Question

我正在尝试创建导航栏，该导航栏的左侧是一个汉堡，图标居中。我该如何快速地做到这一点？

我尝试使用mx-auto（左边距margin-right：auto），但是由于我在左侧有一个内联块，因此居中的图标被推到左侧。
我也尝试过制作导航栏d-flex并添加justify-content-center，但是它什么也没做...

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
<div class="pos-f-t">
  <nav id="navbar" class="navbar navbar-expand-sm fixed-top navbar-dark bg-dark d-flex flex-row">
    <button class="navbar-toggler d-flex justify-content-start" type="button">
        <span class="navbar-toggler-icon"></span>
    </button>
    <img src="https://picsum.photos/20" alt="apple icon" class="d-flex justify-content-center mx-auto" id="icon">

  </nav>
</div>

预期结果： -汉堡保持左，但苹果图标保持居中。

实际结果： -汉堡稍微向右推苹果图标， -或什么都没有改变，只是坐在右侧。

Answer 1

刘易斯，您的代码运行正常。我刚刚添加了bootstrap4 CSS文件。下面是我的代码。

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" />
<div class="pos-f-t">
        <nav
          id="navbar"
          class="navbar navbar-expand-sm fixed-top navbar-dark bg-dark d-flex flex-row"
        >
          <button class="navbar-toggler d-flex justify-content-start" type="button">
            <span class="navbar-toggler-icon"></span>
          </button>
          <img
            src="http://www.newdesignfile.com/postpic/2012/09/small-apple-logo_154074.jpg"
            alt="apple icon"
            class="d-flex justify-content-center mx-auto"
            id="icon"
            width="50px"
          />
        </nav>
</div>

Answer 2

这与您上面的代码完美配合。检查以下屏幕截图。

确保已添加bootstrap4 css文件

Answer 3

您可以在此处添加等于导航栏切换按钮的宽度（宽度= 56像素）的右侧填充到导航栏。它已经有一个16px的右填充。因此，我们的总填充应为16px + 56px = 72px。

这将使图像精确对准导航栏的中心。

.navbar-fix {
  padding-right: 72px !important;
}

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
<div class="pos-f-t">
  <nav id="navbar" class="navbar navbar-expand-sm fixed-top navbar-dark bg-dark d-flex flex-row navbar-fix">
    <button class="navbar-toggler d-flex justify-content-start" type="button">
        <span class="navbar-toggler-icon"></span>
    </button>
    <img src="https://picsum.photos/20" alt="apple icon" class="d-flex justify-content-center mx-auto" id="icon">

  </nav>
</div>

如何使用引导程序将图标在导航栏中居中

3 个答案: