: const EdgeInsets.all(10.0),//设置内边距上下左右都设置padding: const EdgeInsets.fromLTRB(10.0, 30.0, 0, 0),//可以根据需要设置上下左右的内边距margin: const EdgeInsets.all(10),//设置外边距，就是容器相较于外边框的距离decoration: new BoxDecoration(gradient: const LinearGradient(//设置线性渐变colors: [Colors.lightBlueAccent, Colors.lightGreenAccent, Colors.purple]//设置线性渐变的颜色),border: Border.all(width: 5, color: Colors.red),//设置边框),),),),);}
}

关于Image组件的使用

import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget{//继承于静态的组件@overrideWidget build(BuildContext context) {return MaterialApp(title: 'Text Image',home: Scaffold(//脚手架结构appBar: new AppBar(title: new Text('Image'),),body: Center(//基本页面结构child: Container(//容器child: new Image.network(//'https://img00.zhaopin.cn/img_button/202010/09/58_195948343594.jpg','https://blogimages.jspang.com/blogtouxiang1.jpg',//fit: BoxFit.contain,//图片不做任何处理，按原图显示fit: BoxFit.fill,//按容器填满//fit: BoxFit.fitWidth,//横向填满图片，纵向有可能被裁切//fit: BoxFit.cover,//图片会充满整个容器，有可能被，拉伸也有可能被裁切//fit:BoxFit.scaleDown,//不会改变原图片大小color: Colors.lightGreenAccent,colorBlendMode: BlendMode.lighten,//将颜色与图片混合进行叠加repeat: ImageRepeat.repeat,//对图片进行重复),width: 400, height: 300,color: Colors.lightBlueAccent,),),),);}
}

ListView的使用ListTile

import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget{//静态组件@overrideWidget build(BuildContext context) {return MaterialApp(title: 'ListView',home: Scaffold(//脚手架appBar: new AppBar(title: new Text('Hello ListView')),body: new ListView(children: <Widget>[new ListTile(//ListTile 通常用于在 Flutter 中填充 ListView// leading: new Icon(Icons.account_balance),//添加小图标leading: CircleAvatar(//将图像或图表添加到列表的开头backgroundImage: NetworkImage('https://img95.699pic.com/photo/50137/3505.jpg_wh300.jpg'),),title: new Text('account_balance'),),new ListTile(//ListTile 通常用于在 Flutter 中填充 ListViewleading: new Icon(Icons.account_balance_wallet_rounded),//添加小图标title: new Text('account_balance_wallet_rounded'),),new ListTile(//ListTile 通常用于在 Flutter 中填充 ListViewleading: new Icon(Icons.add_a_photo_outlined),//添加小图标title: new Text('add_a_photo_outlined'),),],),),);}
}

ListView横向列表的使用

import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget{//静态小组件@overrideWidget build(BuildContext context) {// TODO: implement buildreturn MaterialApp(title: 'ListView',home: Scaffold(appBar: new AppBar(title: new Text('Hello ListView')),body: Center(child: Container(height: 200,child: MyList(),),),),);}
}
class MyList extends StatelessWidget{@overrideWidget build(BuildContext context) {// TODO: implement buildreturn ListView(scrollDirection: Axis.horizontal,//横向列表children: <Widget>[new Container(width: 180,color: Colors.lightBlue,),new Container(width: 180,color: Colors.yellow,),new Container(width: 180,color: Colors.deepOrange,),new Container(width: 180,color: Colors.purple,),],);}
}

ListView动态列表的使用

import 'package:flutter/material.dart';
void main() => runApp(MyApp(item:new List<String>.generate(1000, (i) => 'Item $i'),//i相当于数组下标，$i说明i是传递过去的
));
class MyApp extends StatelessWidget {final List<String> item;//接收参数MyApp({Key key, @required this.item}):super(key:key);//接收参数@overrideWidget build(BuildContext context) {// TODO: implement buildreturn MaterialApp(//title: '动态列表',home: Scaffold(appBar: new AppBar(title: new Text('动态列表'),),body: new ListView.builder(itemCount: item.length,//得到传递过来的数组长度itemBuilder: (context, index){return new ListTile(title: new Text('${item[index]}'),);},),),);}
}

网格列表

import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget{@overrideWidget build(BuildContext context) {// TODO: implement buildreturn MaterialApp(title: '网格列表',home: Scaffold(appBar: new AppBar(title: new Text('网格列表'),),// body: GridView.count(//   padding: const EdgeInsets.all(20),//   crossAxisSpacing: 10,//网格之间的边距//   crossAxisCount: 3,//每行显示的列数//   children: <Widget>[//     const Text('I am wsj'),//     const Text('I am zll'),//     const Text('I am book'),//     const Text('I am writting'),//     const Text('I am cccc'),//     const Text('I am zzzz'),//   ],// ),body: GridView(gridDelegate:SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 3,mainAxisSpacing: 2,//行间距crossAxisSpacing: 2,//列间距childAspectRatio: 0.7//横宽比),children: [new Image.network('http://img5.mtime.cn/mg/2021/01/15/093740.12876174.jpg', fit: BoxFit.cover),new Image.network('http://img5.mtime.cn/mt/2020/11/20/143205.34931246_1280X720X2.jpg', fit: BoxFit.cover),new Image.network('http://img5.mtime.cn/mt/2020/08/25/091724.62083337_1280X720X2.jpg', fit: BoxFit.cover),new Image.network('http://img5.mtime.cn/mt/2020/10/22/100702.49207766_1280X720X2.jpg', fit: BoxFit.cover),new Image.network('http://img5.mtime.cn/mt/2021/01/12/180520.10988653_1280X720X2.jpg', fit: BoxFit.cover),new Image.network('http://img5.mtime.cn/mt/2020/12/08/165505.14870477_1280X720X2.jpg', fit: BoxFit.cover),],),),);}
}

RowWidget布局详解之水平布局

import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget{@overrideWidget build(BuildContext context) {// TODO: implement buildreturn MaterialApp(title: 'RowWidget布局详解',home: Scaffold(appBar: new AppBar(title: new Text('水平布局'),),body: new Row(children: [new RaisedButton(//不灵活的点击事件，根据子元素的大小来分配空间onPressed: (){},//点击事件color: Colors.red,child: new Text('红色按钮'),),new RaisedButton(onPressed: (){},//点击事件color: Colors.orange,child: new Text('橙色按钮'),),Expanded(child:new RaisedButton(//灵活的水平布局，会平均分配空间onPressed: (){},//点击事件color: Colors.blue,child: new Text('蓝色按钮'),)),new RaisedButton(onPressed: (){},//点击事件color: Colors.green,child: new Text('绿色按钮'),),new RaisedButton(//灵活的水平布局onPressed: (){},//点击事件color: Colors.purple,child: new Text('紫色按钮'),)],),),);}
}

RowWidget布局之垂直布局

import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {@overrideWidget build(BuildContext context) {// TODO: implement buildreturn MaterialApp(title: 'RowWidget布局之垂直布局',home: Scaffold(appBar: new AppBar(title: Text('RowWidget布局之垂直布局')),body: Center(child:Column(crossAxisAlignment: CrossAxisAlignment.center,//副轴对其方式，因为布局方式是垂直布局，所以副轴就是水平的mainAxisAlignment: MainAxisAlignment.center,//主轴对齐方式children: [Text('I am wsj'),Expanded(child: Text('I am a handsome boy in the world')),Text('I love coding'),],),),),);}
}

层叠布局

import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget{@overrideWidget build(BuildContext context) {// TODO: implement buildvar stack = new Stack(alignment: const FractionalOffset(0.5, 0.9),children: [new CircleAvatar(backgroundImage: new NetworkImage('https://profile.csdnimg.cn/3/D/5/0_weixin_44290628'),radius: 100,),new Positioned(//相当于绝对布局top: 10,left: 40,child: new Text('wsj is handsome'),),new Positioned(child: Text('羽化登仙'),top: 150,left: 68,),// new Container(//   decoration: BoxDecoration(//     color: Colors.white70,//     borderRadius: BorderRadius.circular(10),//   ),//   padding: EdgeInsets.all(10),//   child: Text('羽化登仙'),// ),],);return MaterialApp(title: '层叠布局',home: Scaffold(appBar: AppBar(title: Text('层叠布局')),body: Center(child: stack,),),);}
}

11.导航的的参数传递和接收01

import 'package:flutter/material.dart';
void main(){runApp(MaterialApp(title: '导航栏演示01',home: new FirstScreen(),));
}
class FirstScreen extends StatelessWidget
{@overrideWidget build(BuildContext context) {// TODO: implement buildreturn Scaffold(appBar: AppBar(title: Text('导航页面')),body: Center(child: RaisedButton(//凸起按钮child: Text('查看商品详情页'),onPressed: (){//按钮按下时会产生什么样的操作，也就是按下动作的响应事件Navigator.push(context, MaterialPageRoute(//相当于页面的跳转builder: (context) => new SecondScreen()));},),),);}
}
class SecondScreen extends StatelessWidget
{@overrideWidget build(BuildContext context) {// TODO: implement buildreturn Scaffold(appBar: AppBar(title: Text('wsj最帅！！！')),body: Center(child: RaisedButton(child: Text('返回'),onPressed: (){Navigator.pop(context);},),),);}
}

导航的参数传递和接受02

import 'package:flutter/material.dart';
class Product{final String title;//商品标题final String decription;//商品描述Product(this.title, this.decription);
}
void main(){runApp(MaterialApp(title: '导航的数据和接收',home: ProductList(products:List.generate(20, (index) => Product('王少杰的商品 $index', '这是一个商品详情，编号为 $index'))),));
}
class ProductList extends StatelessWidget {final List<Product> products;ProductList({Key key, @required this.products}):super(key: key);//构造函数@overrideWidget build(BuildContext context) {return Scaffold(appBar: AppBar(title: Text('商品列表')),body: ListView.builder(itemCount: products.length,itemBuilder: (context, index){return ListTile(title: Text(products[index].title),onTap: (){//点击之后会有一个响应事件Navigator.push(context, MaterialPageRoute(builder: (context) => ProductDetail(product:products[index]),));},);},),);}
}
class ProductDetail extends StatelessWidget {final Product product;ProductDetail({Key key, @required this.product}):super(key: key);@overrideWidget build(BuildContext context) {return Scaffold(appBar: AppBar(title: Text('${product.title}')),body: Center(child: Text('${product.decription}'),),);}
}

页面跳转并返回数据

import 'package:flutter/material.dart';
void main(){runApp(MaterialApp(title: '页面跳转返回数据',home: FirstPage(),));
}
class FirstPage extends StatelessWidget{@overrideWidget build(BuildContext context) {// TODO: implement buildreturn Scaffold(appBar: AppBar(title: Text('要电话')),body: Center(child: RouteButton(),),);}
}
class RouteButton extends StatelessWidget {@overrideWidget build(BuildContext context) {return RaisedButton(onPressed: (){_navigatetophone(context);},child: Text('去要电话'),);}_navigatetophone(BuildContext context) async{//异步方法final result = await Navigator.push(context,MaterialPageRoute(builder: (context)=>Phone()));Scaffold.of(context).showSnackBar(SnackBar(content: Text('$result')));}
}
class Phone extends StatelessWidget {@overrideWidget build(BuildContext context) {return Scaffold(appBar: AppBar(title: Text('我是电话')),body: Center(child: Column(children: [RaisedButton(child: Text('长途电话'),onPressed: (){Navigator.pop(context, '长途电话：17666378389');}),RaisedButton(child: Text('国内电话'),onPressed: (){Navigator.pop(context, '国内电话：186555378389');}),],),),);}
}

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Flutter的基础知识之Dart语法

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