Bootstrap 4 张垂直居中 - 等高卡片

Question

我正在使用 Bootstrap 4 alpha 6，并尝试使用 flexbox 将等高卡片的内容垂直居中。我使用 h-100 util class 使卡片的列全高..

问题是我想让每张卡片的内容居中对齐（垂直居中）。我尝试在行中使用 .align-items-center class，这可以使卡片居中，但卡片不再等高...

HTML

<div class="container">
    <div class="row align-items-center bg-faded">
        <div class="col-md-2">
            <div class="card card-block h-100">
                I have a lot of content that wraps on multiple lines..
            </div>
        </div>
        <div class="col-md-6">
            <div class="card card-block h-100">
               I have a line of content.<br>
               And another line here..
            </div>
        </div>
        <div class="col-md-4">
            <div class="card card-block h-100">
                I have a little bit.
            </div>
        </div>
    </div>
</div>

Demo of problem

Answer 1

我发现解决居中问题的一种方法是使用 flex-column 实用程序 class。由于每张牌都是display: flex，所以可以用flex-column来套flex-direction: column。然后，justify-content-center 垂直对齐内容...

<div class="container">
    <div class="row">
        <div class="col-md-2">
            <div class="card card-block h-100 flex-column justify-content-center">
                I have a lot of content that wraps on multiple lines..
            </div>
        </div>
        <div class="col-md-6">
            <div class="card card-block h-100 flex-column justify-content-center">
               I have a line of content.<br>
               And another line here..
            </div>
        </div>
        <div class="col-md-4">
            <div class="card card-block h-100 flex-column justify-content-center">
                I have a little bit.
            </div>
        </div>
    </div>
</div>

Demo

Answer 2

这里有一个更简单的解决方案：

仅使用 justify-content-center 实用程序 class 因为 .card 已经 flex-direction: column 属性

<link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" rel="stylesheet"/>
<div class="container">
    <code>normal .row with .card inside .col-*</code>
    <h6>Problem is that card content is not centered</h6>
    <div class="row bg-faded">
        <div class="col-md-2">
            <div class="card card-block h-100 justify-content-center align-items-center">
                I have a lot of content that wraps on multiple lines..
            </div>
        </div>
        <div class="col-md-6">
            <div class="card card-block h-100 justify-content-center align-items-center">
               I have a line of content.<br>
               And another line here..
            </div>
        </div>
        <div class="col-md-4">
            <div class="card card-block h-100 justify-content-center align-items-center">
                I have a little bit.
            </div>
        </div>
    </div>
</div>
<hr>
<div class="container">
    <code>.align-items-center.row with .card inside .col-</code>
    <h6>Problem is that cards are no longer full height</h6>
   <div class="row bg-faded">
        <div class="col-md-2">
            <div class="card card-block h-100 justify-content-center">
                I have a lot of content that wraps on multiple lines..
            </div>
        </div>
        <div class="col-md-6">
            <div class="card card-block h-100 justify-content-center">
               I have a line of content.<br>
               And another line here..
            </div>
        </div>
        <div class="col-md-4">
            <div class="card card-block h-100 justify-content-center">
                I have a little bit.
            </div>
        </div>
    </div>
</div>

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