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View Code? Open in Web Editor NEW【Flutter 集录指南 App】The unity of flutter, The unity of coder.
License: GNU General Public License v3.0
【Flutter 集录指南 App】The unity of flutter, The unity of coder.
License: GNU General Public License v3.0
感谢做出这么好用的工具
两种方式都可以 :
var px = 1 / window.devicePixelRatio;
var px1 = 1 / (MediaQuery.of(context).devicePixelRatio);
长按输入框,复制粘贴pop文字显示不全,英文环境下没问题
可以用runtimeType
class Person {
Person(){
print('$runtimeType被初始化了');
}
}
class Student extends Person{
}
class Teacher extends Person{
}
main(){
Student();
}
CustomPaint 组件页渲染非常卡,滑到 贝塞尔曲线那里,就没反应了,卡住不动,要等好久
const isPro = bool.fromEnvironment('dart.vm.product'); //是否release模式
如果list的每个item都设置上一个key,那么如果他不显示在界面上了,会释放掉吗?
可以怎么测试一下这个?通过分析app的内存是否一直在增长?
widgetId怎么设置的,怎么匹配到flutter.db的呢?iOS 点击pageview sql语句传的数组为[]
我觉得futter的性能是众多犹豫者最在乎的之一,如果有一个比较可视的性能展示可能会对很多人有帮助
Botton相关的样式由ButtonTheme
进行管理。默认高度是36
---->[flutter/packages/flutter/lib/src/material/button_theme.dart:250]<----
const ButtonThemeData({
this.textTheme = ButtonTextTheme.normal,
this.minWidth = 88.0,
this.height = 36.0, <----
EdgeInsetsGeometry padding,
本issue集录一些好用的Flutter插件,由 编程技术交流圣地[-Flutter群-]
伙伴共同收录分享。
main() {
var isJava=true;
<String>[
if (isJava) "Java" else "NO java",//dart2.3+ 数组元素内可进行if判断
"Dart",
"Swift",
...["Kotlin", "python"]//将一个数组中的元素进行解构成一个个元素
];
}
怎么防止FutureBuilder过度刷新当前页面,进入当前页面后 在页面setState操作后 会再次刷新FutureBuilder
在基础组建库中m
decoration: BoxDecoration(
//添加渐变色
gradient: LinearGradient(
stops: stops,
colors: Cons.rainbow.map((e) => Color(e)).toList()),
borderRadius: BorderRadius.only(
topLeft: Radius.circular(50),
bottomRight: Radius.circular(50)),
boxShadow: [
BoxShadow(
color: Colors.grey,
offset: Offset(1, 1),
blurRadius: 10,
spreadRadius: 1),
]),
其中Cons是什么?我的版本是1.17.1
pc上素手无策,还要去专门保存图片去解码拿地址
通常这个索引是点击控件之后,wheel自动选择到设置后的索引项
如当前选择的索引为0
那么,如何在点击选择之前,设置索引为1,使其自动选中到“忙碌”呢
控件网址https://api.flutter.dev/flutter/cupertino/CupertinoPicker-class.html
这是报错信息
"Frameworks/App.framework/flutter_assets"
2020-04-22 23:46:15.168972+0800 Runner[5419:2029601] [VERBOSE-2:engine.cc(127)] Engine run configuration was invalid.
2020-04-22 23:46:15.169085+0800 Runner[5419:2029601] [VERBOSE-2:shell.cc(437)] Could not launch engine with configuration.
大佬还是大佬啊,太牛逼了 👍
flutter初学者的天堂,感谢万分👍
不过还有一些闪退的问题,还望大佬闲暇之余处理一下 👍
持续 关注
希望增加一个网页版, 这样电脑上查起来方便一点
还是只能直接在你的项目里写项目吗?
demo中DataTable表格右侧显示不完整。另外想请教一下,如果想用dataTable(毕竟自带复选)而不是Table,如何做到按照屏幕自动均分或按比例分宽度?
Windows桌面程序咋运行
依赖装完之后,用Xcode运行起来直接打印下面问题
2020-04-24 16:25:53.655760+0800 Runner[7781:1889055] Failed to find assets path for "Frameworks/App.framework/flutter_assets"
2020-04-24 16:25:53.929452+0800 Runner[7781:1889055] Metal API Validation Enabled
2020-04-24 16:25:54.433538+0800 Runner[7781:1889234] [VERBOSE-2:engine.cc(127)] Engine run configuration was invalid.
2020-04-24 16:25:54.433755+0800 Runner[7781:1889234] [VERBOSE-2:shell.cc(437)] Could not launch engine with configuration.
2020-04-24 16:25:54.453264+0800 Runner[7781:1889243] flutter: Observatory listening on http://127.0.0.1:53261/ObwJBGhGVG8=/
正好在学习flutter,感谢大佬.打算体验安装,结果安装失败. 手机提示.失败原因: 其它原因.
有些页面点击进去的时候路由动画明显卡顿掉帧。。
我是小米mix2 。
这是什么原因。初始化的时候child组件太多了嘛
This requires the 'spread-collections' experiment to be enabled.
... 操作符
至少需要dart 2.3.0
pubspec.yaml 文件中
environment:
sdk: ">=2.3.0 <3.0.0"
1,查提示错误关键词
2,尝试新建一个项目发现并没有报错,对比新老项目发现 environment的sdk 版本不一致
根据需求下载FlutterSDK版本,一般使用稳定版的最新版本。
vim ~/.bash_profile
export PATH= flutterSDK磁盘路径/bin:$PATH
export PUB_HOSTED_URL=https://pub.flutter-io.cn
export FLUTTER_STORAGE_BASE_URL=https://storage.flutter-io.cn
flutter --version
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