ios - Web 应用程序内存泄漏的硬件加速

Question

我一直在使用 PhoneGap/Cordova 构建 Web 应用程序并且运行良好。

这些应用程序由一系列幻灯片组成，用户可以滑动以转到下一张幻灯片。我一直在使用 idangero 刷卡器来完成此操作。

一旦我尝试扩展我的应用程序以包含更多幻灯片，应用程序就会崩溃并在 XCODE 上显示内存警告。我将其缩小到 CSS3 中的硬件加速(如下)。在不崩溃的情况下，我可以拥有的 MAX 幻灯片数量是 22。添加第 23 张幻灯片后，我收到内存警告并崩溃。

我进一步缩小到

.swiper-slide {
    background-color: #fff;

    -webkit-transform-style: preserve-3d;
    -webkit-transform: translate3d(0,0,0);
  }

当我从下面的 css 中删除两个 webkit-transforms 时，应用程序编译并运行，但第一页上有白屏闪烁，像 slideToggle 这样的简单下拉动画变得不稳定。

idangero CSS

.swiper-container {
    margin:0 auto;
    position:relative;
    overflow:hidden;
    height: 768px;
    width: 1024px;
    z-index:1;

}

.swiper-slide {
    background-color: #fff;

    -webkit-transform-style: preserve-3d;
    -webkit-transform: translate3d(0,0,0);
  }

.swiper-wrapper {
    position:absolute;
    width: 100%;
    -webkit-transition-property:-webkit-transform, left, top;
    -webkit-transition-duration:0s;
    -webkit-transition-timing-function:ease;

    -moz-transition-property:-moz-transform, left, top;
    -moz-transition-duration:0s;
    -moz-transform:translate3d(0px,0,0);
    -moz-transition-timing-function:ease;

    -o-transition-property:-o-transform, left, top;
    -o-transition-duration:0s;
    -o-transform:translate3d(0px,0,0);
    -o-transition-timing-function:ease;
    -o-transform:translate(0px,0px);

    -ms-transition-property:-ms-transform, left, top;
    -ms-transition-duration:0s;
    -ms-transform:translate3d(0px,0,0);
    -ms-transition-timing-function:ease;

    transition-property:transform, left, top;
    transition-duration:0s;
    transform:translate3d(0px,0,0);
    transition-timing-function:ease;


    transform: translate3d(0%,0,0) scale3d(1,1,1);
    -o-transform: translate3d(0%,0,0) scale3d(1,1,1);
    -ms-transform: translate3d(0%,0,0) scale3d(1,1,1);
    -moz-transform: translate3d(0%,0,0) scale3d(1,1,1);
    -webkit-transform: translate3d(0%,0,0) scale3d(1,1,1);
    overflow: hidden;
    -webkit-backface-visibility: hidden;
    -webkit-transform-style: preserve-3d;


}

.swiper-free-mode > .swiper-wrapper {
    -webkit-transition-timing-function: ease-out;
    -moz-transition-timing-function: ease-out;
    -ms-transition-timing-function: ease-out;
    -o-transition-timing-function: ease-out;
    transition-timing-function: ease-out;
    margin: 0 auto;

}
.swiper-slide {
    float: left;
}

/* IE10 Windows Phone 8 Fixes */
.swiper-wp8-horizontal {
    -ms-touch-action: pan-y;
}
.swiper-wp8-vertical {
    -ms-touch-action: pan-x;
}

2 个“幻灯片”的示例 html

<div class="swiper-container">
            <div class="swiper-wrapper">

                <!-- Home (Page 1) = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
                <div id="home" class="swiper-slide" rel="bkg-home.jpg">
                    <div class="page">
                        <h1>TEXt HErE</h1>   
                        <h3>Header 3</h3>
                    </div><!-- /page -->
                </div><!-- /home -->

                <!-- Page 2 = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =  -->
                <div id="p2" class="swiper-slide" rel="bkg-2.jpg">
                    <div class="page">
                        <div class="menu-trigger"></div>
                        <h1 style="padding-top:17px;">MORE TITLES</h1> 
                        <div class="content">
                            <div id="table-of-contents">
                                <ul>
                                     <li><a href="#p3">Issue Overview </a></li>
                                     <li><a href="#p4">Content1</a></li>
                                     <li><a href="#p6">Content2</a></li>
                                     <li><a href="#p30">Content3</a></li>
                                     <li><a href="#p17">Content4</a></li>
            </ul>
                                </ul>
                            </div><!-- /table-of-contents -->

                        </div><!-- /content -->
                        <div class="header"></div><!-- /header -->
                        <div class="footer"></div><!-- /footer -->
                        <div class="footer-segment"></div><!-- /footer-segment -->
                    </div><!-- /page -->
                </div><!-- /p2 -->
       </div>
</div>

看来我需要硬件加速 CSS3 才能使应用程序平稳运行，但它似乎也会导致崩溃。有没有人有变通代码可以让我的应用程序顺利运行但不会导致整个应用程序崩溃？

Answer 1

我会尝试两种不同的方法。

1 将改变

据说硬件加速的 future 是新的 will-change css 属性。

https://dev.opera.com/articles/css-will-change-property/

.swiper-slide {
  background-color: #fff;
  -webkit-transform-style: preserve-3d;
  /* -webkit-transform: translate3d(0,0,0); */
  will-change: transform, top, left;
}

2 transforms are cheaper than positioning with top and left

我无法确定您在 top 和 left 上使用 transition 的确切位置，但我会尝试替换 top/left 使用 translateX()、translateY() 或 translate()。