html - CSS图像最大高度不保持纵横比

Question

Video preview
我有一个弹出模式，它的位置固定，宽度和高度为 100%。
modal里面的内容有max-width: 90%;和 max-height: 90%图像也有这些值，但问题是它在改变高度时不保持纵横比，但在改变宽度时却保持纵横比。 (视频说明了一切)

#popup {
  display: flex;
  justify-content: center;
  align-items: center;
  position: fixed;
  top: 0;
  bottom: 0;
  opacity: 1;
  background: rgba(0, 0, 0, 0.5);
  width: 100%;
  height: 100%;
}

.popupModal {
  max-width: 90%;
  max-height: 90%;
  background: linear-gradient(0deg, #fff, #f0f0f0);
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  transform: translateY(-100px);
  transition: transform 0.5s;
}

.closeBtn {
  position: absolute;
  top: -25px;
  right: -25px;
  border-radius: 50%;
  background-color: #fff;
  font-size: 24px;
  font-weight: bold;
  color: $blue-dark;
  height: 50px;
  width: 50px;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  -webkit-box-shadow: 0 0 27px -10px rgba(0, 0, 0, 0.95);
  -moz-box-shadow: 0 0 27px -10px rgba(0, 0, 0, 0.95);
  box-shadow: 0 0 27px -10px rgba(0, 0, 0, 0.95);
  transition: box-shadow 0.2s ease;
}

.closeLine {
  position: absolute;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;
  margin: auto;
  background-color: #072742;
  height: 4px;
  width: 50%;
}

#closeLineOne {
  transform: rotate(45deg);
}

#closeLineTwo {
  transform: rotate(135deg);
}

.closeLine:hover {
  -webkit-box-shadow: none;
  -moz-box-shadow: none;
  box-shadow: none;
}

.popupActive {
  opacity: 1;
  z-index: 5000;
  transition: z-index 0s 0s, opacity 0.5s 0s;
}

.popupModal {
  transform: translateY(0);
}

.metalModal {
  height: 80%;
  background: transparent;
}

.metalPopup {
  display: flex;
  flex-direction: column;
  // It works if I change the max-height to height, but it then stretches out all other images.
  max-height: 100%;
  max-width: 100%;
  position: relative;
}

.metalImg {
  max-width: 100%;
  flex: 1;
  object-fit: cover;
  max-height: 100%;
  width: auto;
  height: auto;
}

.metalName {
  width: 100%;
  height: 70px;
  display: flex;
  justify-content: center;
  align-items: center;
  font-weight: bold;
  color: white;
  font-size: 24px;
  background-color: rgba(0, 0, 0, 0.75);
  position: absolute;
  bottom: 0;
  left: 0;
}

<div id="popup" class="popupActive">
  <div class="popupModal metalModal">
    <div class="metalPopup">
      <div class="closeBtn">
        <span id="closeLineOne" class="closeLine"></span>
        <span id="closeLineTwo" class="closeLine"></span>
      </div>
      <img src="https://i.imgur.com/BeWSEDB.jpg" class="metalImg" />
      <div class="metalName">
        Metal name
      </div>
    </div>
  </div>
</div>

编辑:
当我给出 .metalPopup 时，图像保持纵横比类(class) display: block .但它使宽度保持原来的 img宽度，即使图像是整个 block 的一小部分。
^ See here .

Answer 1

所以我就改了.metalPopup最大高度为 height: 100%;它现在似乎可以工作并且不会拉伸(stretch)图像，因为 .metalImg现在有 max-height 删除 .metalName 的高度(现在是 position: relative ，因为如果我愿意，它不会响应地使模态居中，但仍然可以添加到相对定位并减去它的高度)。

#popup {
  display: flex;
  justify-content: center;
  align-items: center;
  position: fixed;
  top: 0;
  bottom: 0;
  opacity: 1;
  background: rgba(0, 0, 0, 0.5);
  width: 100%;
  height: 100%;
}

.popupModal {
  max-width: 90%;
  max-height: 90%;
  background: linear-gradient(0deg, #fff, #f0f0f0);
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  transform: translateY(-100px);
  transition: transform 0.5s;
}

.closeBtn {
  position: relative;
  top: 25px;
  margin: 0 0 0 auto;
  right: -25px;
  border-radius: 50%;
  background-color: #fff;
  font-size: 24px;
  font-weight: bold;
  color: $blue-dark;
  height: 50px;
  width: 50px;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  -webkit-box-shadow: 0 0 27px -10px rgba(0, 0, 0, 0.95);
  -moz-box-shadow: 0 0 27px -10px rgba(0, 0, 0, 0.95);
  box-shadow: 0 0 27px -10px rgba(0, 0, 0, 0.95);
  transition: box-shadow 0.2s ease;
}

.closeLine {
  position: absolute;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;
  margin: auto;
  background-color: #072742;
  height: 4px;
  width: 50%;
}

#closeLineOne {
  transform: rotate(45deg);
}

#closeLineTwo {
  transform: rotate(135deg);
}

.closeLine:hover {
  -webkit-box-shadow: none;
  -moz-box-shadow: none;
  box-shadow: none;
}

.popupActive {
  opacity: 1;
  z-index: 5000;
  transition: z-index 0s 0s, opacity 0.5s 0s;
}

.popupModal {
  transform: translateY(0);
}

.metalModal {
  height: 80%;
  background: transparent;
}

.metalPopup {
  display: flex;
  flex-direction: column;
  height: 100%;
  max-width: 100%;
  position: relative;
}

.metalImg {
  max-width: 100%;
  object-fit: cover;
  max-height: calc(100% - 130px);
}

.metalName {
  width: 100%;
  height: 70px;
  display: flex;
  justify-content: center;
  align-items: center;
  font-weight: bold;
  color: white;
  font-size: 24px;
  background-color: rgba(0, 0, 0, 0.75);
}

<div id="popup" class="popupActive">
  <div class="popupModal metalModal">
    <div class="metalPopup">
      <div class="closeBtn">
        <span id="closeLineOne" class="closeLine"></span>
        <span id="closeLineTwo" class="closeLine"></span>
      </div>
      <img src="https://i.imgur.com/BeWSEDB.jpg" class="metalImg" />
      <div class="metalName">
        Metal name
      </div>
    </div>
  </div>
</div>