dark-theme 相关问题

Echart.js 图表未显示工具提示

我正在使用 Echart.js 库。 var echartLine = echarts.init(document.getElementById('myChart'), theme); 在 echart 选项中我添加：工具提示：{ 显示：真实，

WinUI 3 嵌套资源字典？

可以嵌套多级字典吗？像这样的东西：可以嵌套多级字典吗？像这样的东西： <?xml version="1.0" encoding="utf-8"?> <ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"> <ResourceDictionary.ThemeDictionaries> <ResourceDictionary x:Key="Dark"> <ResourceDictionary x:Key="Button1"> <SolidColorBrush x:Key="ButtonBackground" Color="HotPink" /> <SolidColorBrush x:Key="ButtonBackgroundDisabled" Color="HotPink" /> <SolidColorBrush x:Key="ButtonBackgroundPressed" Color="HotPink" /> <SolidColorBrush x:Key="ButtonBackgroundPointerOver" Color="HotPink" /> <SolidColorBrush x:Key="ButtonForeground" Color="White" /> <SolidColorBrush x:Key="ButtonForegroundPointerOver" Color="White" /> <SolidColorBrush x:Key="ButtonBorderBrush" Color="White" /> <SolidColorBrush x:Key="ButtonBorderBrushPointerOver" Color="White" /> <SolidColorBrush x:Key="ButtonBorderBrushFocused" Color="White" /> <SolidColorBrush x:Key="ButtonBorderBrushPressed" Color="White" /> </ResourceDictionary> </ResourceDictionary> </ResourceDictionary.ThemeDictionaries> </ResourceDictionary> 是否可以以某种方式访问Button1字典？ ResourceDictionary 应该添加到 MergedDictionary 中，所以你不能使用这个 <ResourceDictionary x:Key="Dark"> <ResourceDictionary x:Key="Button1"> 如果您想为按钮定义多种样式，您应该这样做： <ResourceDictionary x:Key="Light"> <Style x:Key="Button1"

哦我的 zsh 显示出奇怪的字符“？”在终端

我已经安装了 iTerm2 和 Oh-my-zsh。然而，自从我将 ZSH-THEME 更改为“agnoster”后，出现了一个奇怪的问号。附上相同的屏幕截图。我以为

WordPress - 这个主题已损坏。缺少父主题。请安装“THEME”父主题

在我的WordPress网站中，我创建了一个基于主题Divi的子主题，子主题工作完美并且从未出现过问题，它不会在屏幕上显示任何PHP错误消息......

顺风未加载颜色

有简单的html：公共/index.html：有简单的html： public/index.html: <!DOCTYPE html> <html> <head> <link rel="stylesheet" href="styles.css"> </head> <body class="text-red-600"> some text </body> css 是从 tailwindcss -i src/styles.css -o public/styles.css 获取的 src/styles.css: @tailwind base; @tailwind components; @tailwind utilities; tailwind.config.js: module.exports = { content: ["./src/**/*.{html,js}"], theme: { extend: {}, }, plugins: [], } <body>标签中的红色不适用。默认的顺风类别是否导入到public/styles.css？ Tailwind 配置中的 public/index.html 文件似乎没有覆盖 content 文件。您必须确保使用 Tailwind 类的源代码文件被 content 文件 glob 覆盖，否则 Tailwind 将不会扫描这些文件，也不会为存在的类名生成 CSS 规则。考虑阅读有关配置的文档content。 module.exports = { content: [ "./src/**/*.{html,js}", "./public/index.html", ], theme: { extend: {}, }, plugins: [], }

如何让 MUI 的带有链接的按钮看起来像普通按钮？

我有一个按钮可以下载带有文件名的文件。为此，我写了这样的内容：我有一个按钮可以下载带有文件名的文件。为此，我写了这个： <Button color='primary' href=`/apiproxy/objects/${id}/subobjects` LinkComponent={React.forwardRef((props, ref) => <Link {...props} type='text/csv' download={`object_${id}_subobjects.csv`} ref={ref} />)} /> 生成的元素看起来与我的其他没有 href 属性的按钮相同（也带有 color='primary'），但悬停时其文本颜色更改为蓝色，与其他按钮不同，它保持白色。如何使其样式与其他按钮相同？我可以将 &:hover 文本颜色指定为白色，但是当主题更改其他按钮的文本颜色时，这会中断。有没有办法更改链接组件，使其样式与其他按钮相同，或者如果没有，按钮在调色板中使用什么作为悬停文本颜色，以便我可以将其设置为该颜色？我认为您可以使用 styledComponent 作为链接组件。就像下面... const theme = useTheme(); const StyledLink = styled(Link)(({ theme, color = "primary" }) => ({ ":hover": { color: theme.palette.secondary.main, }, })); <Button color="primary" href="/apiproxy/objects/1/subobjects" LinkComponent={React.forwardRef((props, ref) => ( <StyledLink {...props} type="text/csv" download={"object_1_subobjects.csv"} ref={ref} theme={theme} /> ))} /> 您可以在 theme.js 文件中的调色板中设置悬停颜色，并使用该颜色，如 theme.palette.${hoverColor} 请检查此测试组件。 https://codesandbox.io/p/sandbox/mui-28251-28335-forked-j2x8cd?file=%2Fsrc%2FApp.js 也许您可以让按钮将它们重定向到可以下载文件的 MediaFire： <a href="link-to-media"><button class="buttonClass">Download</button></a> 然后你可以将buttonClass修改为你喜欢的任何内容。

用 Bootsrap 制作的网站右侧的空间不会消失吗？

无论我做什么，我用 Bootsrap 制作的网站右侧的空白都没有消失。如果有解决办法请告诉我无论我做什么，我用 Bootsrap 制作的网站右侧的空白都没有消失。如果有解决办法请告诉我 <!doctype html> <html lang="en"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <title>Contact | Enba Camping</title> <link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-T3c6CoIi6uLrA9TneNEoa7RxnatzjcDSCmG1MXxSR1GAsXEV/Dwwykc2MPK8M2HN" crossorigin="anonymous"> <link rel="stylesheet" href="style/style.css"> <link rel="preconnect" href="https://fonts.googleapis.com"> <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin> </head> <body> <script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js" integrity="sha384-C6RzsynM9kWDrMNeT87bh95OGNyZPhcTNXj1NW7RuBCsyN/o0jlpcV8Qyq46cDfL" crossorigin="anonymous"></script>  <div class="container-fluid"> <div class="row"> <div class="col-sm-12 p-0"> <nav class="navbar navbar-expand-lg bg-body-tertiary p-0 "> <div class="container-fluid bg-dark "> <a class="navbar-brand text-light mb-2" href="index.html">Enba Camping</a> <button class="navbar-toggler btn btn-light btn btn-outline-light bg-light m-2" type="button" data-bs-toggle="collapse" data-bs-target="#navbarNavAltMarkup" aria-controls="navbarNavAltMarkup" aria-expanded="false" aria-label="Toggle navigation"> <span class="navbar-toggler-icon "></span> </button> <div class="collapse navbar-collapse" id="navbarNavAltMarkup"> <div class="navbar-nav ms-auto"> <a class="nav-link text-light text-center" aria-current="page" href="index.html">Home</a> <a class="nav-link text-light text-center" href="aboutus.html">About us</a> <a class="nav-link active text-light text-center" href="contact.html" aria-disabled="true">Contact</a> </div> </div> </div> </nav> </div> </div> </div>   <div class="container-fluid p-0 bg-dark text-light"> <div class="row"> <div class="col-sm-6 ps-0"> <img src="images/lesly-derksen-F4fH5dAfZnE-unsplash.jpg" alt="" class=" d-block w-100 c-img "> </div> <div class="col-sm-6 d-flex justify-content-center align-items-center "> <div class="text-center"> <h2 class="fw-bold display-4 ">Bize Ulaşın</h2>  <div class="mb-3"> <label for="exampleFormControlInput1" class="form-label">Adınız</label> <input type="email" class="form-control" id="exampleFormControlInput1" placeholder="Name"> </div> <div class="mb-3"> <label for="exampleFormControlInput1" class="form-label">Email Adres</label> <input type="email" class="form-control" id="exampleFormControlInput1" placeholder="Email Address"> </div> <div class="mb-3"> <label for="exampleFormControlTextarea1" class="form-label">Mesajınız</label> <textarea class="form-control" id="exampleFormControlTextarea1" placeholder="Message" rows="3"></textarea> </div> <div class=" gap-2 d-md-block "> <button class="btn btn-light " type="button">Send</button> </div> </div> </div> </div> </div>   <div class="container mt-sm-5"> <div class="row text-center "> <h1 class="d-flex justify-content-center">Mekanlarımız</h1> <hr> <div class="col-sm-4 mb-2"> <div class="card"> <img src="images/card2.jpg" class="card-img-top" alt="..."> <div class="card-body"> <h5 class="card-title">Orman İçi Karavan Parkı</h5> <p class="card-text">Ormanın içinde konumlanan karavan parkımız, tam anlamıyla bir doğa kaçamağı sunuyor. Ormanın huzurlu atmosferinde kendinizi kaybedin. Karavanınızla konforlu bir konaklama deneyimi yaşayın.</p> <a href="#" class="btn btn-dark">Rezervasyon için tıklayınız </a> </div> </div> </div> <div class="col-sm-4 mb-2"> <div class="card"> <img src="images/card3.jpg" class="card-img-top" alt="..."> <div class="card-body"> <h5 class="card-title">Orman İçi Çadırlı Kamp</h5> <p class="card-text">Orman içi çadırlı kamp alanımız, doğa severler için bir cennet. Gölgeli ağaçlar arasında konumlanan çadırlarımızda, kuş cıvıltıları ve huzur içinde bir konaklama deneyimi sizi bekliyor.</p> <a href="#" class="btn btn-dark">Rezervasyon için tıklayınız</a> </div> </div> </div> <div class="col-sm-4 mb-2"> <div class="card"> <img src="images/card1.jpg" class="card-img-top" alt="..."> <div class="card-body"> <h5 class="card-title">Dağ Evi </h5> <p class="card-text">Dağ evimiz, şehrin gürültüsünden uzak,huzurlu bir konaklama imkanı sunuyor. Ferah odalarımızda dağ manzarasının keyfini çıkarabilir, gölet kenarındaki aktivitelerle vakit geçirebilirsiniz.</p> <a href="#" class="btn btn-dark">Rezervasyon için tıklayınız</a> </div> </div> </div> </div> </div>   <div class="row my-4"> <div class="col-sm-12"> <h1 class="d-flex justify-content-center">Galeri</h1> <hr> </div> <div class="col-sm col-6 mb-1"><img src="images/galeri/hichem-meghachou-7I-Rj_E9ihI-unsplash.jpg" alt="" class="w-100 img-thumbnail"> </div> <div class="col-sm col-6 mb-1"><img src="images/galeri/jimmy-conover-J_XuXX9m0KM-unsplash.jpg" alt="" class="w-100 img-thumbnail"> </div> <div class="col-sm col-6 mb-1"><img src="images/galeri/josh-campbell-UbbjVyibFuc-unsplash.jpg" alt="" class="w-100 img-thumbnail"> </div> <div class="col-sm col-6 mb-1"><img src="images/galeri/shelby-cohron-ESNV6KmLJMg-unsplash.jpg" alt="" class="w-100 img-thumbnail"> </div> <div class="col-sm col-6 mb-1"><img src="images/galeri/tegan-mierle-fDostElVhN8-unsplash.jpg" alt="" class="w-100 img-thumbnail"> </div> <div class="col-sm col-6 mb-1"><img src="images/galeri/toa-heftiba-x9I-6yoXrXE-unsplash.jpg" alt="" class="w-100 img-thumbnail"> </div> </div>   <div class="bg-dark text-light"> <div class="container"> <footer class="pt-5 mt-5 "> <div class="row "> <div class="col-6 col-md-2 mb-3"> <h5>Section</h5> <ul class="nav flex-column "> <li class="nav-item mb-2"><a href="#" class="nav-link p-0 text-light">Home</a></li> <li class="nav-item mb-2"><a href="#" class="nav-link p-0 text-light">Features</a> </li> <li class="nav-item mb-2"><a href="#" class="nav-link p-0 text-light">Pricing</a> </li> <li class="nav-item mb-2"><a href="#" class="nav-link p-0 text-light">FAQs</a></li> <li class="nav-item mb-2"><a href="#" class="nav-link p-0 text-light">About</a> </li> </ul> </div> <div class="col-6 col-md-2 mb-3"> <h5>Section</h5> <ul class="nav flex-column"> <li class="nav-item mb-2"><a href="#" class="nav-link p-0 text-light">Home</a></li> <li class="nav-item mb-2"><a href="#" class="nav-link p-0 text-light">Features</a> </li> <li class="nav-item mb-2"><a href="#" class="nav-link p-0 text-light">Pricing</a> </li> <li class="nav-item mb-2"><a href="#" class="nav-link p-0 text-light">FAQs</a></li> <li class="nav-item mb-2"><a href="#" class="nav-link p-0 text-light">About</a> </li> </ul> </div> <div class="col-6 col-md-2 mb-3"> <h5>Section</h5> <ul class="nav flex-column"> <li class="nav-item mb-2"><a href="#" class="nav-link p-0 text-light">Home</a></li> <li class="nav-item mb-2"><a href="#" class="nav-link p-0 text-light">Features</a> </li> <li class="nav-item mb-2"><a href="#" class="nav-link p-0 text-light">Pricing</a> </li> <li class="nav-item mb-2"><a href="#" class="nav-link p-0 text-light">FAQs</a></li> <li class="nav-item mb-2"><a href="#" class="nav-link p-0 text-light">About</a> </li> </ul> </div> <div class="col-md-5 offset-md-1 mb-3"> <form> <h4> Abone Ol ve Doğanın Güzelliklerini Kaçırma!</h4> <p class="fs-6">Doğanın kucaklayıcı atmosferine adım atmak, huzurla dolu anlar yaşamak ve Enba Camping'in sunduğu özel fırsatları kaçırmamak için hemen abone ol! Sitemize abone olarak, doğanın gizemli güzellikleri, özel indirimler ve etkinliklerden ilk sen haberdar olacaksın.</p> <p class="fs-6"> Unutulmaz anılar biriktirmek ve doğanın kollarında huzurlu bir deneyim yaşamak için abone ol, Enba Camping'in eşsiz dünyasına adımını at! 🏕️✨ </p> <div class="d-flex flex-column flex-sm-row w-100 gap-2"> <label for="newsletter1" class="visually-hidden">Email address</label> <input id="newsletter1" type="text" class="form-control" placeholder="Email address"> <button class="btn btn-primary" type="button">Subscribe</button> </div> </form> </div> </div> <div class="d-flex flex-column flex-sm-row justify-content-between border-top"> <p>© 2023 Company, Inc. All rights reserved.</p> <ul class="list-unstyled d-flex"> <li class="ms-3"><a class="link-body-emphasis" href="#"><svg class="bi" width="24" height="24"> <use xlink:href="#twitter"></use> </svg></a></li> <li class="ms-3"><a class="link-body-emphasis" href="#"><svg class="bi" width="24" height="24"> <use xlink:href="#instagram"></use> </svg></a></li> <li class="ms-3"><a class="link-body-emphasis" href="#"><svg class="bi" width="24" height="24"> <use xlink:href="#facebook"></use> </svg></a></li> </ul> </div> </footer> </div> </div>  </body> </html> 和CSS .jumb { vertical-align: inherit; } p { font-size: 24px; } .c-item { height: 480px; } .c-img { height: 100%; object-fit: cover; filter:brightness(0.9) } 这里。我不希望页面左右移动。我想让它适合全屏，但容器结构溢出了请将这段代码添加到您的 CSS 文件中。然后，它就会起作用。 .row{ margin-right: 0px; }

在React语义ui列表元素中显示奇怪的字符而不是项目符号点

我正在使用react语义ui列表项目符号，但部署后项目符号点显示像奇怪的字符。我已经在 index.html 文件中包含以下代码我正在使用 React 语义 ui 列表项目符号，但部署后项目符号点显示像奇怪的字符。我已经在index.html文件中包含了以下代码 <!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8" /> <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico" /> <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no" /> <meta name="theme-color" content="#000000" /> 我也有这个问题，为什么它们只是偶尔出现，并且不可选，也不属于html？

iPhone 移动视图上的 ReactJS 状态栏为黑色

我查找了解决方案，大多数都是关于 PWA 的，但这是一个静态网页。我尝试添加到我的index.html 文件中，但仍然没有任何内容。在 Safari 和 Chrome 上同样如此我查找了解决方案，大多数都是关于 PWA 的，但这是一个静态网页。我尝试添加到我的index.html 文件中，但仍然没有任何结果。 Safari 和 Chrome 上同样 <meta name='viewport' content='initial-scale=1, viewport-fit=cover'> 这就是我想要实现的目标我希望黑条的颜色和网页一样要更改颜色，请更改 index.html 中的代码 <meta name="theme-color" content="#0d436d" /> 根据您需要的颜色修改内容。

在 Rails 5 中单击浏览器上的后退按钮时，带有 Select2 的表单会重复

_header.html.erb（用于表单部分） <%= form_for home_path, class: 'home', role: 'search', method: :get do |f| %> _header.html.erb（用于表单部分） <%= form_for home_path, class: 'home', role: 'search', method: :get do |f| %> <div class="form-group" style="display:inline;"> <div class="input-group input-group-md"> <%= text_field_tag :q, params[:q], placeholder: ... ,class: 'form-control hideOverflow', type: "search" %> <%= select_tag "category", options_from_collection_for_select(...),include_blank: true, class: 'form-control hideOverflow', type: "search" %> <%if logged_in? %> <%= select_tag "location", options_for_select([...], ...),class: 'form-control hideOverflow', type: "search" %> <% else %> <%= select_tag "location", options_for_select([...], ...),class: 'form-control hideOverflow', include_blank: true, type: "search" %> <% end %> <span class="input-group-addon"><%= submit_tag "Search", class: "btn-transparent"%></span> </div> </div> <% end %> JS代码 <script> $( document ).on('turbolinks:load', function() { $('select#category').select2({ width: '60%', dropdownAutoWidth : true, placeholder: "Choose a category", maximumSelectionLength: 3 }); $('select#location').select2({ width: '40%', dropdownAutoWidth : true, minimumResultsForSearch: Infinity }); }); </script> 故障或渲染问题（单击链接查看图像）有人可以帮我解决为什么吗？另外，我的搜索表单位于标题部分文件的导航栏中。如果我去掉脚本中的 $(...).select ，一切都会正常...我认为 select.js 有问题在此回复： https://stackoverflow.com/a/41915129/5758027 我在自己的代码中使用了这个解决方案： $(document).on('turbolinks:before-cache', function() { // this approach corrects the select 2 to be duplicated when clicking the back button. $('.select-select2').select2('destroy'); $('.select-search-select2').select2('destroy'); } ); 和观察者： $(document).ready( ready ); //... once document ready $(document).ajaxComplete( ready ); //... once ajax is complete $(document).on('turbolinks:load', ready ); //... once a link is clicked function ready() { $(".select-search-select2").select2({ theme: "bootstrap", language: 'es', allowClear: true }); $(".select-select2").select2({ theme: "bootstrap", language: 'es', minimumResultsForSearch: Infinity, allowClear: true }); }; 总是清除缓存不是会让使用 Turbolink 变得毫无意义吗？不如这样？ $(document).on('turbolinks:before-cache', function(e) { return $('.form-control.select2').each(function() { return $(this).select2('destroy'); }); }); 我无法解决这个渲染问题（仍在等待正确的答案！），但如果有人像我一样遇到类似的问题，请尝试跳出框框思考。这是我的技巧：我在应用程序中添加了一个后退按钮。获取完整的url路径 # get the previous url def save_previous_page session[:return_to] = request.fullpath end 仅当页面不是主页或搜索页面时才显示后退按钮 <% if session[:return_to] != request.fullpath%> <%= link_to session.delete(:return_to) || request.fullpath, class: 'back-button' do%> <i class="fa fa-arrow-circle-left" aria-hidden="true"></i> <%end%> <% end %> 同时，我仍在等待并尝试解决渲染问题... 解决了问题只需将此代码添加到您的 .js 文件中 Turbolinks.clearCache(); 这很可能是一些资源不一致，您应该检查您的 app\views\layouts 文件夹中是否有重复声明 wither jQuery、jQuery UJS 或 Turbolinks 的文件。检查页面的所有 <script> 标签，以及是否在 layout 文件夹和内部视图中声明相同的脚本。如果情况并非如此，请检查是否有 render、yield 或 build 呼叫简单的解决方案，不要在您不希望它运行的东西上运行 select2 构建器。 $("select#category:not(.select2-container):not(.select2-hidden-accessible)").select2(); Rails 7 更新这里的很多东西在 Rails 7 中都不起作用，尤其是 turbolinks:before-cache 事件。您正在寻找的新事件是 turbo:before-cache 和 turbo:load，所以它看起来像这样： $(document).on("turbo:before-cache", function() { $("#select_id").select2('destroy'); }); $(document).on('turbo:load', function() { $('#select_id').select2(); });

使用 jquery javascript 搜索 jstree 节点

我正在使用 jstree 插件来构建我的树。我的网页中有一个搜索框，我需要用户能够在其中搜索 jstree 节点。我正在使用 jstree 插件来构建我的树。我的网页中有一个搜索框，我需要用户能够在其中搜索 jstree 节点。 <fieldset id="search"> <input type="text" name="search_field" id="search_field" value="" /> <button id="search_tree">Search</button> </fieldset> 单击搜索时，jstree 节点应展开，如果找到，节点应突出显示。如果未找到，则应向用户显示错误，如“未找到”。我的代码用于展开下面的所有节点。有没有简单的方法来搜索jstree中的所有节点？ <script type="text/javascript"> $(document).ready(function(){ $("#search_tree").click(function () { var value=document.getElementById("search_field").value; $("#tree").jstree("search",value); }); $("#tree").jstree({ "xml_data" : { "ajax" : { "url" : "jstree.xml" }, "xsl" : "nest" }, "themes" : { "theme" : "classic", "dots" : true, "icons" : true }, "search" : { "case_insensitive" : true, "ajax" : { "url" : "jstree.xml" } }, "plugins" : ["themes", "xml_data", "ui","types", "search"] }); }); </script> 我收到此错误： Instances[...] 为 null 或不是对象。这是一个 jstree 错误。有什么想法吗？我已将这段代码添加到我的函数中： "search" : { "case_insensitive" : true, "ajax" : { "url" : "jstree.xml" } }, "plugins" : ["themes", "xml_data", "ui","types", "search"] 和创建了此功能并与我的单击按钮相关联： function myFunction() { $(document).ready(function(){ var value=document.getElementById("search_field").value; $("#search_tree").click(function () { $("#tree").jstree("search",value) }); }); } 2023年，API逐年变化。使用版本v3.3.x，这是我的工作代码：创建jstree实例，配置如下：当您搜索关键字时，请使用：

错误：在此 BlocBuilder<InternetBloc> Widget<InternetBloc, InternetState> 上方找不到正确的提供程序

我在尝试将 flutter_bloc 集成到 flutter 项目中时遇到错误。错误：在此 BlocBuilder 上方找不到正确的 Provider 我在尝试将 flutter_bloc 集成到 flutter 项目中时遇到错误。错误：在此 BlocBuilder Widget 上方找不到正确的提供者这是我正在使用的代码示例。 internet_state.dart abstract class InternetState{} class InitialInternetState extends InternetState{} class LostConnectionInternetState extends InternetState{} class GainConnectionInternetState extends InternetState{} internet_event.dart abstract class InternetEvent{} class LostConnectionEvent extends InternetEvent{} class GainConnectionEvent extends InternetEvent{} internet_bloc.dart class InternetBloc extends Bloc<InternetEvent, InternetState>{ final Connectivity _connectivity = Connectivity(); StreamSubscription? streamSubscription; InternetBloc() : super(InitialInternetState()){ on<GainConnectionEvent>((event, emit) => emit(GainConnectionInternetState())); on<LostConnectionEvent>((event, emit) => emit(LostConnectionInternetState())); _connectivity.onConnectivityChanged.listen((event) { if(event == ConnectivityResult.mobile || event == ConnectivityResult.wifi){ add(GainConnectionEvent()); } else { add(LostConnectionEvent()); } }); } @override Future<void> close() { streamSubscription?.cancel(); return super.close(); } } main.dart class MyApp extends StatelessWidget { const MyApp({super.key}); @override Widget build(BuildContext context) { return MaterialApp( title: 'Flutter Demo', theme: ThemeData( colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple), useMaterial3: true, ), home: const MyHomePage(title: 'Flutter Demo Home Page'), ); } } class MyHomePage extends StatelessWidget { const MyHomePage({super.key, required this.title}); final String title; @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar(title: Text(title),), body: SafeArea( child: Center(child: BlocBuilder<InternetBloc, InternetState>( builder: (context, state) { return const Text("hello"); }, )), ),); } } 我明白了。 ======== 小部件库捕获异常====================================== =================== 构建 MediaQuery(MediaQueryData(size: Size(392.7, 783.3), devicePixelRatio: 2.8, textScaler: noscaling, platformBrightness: Brightness.light, padding: EdgeInsets.zero, viewPadding: EdgeInsets.zero, viewInsets: EdgeInsets 时抛出以下 ProviderNotFoundException。零，systemGestureInsets：EdgeInsets（29.8，24.0，29.8，8.0），alwaysUse24HourFormat：假，accessibleNavigation：假，highContrast：假，onOffSwitchLabels：假，disableAnimations：假，invertColors：假，boldText：假，navigationMode：传统，gestureSettings：DeviceGestureSettings （touchSlop：8.0），显示功能：[]））：错误：无法在此 BlocBuilder Widget 之上找到正确的提供程序发生这种情况是因为您使用了不包含提供程序的 BuildContext 你的选择。有以下几种常见场景：您在main.dart中添加了一个新的提供程序并执行了热重载。要修复此问题，请执行热重启。您尝试阅读的提供商处于不同的路线。提供商具有“范围”。因此，如果您在路线中插入提供者，那么其他路线将无法访问该提供商。您使用了 BuildContext，它是您尝试读取的提供程序的祖先。确保 BlocBuilder 位于您的 MultiProvider/Provider 下。当您创建提供程序并尝试立即读取它时，通常会发生这种情况。例如，代替： Widget build(BuildContext context) { return Provider<Example>( create: (_) => Example(), // Will throw a ProviderNotFoundError, because `context` is associated // to the widget that is the parent of `Provider<Example>` child: Text(context.watch<Example>().toString()), ); } 考虑使用builder，如下所示： Widget build(BuildContext context) { return Provider<Example>( create: (_) => Example(), // we use `builder` to obtain a new `BuildContext` that has access to the provider builder: (context, child) { // No longer throws return Text(context.watch<Example>().toString()); } ); } 如果这些解决方案都不起作用，请考虑在 StackOverflow 上寻求帮助： https://stackoverflow.com/questions/tagged/flutter The relevant error-causing widget was: SafeArea SafeArea:file:///Users/../Projects/flutterTest/bloc_test/lib/main.dart:37:13 When the exception was thrown, this was the stack: #0 Provider._inheritedElementOf (package:provider/src/provider.dart:343:7) #1 Provider.of (package:provider/src/provider.dart:293:30) #2 ReadContext.read (package:provider/src/provider.dart:649:21) #3 _BlocBuilderBaseState.initState (package:flutter_bloc/src/bloc_builder.dart:130:36) #4 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:5602:55) #5 ComponentElement.mount (package:flutter/src/widgets/framework.dart:5447:5) ... Normal element mounting (4 frames) #9 Element.inflateWidget (package:flutter/src/widgets/framework.dart:4326:16) #10 Element.updateChild (package:flutter/src/widgets/framework.dart:3831:20) #11 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #12 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #13 ProxyElement.update (package:flutter/src/widgets/framework.dart:5800:5) #14 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #15 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6743:14) #16 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #17 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #18 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #19 StatelessElement.update (package:flutter/src/widgets/framework.dart:5547:5) #20 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #21 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #22 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #23 StatelessElement.update (package:flutter/src/widgets/framework.dart:5547:5) #24 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #25 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #26 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #27 StatelessElement.update (package:flutter/src/widgets/framework.dart:5547:5) #28 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #29 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #30 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #31 ProxyElement.update (package:flutter/src/widgets/framework.dart:5800:5) #32 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #33 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #34 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #35 ProxyElement.update (package:flutter/src/widgets/framework.dart:5800:5) #36 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #37 Element.updateChildren (package:flutter/src/widgets/framework.dart:3964:32) #38 MultiChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6896:17) #39 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #40 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #41 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #42 ProxyElement.update (package:flutter/src/widgets/framework.dart:5800:5) #43 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #44 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #45 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5634:11) #46 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #47 StatefulElement.update (package:flutter/src/widgets/framework.dart:5657:5) #48 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #49 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #50 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5634:11) #51 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #52 StatefulElement.update (package:flutter/src/widgets/framework.dart:5657:5) #53 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #54 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #55 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #56 ProxyElement.update (package:flutter/src/widgets/framework.dart:5800:5) #57 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #58 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #59 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5634:11) #60 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #61 StatefulElement.update (package:flutter/src/widgets/framework.dart:5657:5) #62 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #63 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6743:14) #64 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #65 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #66 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #67 ProxyElement.update (package:flutter/src/widgets/framework.dart:5800:5) #68 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #69 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6743:14) #70 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #71 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #72 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5634:11) #73 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #74 StatefulElement.update (package:flutter/src/widgets/framework.dart:5657:5) #75 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #76 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #77 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5634:11) #78 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #79 StatefulElement.update (package:flutter/src/widgets/framework.dart:5657:5) #80 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #81 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #82 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #83 ProxyElement.update (package:flutter/src/widgets/framework.dart:5800:5) #84 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #85 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #86 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #87 ProxyElement.update (package:flutter/src/widgets/framework.dart:5800:5) #88 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #89 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #90 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #91 ProxyElement.update (package:flutter/src/widgets/framework.dart:5800:5) #92 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #93 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #94 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5634:11) #95 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #96 StatefulElement.update (package:flutter/src/widgets/framework.dart:5657:5) #97 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #98 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #99 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #100 ProxyElement.update (package:flutter/src/widgets/framework.dart:5800:5) #101 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #102 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #103 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5634:11) #104 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #105 StatefulElement.update (package:flutter/src/widgets/framework.dart:5657:5) #106 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #107 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #108 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #109 BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2895:19) #110 WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:984:21) #111 RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:457:5) #112 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1325:15) #113 SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1255:9) #114 SchedulerBinding.scheduleWarmUpFrame.<anonymous closure> (package:flutter/src/scheduler/binding.dart:978:7) #118 _RawReceivePort._handleMessage (dart:isolate-patch/isolate_patch.dart:184:12) (elided 3 frames from class _Timer and dart:async-patch) ==================================================================================================== 我不想使用像 MultiProvider 这样的全局提供程序。您应该在某处创建 InternetBloc 并提供它。 MultiProvider 本身并不是全局的，它只是多个。更多信息在这里：https://bloclibrary.dev/#/flutterbloccoreconcepts?id=blocprovider 所以，如果您不想使用全局提供程序，它将看起来像这样： class MyHomePage extends StatelessWidget { const MyHomePage({super.key, required this.title}); final String title; @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text(title), ), body: SafeArea( child: Center( child: BlocProvider<InternetBloc>( create: ( context) => InternetBloc(), child: BlocBuilder<InternetBloc, InternetState>( builder: (context, state) { return const Text("hello"); }, ), ), ), ), ); } } 要使用 BlocBuilder，您需要在 Widget 树中放置一个 BlocProvider。最佳实践是将其放置得尽可能深。在您的情况下，只需将 BlocProvider 放在 BlocBuilder 之上。此外 MultiProvider / MultiBlocProvider 不是全局 Provider。它只是一个提供多个 Provider/BlocProvider 的便捷小部件。 class MyHomePage extends StatelessWidget { const MyHomePage({super.key, required this.title}); final String title; @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text(title), ), body: SafeArea( child: Center( // Now everything below that can access the InternetBloc child: BlocProvider<InternetBloc>( create: (_) => InternetBloc(), child: BlocBuilder<InternetBloc, InternetState>( builder: (context, state) { return const Text("hello"); }, ), ), ), ), ); } }

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