Flutter 頁面布局 Stack層疊組件

Stack 表示堆的意思，我們可以用 Stack 或者 Stack 結合 Align 或者 Stack 結合 Positiond 來實現頁面的定位布局

 

屬性	說明
alignment	配置所有子元素的顯示位置
children	子組件

Stack 組件中結合 Positioned 組件可以控制每個子元素的顯示位置

 

屬性	說明
top	子元素距離頂部的距離
bottom	子元素距離底部的距離
left	子元素距離左側距離
right	子元素距離右側距離
child	子組件

 

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 組件中結合 Align 組件可以控制每個子元素的顯示位置

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('我是一個文本',style: TextStyle(
            fontSize: 40,
            color: Colors.white
          ))           
        ],
      ),
    );
  }
}