首页 \ 问答 \ 如何为水平图像视图的自动布局正确设置约束？(How to properly set constrains for Auto layout for horizontal image views?)

如何为水平图像视图的自动布局正确设置约束？(How to properly set constrains for Auto layout for horizontal image views?)

我遇到了自动布局的问题。 更具体地说，当您有一个相当复杂（或可能是紧凑）的布局时，我对自动布局的工作原理感到困惑。 当我尝试进行水平布局时，我甚至都没有成功过。 例如，我尝试在故事板中水平设置两个标签，无论我做什么，在实际设备上检查它时都是热点。
所以这一次，我的噩梦又来了。 这里的截图是我在故事板中设置的视图。 我正在使用自动布局，所以我必须添加约束，我首先要做的是为第一个图像视图添加顶部空间约束（左上角），它告诉我视图不明确。 这似乎不对，因为在这样的情况下，Xcode总是告诉我图像视图需要斧头位置。 但这一次它“含糊不清”。 我尝试了很多东西，但无论如何都没有锻炼。 我放弃了手动设置，而是让Xcode为我做，我点击“重置为建议的约束”，然后设置相等的宽度和高度，然后将图像视图设置为1：1方面无线电。 但是在预览时，它仍然是一个热点。
显然，我和Xcode都不能像我们预期的那样设置布局。 这就是为什么我来这里问你们，让我为你解释一下我的担忧：1。我应该为所有图像视图设置什么约束？ 2.我应该为“主题”设置什么约束？ 3.我应该为标签设置什么约束（主题下面的描述）？
提前致谢。

I am experiencing an issue with auto layout. More specifically, I am confused by how Auto Layout works when you have a rather complex(or maybe compact) layout. I never even succeed once when I tried to do a horizontal layout. For example, I tried to set two labels horizontally in storyboard before, no matter what I do, it's hot mess when checking it on an actual device.
So this time, my nightmare comes again. The screenshot here is the view I set up in the storyboard. I am using auto layout, so I must add constrains, what I did first is add a top space constrain for the first image view(top left), and it told me views are ambiguous. That doesn't seem right, because in circumstances like these, Xcode always tell me the image view needs a x position. But this time it's "ambiguous". And I tried many things, it didn't workout anyway. I gave up setting up manually, instead I ask the Xcode to do it for me, I tapped "reset to suggested constrains", and then set equal width and height, and then set the image views to 1:1 aspect radio. But when previewing, it's still a hot mess.
So apparently, neither me nor Xcode could set up the layout behaved just as expected. That's why I come here and ask you guys, let's me break it down for you about my concerns: 1. What constrains should I set for all the image views? 2. What constrains should I set for "topic"? 3. What constrains should I set for the label (description below the topic)?
Thanks in advance.

原文：https://stackoverflow.com/questions/38930616

更新时间：2022-08-23 22:08

最满意答案

 纯CSS方法：  
 您可以使用按钮的属性来检测导航栏是否在较小的屏幕中折叠或展开。  
 
 
  
  @media (max-width: 768px) {
  button[aria-expanded="true"] ~ .navbar-brand.expanded-logo {
    display: block; /* If aria-expanded is set to true, show the logo for expanded state */
  }
  button[aria-expanded="false"] ~ .navbar-brand.collapsed-logo {
    display: block; /* If aria-expanded is set to false, show the logo for collapsed state */
  }
  button[aria-expanded="true"] ~ .navbar-brand.collapsed-logo {
    display: none; /* Hide the collapsed state logo when the expanded state logo is shown */
  }
}
.expanded-logo {
  display: none; /* Show only one logo on larger screen, hide logo by default */
} 
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/css/bootstrap.min.css" rel="stylesheet" />
<div data-example-id="navbar-static-top" class="bs-example bs-navbar-top-example">
  <nav class="navbar navbar-default navbar-static-top">
    <!-- We use the fluid option here to avoid overriding the fixed width of a normal container within the narrow content columns. -->
    <div class="container-fluid">
      <div class="navbar-header">
        <button aria-expanded="false" data-target="#bs-example-navbar-collapse-8" data-toggle="collapse" class="navbar-toggle collapsed" type="button">
          <span class="sr-only">Toggle navigation</span>
          <span class="icon-bar"></span>
          <span class="icon-bar"></span>
          <span class="icon-bar"></span>
        </button>
        <a href="#" class="navbar-brand collapsed-logo">
          <img src="http://placehold.it/30x30/333">
        </a>
        <a href="#" class="navbar-brand expanded-logo">
          <img src="http://placehold.it/30x30/666">
        </a>
      </div>

      <!-- Collect the nav links, forms, and other content for toggling -->
      <div id="bs-example-navbar-collapse-8" class="collapse navbar-collapse">
        <ul class="nav navbar-nav">
          <li class="active"><a href="#">Home</a>
          </li>
          <li><a href="#">Link</a>
          </li>
          <li><a href="#">Link</a>
          </li>
        </ul>
      </div>
      <!-- /.navbar-collapse -->
    </div>
  </nav>
</div> 
  
 

Pure CSS approach: 
You can use the attributes of the button to detect if the navbar is collapsed or expanded in smaller screens. 
 
 
  
  @media (max-width: 768px) {
  button[aria-expanded="true"] ~ .navbar-brand.expanded-logo {
    display: block; /* If aria-expanded is set to true, show the logo for expanded state */
  }
  button[aria-expanded="false"] ~ .navbar-brand.collapsed-logo {
    display: block; /* If aria-expanded is set to false, show the logo for collapsed state */
  }
  button[aria-expanded="true"] ~ .navbar-brand.collapsed-logo {
    display: none; /* Hide the collapsed state logo when the expanded state logo is shown */
  }
}
.expanded-logo {
  display: none; /* Show only one logo on larger screen, hide logo by default */
} 
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/css/bootstrap.min.css" rel="stylesheet" />
<div data-example-id="navbar-static-top" class="bs-example bs-navbar-top-example">
  <nav class="navbar navbar-default navbar-static-top">
    <!-- We use the fluid option here to avoid overriding the fixed width of a normal container within the narrow content columns. -->
    <div class="container-fluid">
      <div class="navbar-header">
        <button aria-expanded="false" data-target="#bs-example-navbar-collapse-8" data-toggle="collapse" class="navbar-toggle collapsed" type="button">
          <span class="sr-only">Toggle navigation</span>
          <span class="icon-bar"></span>
          <span class="icon-bar"></span>
          <span class="icon-bar"></span>
        </button>
        <a href="#" class="navbar-brand collapsed-logo">
          <img src="http://placehold.it/30x30/333">
        </a>
        <a href="#" class="navbar-brand expanded-logo">
          <img src="http://placehold.it/30x30/666">
        </a>
      </div>

      <!-- Collect the nav links, forms, and other content for toggling -->
      <div id="bs-example-navbar-collapse-8" class="collapse navbar-collapse">
        <ul class="nav navbar-nav">
          <li class="active"><a href="#">Home</a>
          </li>
          <li><a href="#">Link</a>
          </li>
          <li><a href="#">Link</a>
          </li>
        </ul>
      </div>
      <!-- /.navbar-collapse -->
    </div>
  </nav>
</div>

如何为水平图像视图的自动布局正确设置约束？(How to properly set constrains for Auto layout for horizontal image views?)

最满意答案

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