image: AssetImage("assets/images/background.jpg"), fit: BoxFit.cover, ), ), /*child替换为你自己的子widget*/ child: null, ), 感谢 Pexels上的Emre Can拍摄的照片 Flutter SDK Set Background image - Stack Overflow 结语 设置背景图其实并不复杂, 我们通过Container的decoration属性来控制了修饰的元素...
import 'package:flutter/material.dart'; void main() { runApp(MyApp()); } class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( home: Scaffold( body: Stack( children: [ Image.asset('assets/images/background.jpg', fit: BoxFit.cover), Opacity...
问如何绘制BackgroundImage (Flutter Web)的三角形前景EN// The Flutter framework has been optimized t...
分析flutter加载Image资源的原理,Image组件通过实现ImageProvider抽象类的loadBuffer方法(新的flutter版本load被loadBuffer替换)来加载图片资源数据,而AssetImage的loadBuffer方法实现如下: @override ImageStreamCompter loadBuffer(AssetBundleImageKey key, DecoderBufferCallback decode) { InformationCollector? collector; assert((...
CircleAvatar:显示用户头像。它的backgroundImage属性根据_image是否为空来设置用户头像图像或相机图标。_image为空时,显示相机图标,用户可以点击它来选择图像。 从效果上看: 用户首次看到页面时,头像区域显示一个相机图标,下方显示“点击头像选择图片”的文本。
setState(() {//改变状态this._currentIndex = 2; }); }, backgroundColor:this._currentIndex == 2 ?Colors.red : Colors.yellow, ), ), floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked, body:this._pageList[this._currentIndex], ...
在本例中,ImplicitAnimations部件包含一个_isPressed布尔变量和一个_togglePressed()函数,用于切换布尔变量的值。该部件的状态类在_togglePressed()中调用了setState(),以便在值发生变化时触发部件树的重建。 这个小部件的结构围绕着一个位于Scaffold中的Center小部件,这个Center小部件容纳了一个Column,它包含两个主要元...
image: AssetImage('assets/images/background.webp'), fit: BoxFit.cover, ), ), ), const SizedBox( width: 100.0, ), // 隐藏溢出部分 Container( width: 200.0, height: 200.0, decoration: BoxDecoration( border: Border.all( width: 2,
(background: Image.asset('assets/images/it_curtoon_1.png',fit: BoxFit.cover,),title: const Text('flutter-online.top'),),),// 同样的思路在这里再来一次SliverToBoxAdapter(child: LayoutBuilder(builder: (context, constraints) {if (constraints.maxWidth < 800) {// 当屏幕宽度小于800像素时,改...
Stack( alignment: const Alignment(0.6, 0.6), children: [ CircleAvatar( backgroundImage: AssetImage('images/pic.jpg'), radius: 100.0, ), Container( decoration: BoxDecoration( color: Colors.black45, ), child: Text( 'Hello World', style: TextStyle( fontSize: 20.0, fontWeight: FontWeight.bol...