ios多个animation动画执行使用rotateY旋转重叠问题
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问题背景
在ios上面，做了两个动画，都是使用animation，一个动画盖在另外一个动画上面，然后把下面的动画一直在旋转，上面的绕Y轴旋转，在ios上面就会有一半的动画卡进去，可以看下这个效果
这是代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
.test-card
display: flex;
flex-direction: column;
align-items: center;
position: absolute;
z-index: 14;
top: 50%;
left: 50%;
width: rem(560);
transform: translateX(-50%) translateY(-50%) translateZ(1px);
background-size: 100% 100%;
animation-name: test-card;
animation-delay: 1s;
animation-duration: 1s;
animation-timing-function: linear;
animation-iteration-count: 0.99;
animation-fill-mode: forwards;
.test-end
position: absolute;
z-index: 1;
top: 50vh;
left: 50vw;
transform: translateX(-50%) translateY(-50%);
animation-name: testEnd;
animation-delay: 1s;
animation-duration: 18s;
animation-iteration-count: infinite;
animation-fill-mode: forwards;
@keyframes testEnd
0%
transform: translateX(-50%) translateY(-50%) scale(1.2) rotateZ(0);
100%
transform: translateX(-50%) translateY(-50%) scale(1.2) rotateZ(360deg);
@keyframes test-card
0%
transform: translateX(-50%) translateY(-50%) scale(0) rotateY(180deg) rotateZ(0deg);
30%
transform: translateX(-50%) translateY(-50%) scale(0.2) rotateY(180deg) rotateZ(360deg);
50%
transform: translateX(-50%) translateY(-50%) scale(0.5) rotateY(180deg) rotateZ(360deg);
100%
transform: translateX(-50%) translateY(-50%) scale(1.3) rotateY(360deg) rotateZ(360deg);
.test-img
width: 100vw;
</style>
</head>
<body>
<div class="test-end">test-endtest-endtest-endfdsafsda
<img class="test-img" src="https://t7.baidu.com/it/u=91673060,7145840&fm=193&f=GIF" />
</div>
<div class="test-card">test-cardtest-cardtest-cardfafsdafsda
<img class="test-img" src="https://t7.baidu.com/it/u=737555197,308540855&fm=193&f=GIF" alt="">
</div>
<select></select>
<script></script>
</body>
</html>
解决方案
试了z-index的值发现不管用，z-index改的再大也会也会卡出问题。因为设置了transform之后，z-index的会生效。具体原因是因为：给元素设置transform属性会创建一个新的stacking context。生成了一个新的层叠上下文。
所以两个的z-index都是相对于现在的这个层级，无论设置为多大，其实就是新的层级里面自己比较。所以没有生效。
方案1
解决方案就是给他们各包一个父元素没有transform的，这样再使用z-index，定位让他们形成不同的层级，这样他们内部在使用transform形成新的层级，也只是内部再形成了。
解决之后的效果
解决之后的代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
.test-card
display: flex;
flex-direction: column;
align-items: center;
position: fixed;
z-index: 1400;
top: 50%;
left: 50%;
width: rem(560);
transform: translateX(-50%) translateY(-50%) translateZ(1px);
background-size: 100% 100%;
animation-name: test-card;
animation-delay: 1s;
animation-duration: 1s;
animation-timing-function: linear;
animation-iteration-count: 0.99;
animation-fill-mode: forwards;
.test-end
position: absolute;
z-index: 1;
top: 50vh;
left: 50vw;
transform: translateX(-50%) translateY(-50%);
animation-name: testEnd;
animation-delay: 1s;
animation-duration: 18s;
animation-iteration-count: infinite;
animation-fill-mode: forwards;
@keyframes testEnd
0%
transform: translateX(-50%) translateY(-50%) scale(1.2) rotateZ(0);
100%
transform: translateX(-50%) translateY(-50%) scale(1.2) rotateZ(360deg);
@keyframes test-card
0%
transform: translateX(-50%) translateY(-50%) scale(0) rotateY(180deg) rotateZ(0deg);
30%
transform: translateX(-50%) translateY(-50%) scale(0.2) rotateY(180deg) rotateZ(360deg);
50%
transform: translateX(-50%) translateY(-50%) scale(0.5) rotateY(180deg) rotateZ(360deg);
100%
transform: translateX(-50%) translateY(-50%) scale(1.3) rotateY(360deg) rotateZ(360deg);
.test-img
width: 100vw;
.parent-low
position: relative;
z-index: 1;
.parent
position: relative;
z-index: 10;
</style>
</head>
<body>
<div class="parent-low">
<div class="test-end">test-endtest-endtest-endfdsafsda
<img class="test-img" src="https://t7.baidu.com/it/u=91673060,7145840&fm=193&f=GIF" />
</div>
</div>
<div class="parent">
<div class="test-card">test-cardtest-cardtest-cardfafsdafsda
<img class="test-img" src="https://t7.baidu.com/it/u=737555197,308540855&fm=193&f=GIF" alt="">
</div>
</div>
<select></select>
<script></script>
</body>
</html>
方案二
把想要设置的上层元素的translateZ值设置大一点，也可以解决这个问题。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
.test-card
display: flex;
flex-direction: column;
align-items: center;
position: fixed;
z-index: 1400;
top: 50%;
left: 50%;
width: rem(560);
transform: translateX(-50%) translateY(-50%) translateZ(1000px);
background-size: 100% 100%;
animation-name: test-card;
animation-delay: 1s;
animation-duration: 1s;
animation-timing-function: linear;
animation-iteration-count: 0.99;
animation-fill-mode: forwards;
.test-end
position: absolute;
z-index: 1;
top: 50vh;
left: 50vw;
transform: translateX(-50%) translateY(-50%);
animation-name: testEnd;
animation-delay: 1s;
animation-duration: 18s;
animation-iteration-count: infinite;
animation-fill-mode: forwards;
@keyframes testEnd
0%
transform: translateX(-50%) translateY(-50%) scale(1.2) rotateZ(0);
100%
transform: translateX(-50%) translateY(-50%) scale(1.2) rotateZ(360deg);
@keyframes test-card
0%
transform: translateX(-50%) translateY(-50%) translateZ(1000px) scale(0) rotateY(180deg);
30%
transform: translateX(-50%) translateY(-50%) translateZ(1000px) rotateY(180deg);
50%
transform: translateX(-50%) translateY(-50%) translateZ(1000px) rotateY(180deg);
100%
transform: translateX(-50%) translateY(-50%) translateZ(1000px) rotateY(360deg);
.test-img
width: 100vw;
.parent-low
position: relative;
z-index: 1;
.parent
position: relative;
z-index: 10;
</style>
</head>
<body>
<div class="test-end">test-endtest-endtest-endfdsafsda
<img class="test-img" src="https://t7.baidu.com/it/u=91673060,7145840&fm=193&f=GIF" />
</div>
<div class="test-card">test-cardtest-cardtest-cardfafsdafsda
<img class="test-img" src="https://t7.baidu.com/it/u=737555197,308540855&fm=193&f=GIF" alt="">
</div>
<select></select>
<script></script>
</body>
</html>
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