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Flutter 页面布局 Stack层叠组件

Stack 表示堆的意思,我们可以用 Stack 或者 Stack 结合 Align 或者 Stack 结合 Positiond 来实现页面的定位布局

 

属性

说明

alignment

配置所有子元素的显示位置

children

子组件

Stack 组件中结合 Positioned 组件可以控制每个子元素的显示位置

 

属性

说明

top

子元素距离顶部的距离

bottom

子元素距离底部的距离

left

子元素距离左侧距离

right

子元素距离右侧距离

child

子组件

 

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(‘FlutterDemo‘)),
      body: LayoutDemo(),
    ));
  }
}

class LayoutDemo extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Center(
      child:  Container(
            height: 400,
            width: 300,
            color: Colors.red,
            child: Stack(
              // alignment: Alignment.center,
              children: <Widget>[
                Positioned(
                //  left: 10,
                  child: Icon(Icons.home,size: 40,color: Colors.white),
                ),
                Positioned(
                 bottom: 0,
                 left: 100,
                  child: Icon(Icons.search,size: 30,color: Colors.white),
                ),
                Positioned(
                  right: 0,
                  child: Icon(Icons.settings_applications,size: 30,color: Colors.white),
                )
              ],
            ),
      ),
    );
  }
}

Stack 组件中结合 Align 组件可以控制每个子元素的显示位置

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(‘FlutterDemo‘)),
      body: LayoutDemo(),
    ));
  }
}

class LayoutDemo extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Center(
      child:  Container(
            height: 400,
            width: 300,
            color: Colors.red,
            child: Stack(
              // alignment: Alignment.center,
              children: <Widget>[
                Align(
                  alignment: Alignment(1,-0.2),
                  child: Icon(Icons.home,size: 40,color: Colors.white),
                ),
                Align(
                  alignment: Alignment.center,
                  child: Icon(Icons.search,size: 30,color: Colors.white),
                ),
                Align(
                  alignment: Alignment.bottomRight,
                  child: Icon(Icons.settings_applications,size: 30,color: Colors.white),
                )
              ],
            ),
      ),
    );
  }
}

 

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(‘FlutterDemo‘)),
      body: LayoutDemo(),
    ));
  }
}

class LayoutDemo extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Center(
      child: Stack(
        alignment: Alignment.topLeft,
        children: <Widget>[              
          Container(
            height: 400,
            width: 300,
            color: Colors.red,
          ),
          Text(‘我是一个文本‘,style: TextStyle(
            fontSize: 40,
            color: Colors.white
          ))           
        ],
      ),
    );
  }
}

 

时间:2019-07-12 10:23:32阅读(48)
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