Leove的专栏

SliverToBoxAdapter

在C:\Users\your-log-in-id\.android下新建立文件advancedFeatures.ini，并写入下面的内容Vulkan = offGLDirectMen = on

import 'package:flutter/material.dart';void main() => runApp(const MyApp());class MyApp extends StatelessWidget { const MyApp({Key? key}) : super(key: key); static const String _title = 'Flutter Code Sample'; @override Widget build(BuildC.

import 'dart:io';main() { //产生长度为5的数组，默认值为0 var myList = List<int>.filled(5, 0); myList[0] = 100; myList[1] = 200; myList[2] = 300;//1 第一种方式，通过for循环输出 for (int element in myList) { stdout.write('$element '); } print('one');//.

import 'dart:math';import 'package:flutter/material.dart';void main() { runApp(const MyApp());}class MyApp extends StatelessWidget { const MyApp({Key? key}) : super(key: key); // This widget is the root of your application. @override Wid.

【Flutter 专题】106 图解 AnimatedWidget & AnimatedBuilder 动画应用 - 云+社区 - 腾讯云AnimatedWidget class - widgets library - Dart API

Flutter中使用InheritedModel实现局部刷新，

Flame Engine的目标是为使用Flutter开发的游戏可能共享的常见问题提供一套完整的解决方案

和Stack类似，但是它只能显示多个组件中的一个，IndexedStack有一个注意的是它可以保持子组件的状态，比如用在选项卡上。

unrecognized Attribute name MODULE，UnsharedNameTable$NameImpl，Execution failed for task，Connect to repo.maven.apache.org:443

ReplaceonPressed: Navigator.push(...)withonPressed: () => Navigator.push(...)If you need to use await keyword, you can doonPressed: () async { await Navigator.push(...); await anyOtherMethod();}@Petro Navigator.push returns a Fut.

import 'package:flutter/material.dart';void main() { runApp(Demo());}class Demo extends StatelessWidget { //const Demo({Key key}) : super(key: key); @override Widget build(BuildContext context) { return MaterialApp( home: Scaffold(...

每次请求数据，带上sessionId //上传文件 static Future upload(String url, dynamic _formData) async { _dio.interceptors.add(CookieManager(cookieJar)); _dio.options.headers['cookie'] = 'JSESSIONID=$cookie';

常用的方式为flutter中提供了Visibility控件实现控件的隐藏或显示if(value)Text("根据value值显示或隐藏")上面两种方式为隐藏后，不占用空间。想要隐藏，但占用空间，可以用Opacity 透明度为1或0方式实现，但效率更高的可以采用前景颜色和背景色一样来实现隐藏效果。...

用边线指定的宽度和颜色绘制轮廓的形状顺序，有：BeveledRectangleBorder CircleBorder ContinuousRectangleBorder MaterialStateOutlinedBorder RoundedRectangleBorder StadiumBorder

生命周期State 类有状态组件的逻辑和内部状态有状态组件中的状态是指（1）在构建小部件时可以同步读取的信息（2）在小部件的生命周期内可能发生会发生变化。在状态更改时，组件的实现者有责任使用State.setState方法确保及时通知。

get | Flutter PackageOpen screens/snackbars/dialogs without context, manage states and inject dependencies easily with GetX.https://pub.flutter-io.cn/packages/get

Flutter中的第三方包 指纹识别、触摸ID、面部ID、密码、pin或图案local_auth

As a general rule, if the modified code is downstream of the root widget’s build method, then hot reload behaves as expected. However, if the modified code won’t be re-executed as a result of rebuilding the widget tree, then you won’t see its effects after

单选一，选择相关的文本或类别class MyThreeOptions extends StatefulWidget { const MyThreeOptions({Key? key}) : super(key: key); @override _MyThreeOptionsState createState() => _MyThreeOptionsState();}class _MyThreeOptionsState extends State<MyThreeOptio

flutter_colorpicker: Provides a material color picker for your apponPressed: () { // 4 showDialog( context: context, builder: (context) { // 5 return AlertDialog( .

copyWith 表示复制原来的对象，并可以在原来的基础上修改。copies and creates a completely new instance of XXXWidget

_pushMember(Member member) { Navigator.push( context, PageRouteBuilder( opaque: true, transitionDuration: const Duration(milliseconds: 1000), pageBuilder: (BuildContext context, _, __) { .

TimeOfDay类表示可以得到当前的时，分。或通过字符串解析成时间。TimeOfDay now = TimeOfDay.now();//得到当前时间const TimeOfDay releaseTime = TimeOfDay(hour: 15, minute: 0); //下午 3:00pmTimeOfDay roomBooked = TimeOfDay.fromDateTime(DateTime.parse('2018-10-20 16:30:04Z')); //下午 4:30pm..

Flutter Wrap组件实现自动布局，当前一行空间不够时，自动在下一行布局。Wrap( spacing: 8.0, // gap between adjacent chips runSpacing: 4.0, // gap between lines children: <Widget>[ Chip( avatar: CircleAvatar(backgroundColor: Colors.blue.shade900, child: const Text

Flutter RotatedBox 旋转对象的用法，比如竖的文本const RotatedBox( quarterTurns: 3, //旋转的角度数 child: Text('Hello World!'),)

Flutter学习网址https://mooc1-1.chaoxing.com/course/217310013.html

可以得到现在的时间日期，也可以进行日期的比较，还可以判断几天之后多少天等之类的情况var now = DateTime.now();var berlinWallFell = DateTime.utc(1989, 11, 9);var moonLanding = DateTime.parse("1969-07-20 20:18:04Z"); /var now = DateTime.now();var sixtyDaysFromNow = now.add(const Duration(da.

https://mooc1-1.chaoxing.com/course/217310013.html

https://www.bilibili.com/video/BV15b4y1Z7EU/?spm_id_from=333.788.recommend_more_video.0上面是课程的讲解，下面是代码////// [Author] Alex (https://github.com/AlexV525)/// [Date] 2021-04-30 12:41///import 'dart:math' as math;import 'dart:ui';import 'package:fl.

import 'dart:ui' as ui;......TextStyle( fontSize: 40, foreground: Paint() ..shader = ui.Gradient.linear( const Offset(0, 80), const Offset(80, 150), .

AlertDialog( title: const Text('标题!'), content: const Text('内容。。。。'), actions: <Widget>[ TextButton( onPressed: () { .

InheritedModel

Flutter StreamBuilder 的用法 异步流操作/// Flutter code sample for StreamBuilder// This sample shows a [StreamBuilder] that listens to a Stream that emits bids// for an auction. Every time the StreamBuilder receives a bid from the Stream,// it will display

Flutter FadeInImage 图片加载过程中，未加载完全前，显示的图片。可以查看官方网站，查到构造方法和属性的用法。

Flutter Table的用法Widget build(BuildContext context) { return Table( border: TableBorder.all(), columnWidths: const <int, TableColumnWidth>{ 0: IntrinsicColumnWidth(), 1: FlexColumnWidth(), 2: FixedColumnWidth(64), }.

Flutter 组件透明度的调整 OpacityOpacity( opacity: _visible ? 1.0 : 0.0, child: const Text("Now you see me, now you don't!"),)

对容器的属性值的变化进行动画显示/// Flutter code sample for AnimatedContainer// The following example (depicted above) transitions an AnimatedContainer// between two states. It adjusts the `height`, `width`, `color`, and// [alignment] properties when tapped.impor

上官方代码看的更清楚// Copyright 2020, the Flutter project authors. Please see the AUTHORS file// for details. All rights reserved. Use of this source code is governed by a// BSD-style license that can be found in the LICENSE file./// Shows how to handle arbi

隐式动画中包含了常用组件的动画，但是隐式动画仅仅是对属性的值进行修改，以便产生动画。而显式动画可以对任何的组件进行动画，使用范围更广，并且对动画也有了更多的控制。从性能上考虑，用child和static final Tween对变量。...