在列中添加行时出现错误。我收到以下错误:
I/flutter ( 6449): ??? EXCEPTION CAUGHT BY RENDERING LIBRARY ??????????????????????????????????????????????????????????
I/flutter ( 6449): The following assertion was thrown during performLayout():
I/flutter ( 6449): BoxConstraints forces an infinite width.
I/flutter ( 6449): These invalid constraints were provided to RenderAnimatedOpacity's layout() function
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我的代码也可供参考:
return new Scaffold(
backgroundColor: whiteColor,
body: new Column(
children: <Widget>[
imgHeader,
lblSignUp,
txtEmail,
Row(
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
txtFirstName,
txtLastName
],
),
],
),
);
Run Code Online (Sandbox Code Playgroud) 我试图在我的应用程序中显示小吃店以通知用户,但没有脚手架它会显示我的错误。我目前的代码是:
scaffoldKey.currentState?.showSnackBar(
new SnackBar(
backgroundColor: color ?? Colors.red,
duration: Duration(milliseconds: milliseconds),
content: Container(
height: 50.0,
child: Center(
child: new Text(
title,
style: AppTheme.textStyle.lightText.copyWith(color: Colors.white),
overflow: TextOverflow.ellipsis,
),
),
),
),
)
Run Code Online (Sandbox Code Playgroud) 我正在我的应用程序中实现 image_picker。那没有显示任何警告或消息,但是当我在 Android 模拟器中运行它时,它在控制台中显示了一个错误:
[ERROR:flutter/lib/ui/ui_dart_state.cc(148)] Unhandled Exception: MissingPluginException(No implementation found for method pickImage on channel plugins.flutter.io/image_picker)
E/flutter ( 5074): #0 MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:314:7)
E/flutter ( 5074): <asynchronous suspension>
E/flutter ( 5074): #1 ImagePicker.pickImage (package:image_picker/image_picker.dart:53:40)
E/flutter ( 5074): <asynchronous suspension>
Run Code Online (Sandbox Code Playgroud) 升级 Xcode 14.3 后,我的 flutter 运行无法在 iOS 上运行,但我可以在 Android 上运行。
\n我收到以下错误:
\nFailed to build iOS app\nError output from Xcode build:\n\xe2\x86\xb3\n 2023-04-03 17:29:33.364 xcodebuild[97688:923371] DVTCoreDeviceEnabledState: DVTCoreDeviceEnabledState_Disabled set via user default (DVTEnableCoreDevice=disabled)\n xcodebuild: error: Unable to find a destination matching the provided destination specifier:\n { id:6EB5FA1B-46DC-4E2D-BA30-9BF413BCB06F }\n\n Available destinations for the "Runner" scheme:\n { platform:macOS, arch:arm64, variant:Designed for [iPad,iPhone], id:00006000-001429C12E23801E }\n { platform:iOS, id:dvtdevice-DVTiPhonePlaceholder-iphoneos:placeholder, name:Any iOS Device }\n\nXcode's output:\n\xe2\x86\xb3\n Writing result bundle at path:\n /var/folders/k9/wbd7hvx90_s_1_rt6sqg61b80000gn/T/flutter_tools.3s0yqP/flutter_ios_build_temp_dirw6n3UV/temporary_xcresult_bundle\n\n\nCould not build the application for …Run Code Online (Sandbox Code Playgroud) 我已经安装了新版本的 Xcode 15.0。此后我无法运行我的 flutter 应用程序。它向我显示以下错误:
Error (Xcode): DT_TOOLCHAIN_DIR cannot be used to evaluate LIBRARY_SEARCH_PATHS, use TOOLCHAIN_DIR instead
Run Code Online (Sandbox Code Playgroud) 当用户点击注销时,我想删除Flutter的所有保存的共享首选项。有什么方法可以一次性完成而不删除一个吗?
我正在开发一款iPad应用程序.我想在其中集成SIRI功能.
所以,请指导我研究这个问题.其实我不知道如何开始.
谢谢,
CP
我正面临着在netbeans中启动我的tomcat服务器的问题.点击开始按钮时出现错误
"Starting of tomact failed, check whether the /Application/NetBeans/apache-tomcat-7.0.52/bin/catalina/sh and related scripts are executable."
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有关详细信息,请查看截图

我正在开发 Flutter 应用程序。在这个应用程序中,我在应用程序栏中使用了 TabBarController。我没有为 AppBar 使用图标和标题,所以高度显示的比我预期的要多。我需要帮助以所需的大小来做到这一点。我正在使用以下代码:
class Dashboard extends StatefulWidget{
@override
State<StatefulWidget> createState() => new _DashboardState();
}
class _DashboardState extends State<Dashboard> with SingleTickerProviderStateMixin{
final List<Tab> myTabs = <Tab>[
new Tab(text: 'page1.',),
new Tab(text: 'page2.'),
];
TabController _tabController;
@override
void initState() {
super.initState();
_tabController = new TabController(length: 3, vsync: this
);
}
@override
void dispose() {
_tabController.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: new AppBar(
bottom: new TabBar(
indicatorSize:TabBarIndicatorSize.tab,
controller: _tabController,
tabs: myTabs,
labelStyle: styleTabText,
),
), …Run Code Online (Sandbox Code Playgroud) 我想删除我的应用程序功能的应用程序图标.我想只在越狱设备中做到这一点.
如果有人知道我该怎么做,请指导我.