这是我在 Symfony 中的第一个项目，我只是创建了一个带有渲染功能的新控制器“Homecontroller”：
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\Annotation\Route;
class HomeController extends AbstractController
{
/**
* @Route("/", name="home")
*/
public function index(): Response
{
return $this->render('index.html.twig');
}
}
所以这个函数捕获我的 index.html.twig 文件，在其中，我只有这一行。
我的 index.html.twig :
{% extends "base.html.twig" %}
我的 base.html.twig :
<!doctype html>
<html lang="fr">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<meta name="description" content="">
<meta name="author" content="Mark Otto, Jacob Thornton, and Bootstrap contributors">
<meta name="generator" content="Jekyll v4.1.1">
<title>Carousel Template · Bootstrap</title>
<!-- Bootstrap core CSS -->
<link href="bootstrap.css" rel="stylesheet">
<style>
.bd-placeholder-img {
font-size: 1.125rem;
text-anchor: middle;
-webkit-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
user-select: none;
}
@media (min-width: 768px) {
.bd-placeholder-img-lg {
font-size: 3.5rem;
}
}
</style>
<!-- Custom styles for this template -->
<link href="carousel.css" rel="stylesheet">
</head>
<body>
<header>
<nav class="navbar navbar-expand-md navbar-dark fixed-top bg-dark">
<a class="navbar-brand" href="#">Carousel</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarCollapse" aria-controls="navbarCollapse" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarCollapse">
<ul class="navbar-nav mr-auto">
<li class="nav-item active">
<a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#" tabindex="-1" aria-disabled="true">Disabled</a>
</li>
</ul>
<form class="form-inline mt-2 mt-md-0">
<input class="form-control mr-sm-2" type="text" placeholder="Search" aria-label="Search">
<button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
</form>
</div>
</nav>
</header>
<main role="main">
<div id="myCarousel" class="carousel slide" data-ride="carousel">
<ol class="carousel-indicators">
<li data-target="#myCarousel" data-slide-to="0" class="active"></li>
<li data-target="#myCarousel" data-slide-to="1"></li>
<li data-target="#myCarousel" data-slide-to="2"></li>
</ol>
<div class="carousel-inner">
<div class="carousel-item active">
<svg class="bd-placeholder-img" width="100%" height="100%" xmlns="http://www.w3.org/2000/svg" preserveAspectRatio="xMidYMid slice" focusable="false" role="img"><rect width="100%" height="100%" fill="#777"/></svg>
<div class="container">
<div class="carousel-caption text-left">
<h1>Example headline.</h1>
<p>Cras justo odio, dapibus ac facilisis in, egestas eget quam. Donec id elit non mi porta gravida at eget metus. Nullam id dolor id nibh ultricies vehicula ut id elit.</p>
<p><a class="btn btn-lg btn-primary" href="#" role="button">Sign up today</a></p>
</div>
</div>
</div>
<div class="carousel-item">
<svg class="bd-placeholder-img" width="100%" height="100%" xmlns="http://www.w3.org/2000/svg" preserveAspectRatio="xMidYMid slice" focusable="false" role="img"><rect width="100%" height="100%" fill="#777"/></svg>
<div class="container">
<div class="carousel-caption">
<h1>Another example headline.</h1>
<p>Cras justo odio, dapibus ac facilisis in, egestas eget quam. Donec id elit non mi porta gravida at eget metus. Nullam id dolor id nibh ultricies vehicula ut id elit.</p>
<p><a class="btn btn-lg btn-primary" href="#" role="button">Learn more</a></p>
</div>
</div>
</div>
<div class="carousel-item">
<svg class="bd-placeholder-img" width="100%" height="100%" xmlns="http://www.w3.org/2000/svg" preserveAspectRatio="xMidYMid slice" focusable="false" role="img"><rect width="100%" height="100%" fill="#777"/></svg>
<div class="container">
<div class="carousel-caption text-right">
<h1>One more for good measure.</h1>
<p>Cras justo odio, dapibus ac facilisis in, egestas eget quam. Donec id elit non mi porta gravida at eget metus. Nullam id dolor id nibh ultricies vehicula ut id elit.</p>
<p><a class="btn btn-lg btn-primary" href="#" role="button">Browse gallery</a></p>
</div>
</div>
</div>
</div>
<a class="carousel-control-prev" href="#myCarousel" role="button" data-slide="prev">
<span class="carousel-control-prev-icon" aria-hidden="true"></span>
<span class="sr-only">Previous</span>
</a>
<a class="carousel-control-next" href="#myCarousel" role="button" data-slide="next">
<span class="carousel-control-next-icon" aria-hidden="true"></span>
<span class="sr-only">Next</span>
</a>
</div>
<!-- Marketing messaging and featurettes
================================================== -->
<!-- Wrap the rest of the page in another container to center all the content. -->
<div class="container marketing">
<!-- Three columns of text below the carousel -->
<div class="row">
<div class="col-lg-4">
<svg class="bd-placeholder-img rounded-circle" width="140" height="140" xmlns="http://www.w3.org/2000/svg" preserveAspectRatio="xMidYMid slice" focusable="false" role="img" aria-label="Placeholder: 140x140"><title>Placeholder</title><rect width="100%" height="100%" fill="#777"/><text x="50%" y="50%" fill="#777" dy=".3em">140x140</text></svg>
<h2>Heading</h2>
<p>Donec sed odio dui. Etiam porta sem malesuada magna mollis euismod. Nullam id dolor id nibh ultricies vehicula ut id elit. Morbi leo risus, porta ac consectetur ac, vestibulum at eros. Praesent commodo cursus magna.</p>
<p><a class="btn btn-secondary" href="#" role="button">View details »</a></p>
</div><!-- /.col-lg-4 -->
<div class="col-lg-4">
<svg class="bd-placeholder-img rounded-circle" width="140" height="140" xmlns="http://www.w3.org/2000/svg" preserveAspectRatio="xMidYMid slice" focusable="false" role="img" aria-label="Placeholder: 140x140"><title>Placeholder</title><rect width="100%" height="100%" fill="#777"/><text x="50%" y="50%" fill="#777" dy=".3em">140x140</text></svg>
<h2>Heading</h2>
<p>Duis mollis, est non commodo luctus, nisi erat porttitor ligula, eget lacinia odio sem nec elit. Cras mattis consectetur purus sit amet fermentum. Fusce dapibus, tellus ac cursus commodo, tortor mauris condimentum nibh.</p>
<p><a class="btn btn-secondary" href="#" role="button">View details »</a></p>
</div><!-- /.col-lg-4 -->
<div class="col-lg-4">
<svg class="bd-placeholder-img rounded-circle" width="140" height="140" xmlns="http://www.w3.org/2000/svg" preserveAspectRatio="xMidYMid slice" focusable="false" role="img" aria-label="Placeholder: 140x140"><title>Placeholder</title><rect width="100%" height="100%" fill="#777"/><text x="50%" y="50%" fill="#777" dy=".3em">140x140</text></svg>
<h2>Heading</h2>
<p>Donec sed odio dui. Cras justo odio, dapibus ac facilisis in, egestas eget quam. Vestibulum id ligula porta felis euismod semper. Fusce dapibus, tellus ac cursus commodo, tortor mauris condimentum nibh, ut fermentum massa justo sit amet risus.</p>
<p><a class="btn btn-secondary" href="#" role="button">View details »</a></p>
</div><!-- /.col-lg-4 -->
</div><!-- /.row -->
<!-- START THE FEATURETTES -->
<hr class="featurette-divider">
<div class="row featurette">
<div class="col-md-7">
<h2 class="featurette-heading">First featurette heading. <span class="text-muted">It’ll blow your mind.</span></h2>
<p class="lead">Donec ullamcorper nulla non metus auctor fringilla. Vestibulum id ligula porta felis euismod semper. Praesent commodo cursus magna, vel scelerisque nisl consectetur. Fusce dapibus, tellus ac cursus commodo.</p>
</div>
<div class="col-md-5">
<svg class="bd-placeholder-img bd-placeholder-img-lg featurette-image img-fluid mx-auto" width="500" height="500" xmlns="http://www.w3.org/2000/svg" preserveAspectRatio="xMidYMid slice" focusable="false" role="img" aria-label="Placeholder: 500x500"><title>Placeholder</title><rect width="100%" height="100%" fill="#eee"/><text x="50%" y="50%" fill="#aaa" dy=".3em">500x500</text></svg>
</div>
</div>
<hr class="featurette-divider">
<div class="row featurette">
<div class="col-md-7 order-md-2">
<h2 class="featurette-heading">Oh yeah, it’s that good. <span class="text-muted">See for yourself.</span></h2>
<p class="lead">Donec ullamcorper nulla non metus auctor fringilla. Vestibulum id ligula porta felis euismod semper. Praesent commodo cursus magna, vel scelerisque nisl consectetur. Fusce dapibus, tellus ac cursus commodo.</p>
</div>
<div class="col-md-5 order-md-1">
<svg class="bd-placeholder-img bd-placeholder-img-lg featurette-image img-fluid mx-auto" width="500" height="500" xmlns="http://www.w3.org/2000/svg" preserveAspectRatio="xMidYMid slice" focusable="false" role="img" aria-label="Placeholder: 500x500"><title>Placeholder</title><rect width="100%" height="100%" fill="#eee"/><text x="50%" y="50%" fill="#aaa" dy=".3em">500x500</text></svg>
</div>
</div>
<hr class="featurette-divider">
<div class="row featurette">
<div class="col-md-7">
<h2 class="featurette-heading">And lastly, this one. <span class="text-muted">Checkmate.</span></h2>
<p class="lead">Donec ullamcorper nulla non metus auctor fringilla. Vestibulum id ligula porta felis euismod semper. Praesent commodo cursus magna, vel scelerisque nisl consectetur. Fusce dapibus, tellus ac cursus commodo.</p>
</div>
<div class="col-md-5">
<svg class="bd-placeholder-img bd-placeholder-img-lg featurette-image img-fluid mx-auto" width="500" height="500" xmlns="http://www.w3.org/2000/svg" preserveAspectRatio="xMidYMid slice" focusable="false" role="img" aria-label="Placeholder: 500x500"><title>Placeholder</title><rect width="100%" height="100%" fill="#eee"/><text x="50%" y="50%" fill="#aaa" dy=".3em">500x500</text></svg>
</div>
</div>
<hr class="featurette-divider">
<!-- /END THE FEATURETTES -->
</div><!-- /.container -->
<!-- FOOTER -->
<footer class="container">
<p class="float-right"><a href="#">Back to top</a></p>
<p>© 2017-2020 Company, Inc. · <a href="#">Privacy</a> · <a href="#">Terms</a></p>
</footer>
</main>
<script src="https://code.jquery.com/jquery-3.5.1.slim.min.js"></script>
<script src="bootstrap.bundle.js"></script>
</body>
</html>
当我只想显示我的 base.html.twig 时，为什么我有一个空白页面？ 我想这是一个块或内容问题，但我卡住了......
答案 0 :(得分：0)
据我所知，您的 base.html.twig 没有扩展点。
您需要在 base.html.twig 中像这样定义块：
{% block main %}{% endblock %}
然后在您的 index.html.twig 中：
{% extends "base.html.twig" %}
{% block main %}
{# your page contents here #}
{% endblock %}