适用于iOS网络应用的多个"苹果触摸启动图像"分辨率(尤其适用于iPad)？

Question

我已经编写了一个基于HTML5的iOS Web应用程序,似乎都运行良好,但我正在尝试用多个启动屏幕来完善它.iPhone/iPod touch适用于320x460的PNG,如下所示:

<link rel="apple-touch-startup-image" href="img/startup_screen-320x460.png" />

我发现大量的文档说明iPad的启动图像应该像iPhone/iPod touch一样,从高度上剃掉20px,以适应状态栏,分辨率为768x1004(纵向)或1024x748(横向).但是,在我的测试中(目前用于运行iOS 3.2.2的iPad),只有768x1004(人像)分辨率可以工作(但是在横向模式下不正确 - 20px太窄 - ).

我尝试了以下(基于apple-touch-icon链接功能的疯狂猜测),但无济于事:

<link rel="apple-touch-startup-image" href="img/startup_screen-320x460.png" />
<link rel="apple-touch-startup-image" sizes="1024x748" href="img/startup_screen-1024x748.png" />
<link rel="apple-touch-startup-image" sizes="768x1004" href="img/startup_screen-768x1004.png" />

如果它是link列出的最后一个元素,则只有768x1004分辨率图像有效.如果1024x748分辨率图像是最后一个,则会呈现灰色背景(但不会是768x1004).所以,显然apple-touch-startup-image link不支持该sizes属性.

iOS的较新版本是否支持此功能？有没有办法支持多个启动图像？我应该创建1024x768启动映像吗？如果是这样,iPhone/iPod touch的缩小比例是多少？或者,我应该放弃,而不是iPad的启动图像？

Answer 1

适用于iPad和iPhone的启动图像和触摸图标的最终解决方案(风景||肖像)和(视网膜||不):

        <!-- iPhone ICON -->
        <link href="apple-touch-icon-57x57.png" sizes="57x57" rel="apple-touch-icon">
        <!-- iPad ICON-->
        <link href="apple-touch-icon-72x72.png" sizes="72x72" rel="apple-touch-icon">
        <!-- iPhone (Retina) ICON-->
        <link href="apple-touch-icon-114x114.png" sizes="114x114" rel="apple-touch-icon">
        <!-- iPad (Retina) ICON-->
        <link href="apple-touch-icon-144x144.png" sizes="144x144" rel="apple-touch-icon">

        <!-- iPhone SPLASHSCREEN-->
        <link href="apple-touch-startup-image-320x460.png" media="(device-width: 320px)" rel="apple-touch-startup-image">
        <!-- iPhone (Retina) SPLASHSCREEN-->
        <link href="apple-touch-startup-image-640x920.png" media="(device-width: 320px) and (-webkit-device-pixel-ratio: 2)" rel="apple-touch-startup-image">
        <!-- iPad (portrait) SPLASHSCREEN-->
        <link href="apple-touch-startup-image-768x1004.png" media="(device-width: 768px) and (orientation: portrait)" rel="apple-touch-startup-image">
        <!-- iPad (landscape) SPLASHSCREEN-->
        <link href="apple-touch-startup-image-748x1024.png" media="(device-width: 768px) and (orientation: landscape)" rel="apple-touch-startup-image">
        <!-- iPad (Retina, portrait) SPLASHSCREEN-->
        <link href="apple-touch-startup-image-1536x2008.png" media="(device-width: 1536px) and (orientation: portrait) and (-webkit-device-pixel-ratio: 2)" rel="apple-touch-startup-image">
        <!-- iPad (Retina, landscape) SPLASHSCREEN-->
        <link href="apple-touch-startup-image-2048x1496.png" media="(device-width: 1536px)  and (orientation: landscape) and (-webkit-device-pixel-ratio: 2)" rel="apple-touch-startup-image">
        <!-- iPhone 6/7/8 -->
        <link href="/images/favicon/750x1334.png" media="(device-width: 375px) and (-webkit-device-pixel-ratio: 2)" rel="apple-touch-startup-image" />
        <!-- iPhone 6 Plus/7 Plus/8 Plus -->
        <link href="/images/favicon/1242x2208.png" media="(device-width: 414px) and (-webkit-device-pixel-ratio: 3)" rel="apple-touch-startup-image" />

Answer 2

我实际上让它在横向模式下工作.我在这里得到了信息:https://gist.github.com/472519.

问题是景观图像必须是748x1024(侧面的横向图像,我顺时针旋转)而不是1024x748.

我还必须首先以纵向模式启动应用程序然后横向启动.

Answer 3

我只想提供实际有用的答案组合.我们发现选择的答案,没有使用飞溅图像的视网膜版本.Pavel的答案修复了iPad的视网膜版本.以下内容已经在iPhone(Retina和非视网膜)和iPad(视网膜和非视网膜)上进行了测试.

<!-- For third-generation iPad with high-resolution Retina display: -->
<link rel="apple-touch-icon-precomposed" sizes="144x144" href="apple-touch-icon-144x144-precomposed.png">
<!-- For iPhone with high-resolution Retina display: -->
<link rel="apple-touch-icon-precomposed" sizes="114x114" href="apple-touch-icon-114x114-precomposed.png">
<!-- For first- and second-generation iPad: -->
<link rel="apple-touch-icon-precomposed" sizes="72x72" href="apple-touch-icon-72x72-precomposed.png">
<!-- For non-Retina iPhone, iPod Touch, and Android 2.1+ devices: -->
<link rel="apple-touch-icon-precomposed" href="apple-touch-icon-precomposed.png">

<!-- iPhone SPLASHSCREEN-->
<link href="apple-touch-startup-image-320x460.png" media="(device-width: 320px)" rel="apple-touch-startup-image">
<!-- iPhone (Retina) SPLASHSCREEN-->
<link href="apple-touch-startup-image-640x920.png" media="(device-width: 320px) and (device-height: 460px) and (-webkit-device-pixel-ratio: 2)" rel="apple-touch-startup-image">
<!-- iPhone 5 (Retina) SPLASHSCREEN-->
<link href="apple-touch-startup-image-640x1096.png" media="(device-width: 320px) and (device-height: 568px) and (-webkit-device-pixel-ratio: 2)" rel="apple-touch-startup-image">
<!-- iPad (non-Retina) (Portrait) -->
<link href="apple-touch-startup-image-768x1004.png" media="screen and (min-device-width: 481px) and (max-device-width: 1024px) and (orientation:portrait)" rel="apple-touch-startup-image" />
<!-- iPad (non-Retina) (Landscape) -->
<link href="apple-touch-startup-image-1024x748.png" media="screen and (min-device-width: 481px) and (max-device-width: 1024px) and (orientation:landscape)" rel="apple-touch-startup-image" />
<!-- iPad (Retina) (Portrait) -->
<link href="apple-touch-startup-image-1536x2008.png" media="screen and (min-device-width: 481px) and (max-device-width: 1024px) and (orientation:portrait) and (-webkit-min-device-pixel-ratio: 2)" rel="apple-touch-startup-image" />
<!-- iPad (Retina) (Landscape) -->
<link href="apple-touch-startup-image-2048x1496.png" media="screen and (min-device-width: 481px) and (max-device-width: 1024px) and (orientation:landscape) and (-webkit-min-device-pixel-ratio: 2)" rel="apple-touch-startup-image" />

我不能相信任何这一点,但这种配置有效.只需复制和粘贴,确保使图像完全符合其名称中指定的大小.

Answer 4

如果一个链接元素缺少媒体属性,则事情对我不起作用.代码在iPhone 3G和iPad上成功显示了启动图像(纵向和横向模式).

<-- iPad - landscape (748x1024) -->
<link rel="apple-touch-startup-image" href="images/ipad-landscape.png"  media="screen and (min-device-width: 481px) and (max-device-width: 1024px) and (orientation:landscape)" />
<-- iPad - portrait (768x1004) -->  
<link rel="apple-touch-startup-image" href="images/ipad-portrait.png" media="screen and (min-device-width: 481px) and (max-device-width: 1024px) and (orientation:portrait)" />
<-- iPhone - (320x460) -->
<link rel="apple-touch-startup-image" href="images/iphone-lowres.png" media="screen and (min-device-width: 200px) and (max-device-width: 320) and (orientation:portrait)" />

无法尝试iPhone4(高分辨率),但最有可能它的工作方式相同.

Answer 5

这个答案提供了一种方便的方法来生成 iOS 当前所需的所有 20 个初始屏幕+ 适用于iOS 12.1的最新 HTML 标记。

这包括适用于 iPhone XR、iPhone XS Max 和 11" iPad Pro 的解决方案

语境

iOS 上的 Safari 现在支持渐进式 Web 应用程序，但实现方式与 Chrome 不同。它确实读取了manifest文件，但忽略了其中声明的图标。

相反，Safari 需要一个apple-touch-startup-image标签列表。虽然官方 Apple 文档列出了这个例子：

<link rel="apple-touch-startup-image" href="/launch.png">

...这是一种误导，因为（至少从 iOS 12.1 开始），一张图片是不够的，而且不会工作。相反，Safari 期望每个分辨率有一个图像。

如果初始屏幕丢失或不正确，加载时将显示白屏，这看起来不专业，并且使（网络）应用程序感觉缓慢。

生成启动画面

网上有apple-touch-startup-image 生成器，但它们要么坏了，要么完全忽略了 Landscape，而且它们的命名约定也不是很好。这更容易。

在包含logo.png文件的目录中的 bash 中运行以下命令，它将生成 Safari 期望的 20 个图像（十个分辨率，分别用于纵向和横向）：

array=( 0640x1136 0750x1334 0828x1792 1125x2436 1242x2208 1242x2688 1536x2048 1668x2224 1668x2388 2048x2732 )
for i in "${array[@]}"
do
  split=(${i//x/ })
  portrait=$i
  landscape=${split[1]}x${split[0]}
  gm convert -background white -geometry $((10#${split[0]} / 5)) "logo.png" -gravity center -extent ${portrait}  splash-portrait-${portrait}.png
  gm convert -background white -geometry $((10#${split[0]} / 5)) "logo.png" -gravity center -extent ${landscape} splash-landscape-${landscape}.png
done

这依赖于GraphicsMagick，它是 ImageMagick 的更好替代品。（在 macOS 上，使用 brew，安装就像brew install graphicsmagick.

标记

这是所有 20 个文件的 HTML 标记：

<!--
 # SPLASH SCREENS FOR iOS.
 #
 # If the splash screen is missing or incorrect, a white screen will show on load, which looks unprofessional
 # and makes the (web)app feel slow.
 #
 # Constraints:
 # - Cannot use a single image for all.
 # - The size of the image must fit that of the targeted device, else no splash screen will show.
 # - There seems to be some leeway (e.g.: pictures 40px and 60px shorter did work), but unclear how much.
 # Bottom-line: you need one splash screen per resolution and orientation.
 #
 #
 # List of devices and resolutions (AUG-2019):
 #
 #     Device              Portrait size      Landscape size     Screen size        Pixel ratio
 #     iPhone SE            640px × 1136px    1136px ×  640px     320px ×  568px    2
 #     iPhone 8             750px × 1334px    1334px ×  750px     375px ×  667px    2
 #     iPhone 7             750px × 1334px    1334px ×  750px     375px ×  667px    2
 #     iPhone 6s            750px × 1334px    1334px ×  750px     375px ×  667px    2
 #     iPhone XR            828px × 1792px    1792px ×  828px     414px ×  896px    2
 #     iPhone XS           1125px × 2436px    2436px × 1125px     375px ×  812px    3
 #     iPhone X            1125px × 2436px    2436px × 1125px     375px ×  812px    3
 #     iPhone 8 Plus       1242px × 2208px    2208px × 1242px     414px ×  736px    3
 #     iPhone 7 Plus       1242px × 2208px    2208px × 1242px     414px ×  736px    3
 #     iPhone 6s Plus      1242px × 2208px    2208px × 1242px     414px ×  736px    3
 #     iPhone XS Max       1242px × 2688px    2688px × 1242px     414px ×  896px    3
 #     9.7" iPad           1536px × 2048px    2048px × 1536px     768px × 1024px    2
 #     7.9" iPad mini 4    1536px × 2048px    2048px × 1536px     768px × 1024px    2
 #     10.5" iPad Pro      1668px × 2224px    2224px × 1668px     834px × 1112px    2
 #     11" iPad Pro        1668px × 2388px    2388px × 1668px     834px × 1194px    2
 #     12.9" iPad Pro      2048px × 2732px    2732px × 2048px    1024px × 1366px    2
 #
 # Sources:
 # - Device and resolutions (Portrait size, Landscape size) from https://developer.apple.com/design/human-interface-guidelines/ios/icons-and-images/launch-screen/
 # - Screen width as measured by JavaScript's `screen.width` and `screen.height` in Simulator, except for:
 #   - 7.9" iPad mini 4 (not in Simulator): https://developer.apple.com/library/archive/documentation/DeviceInformation/Reference/iOSDeviceCompatibility/Displays/Displays.html
 #   - 9.7" iPad (not in Simulator): had to assume they meant iPad Pro.
 #
 #
 # Tested on the following devices, in Simulator with iOS 12.1, in both Portrait and Landscape:
 #   iPhone 5s, iPhone 6, iPhone 6 Plus, iPhone 6s, iPhone 6s Plus, iPhone 7, iPhone 7 Plus, iPhone 8,
 #   iPhone 8 Plus, iPhone SE, iPhone X, iPhone XS, iPhone XS Max, iPhone XR, iPad Air, iPad Air 2,
 #   iPad (5th generation), iPad Pro (9.7-inch), iPad Pro (12.9-inch), iPad Pro (12.9-inch) (2nd generation),
 #   iPad Pro (10.5-inch), iPad (6th generation), iPad Pro (11-inch), iPad Pro (12.9-inch) (3rd generation).
 # Everything worked fine (splash screen showing in every single case.)
 #
 # FYI:
 # - tvOS does not come with a browser. So the largest screen to care for is an iPad.)
 # - On all iPads (in Simulator), had to either Add to Home twice or restart the device to see the icon.
 #   WOULDDO Test on a real iPad.
 -->
<link rel="apple-touch-startup-image" href="/assets/site/img/splash/splash-portrait-0640x1136.png" media="(device-width:  320px) and (device-height:  568px) and (-webkit-device-pixel-ratio: 2) and (orientation: portrait)">
<link rel="apple-touch-startup-image" href="/assets/site/img/splash/splash-portrait-0750x1334.png" media="(device-width:  375px) and (device-height:  667px) and (-webkit-device-pixel-ratio: 2) and (orientation: portrait)">
<link rel="apple-touch-startup-image" href="/assets/site/img/splash/splash-portrait-0828x1792.png" media="(device-width:  414px) and (device-height:  896px) and (-webkit-device-pixel-ratio: 2) and (orientation: portrait)">
<link rel="apple-touch-startup-image" href="/assets/site/img/splash/splash-portrait-1125x2436.png" media="(device-width:  375px) and (device-height:  812px) and (-webkit-device-pixel-ratio: 3) and (orientation: portrait)">
<link rel="apple-touch-startup-image" href="/assets/site/img/splash/splash-portrait-1242x2208.png" media="(device-width:  414px) and (device-height:  736px) and (-webkit-device-pixel-ratio: 3) and (orientation: portrait)">
<link rel="apple-touch-startup-image" href="/assets/site/img/splash/splash-portrait-1242x2688.png" media="(device-width:  414px) and (device-height:  896px) and (-webkit-device-pixel-ratio: 3) and (orientation: portrait)">
<link rel="apple-touch-startup-image" href="/assets/site/img/splash/splash-portrait-1536x2048.png" media="(device-width:  768px) and (device-height: 1024px) and (-webkit-device-pixel-ratio: 2) and (orientation: portrait)">
<link rel="apple-touch-startup-image" href="/assets/site/img/splash/splash-portrait-1668x2224.png" media="(device-width:  834px) and (device-height: 1112px) and (-webkit-device-pixel-ratio: 2) and (orientation: portrait)">
<link rel="apple-touch-startup-image" href="/assets/site/img/splash/splash-portrait-1668x2388.png" media="(device-width:  834px) and (device-height: 1194px) and (-webkit-device-pixel-ratio: 2) and (orientation: portrait)">
<link rel="apple-touch-startup-image" href="/assets/site/img/splash/splash-portrait-2048x2732.png" media="(device-width: 1024px) and (device-height: 1366px) and (-webkit-device-pixel-ratio: 2) and (orientation: portrait)">

<link rel="apple-touch-startup-image" href="/assets/site/img/splash/splash-landscape-1136x0640.png" media="(device-width:  320px) and (device-height:  568px) and (-webkit-device-pixel-ratio: 2) and (orientation: landscape)">
<link rel="apple-touch-startup-image" href="/assets/site/img/splash/splash-landscape-1334x0750.png" media="(device-width:  375px) and (device-height:  667px) and (-webkit-device-pixel-ratio: 2) and (orientation: landscape)">
<link rel="apple-touch-startup-image" href="/assets/site/img/splash/splash-landscape-1792x0828.png" media="(device-width:  414px) and (device-height:  896px) and (-webkit-device-pixel-ratio: 2) and (orientation: landscape)">
<link rel="apple-touch-startup-image" href="/assets/site/img/splash/splash-landscape-2436x1125.png" media="(device-width:  375px) and (device-height:  812px) and (-webkit-device-pixel-ratio: 3) and (orientation: landscape)">
<link rel="apple-touch-startup-image" href="/assets/site/img/splash/splash-landscape-2208x1242.png" media="(device-width:  414px) and (device-height:  736px) and (-webkit-device-pixel-ratio: 3) and (orientation: landscape)">
<link rel="apple-touch-startup-image" href="/assets/site/img/splash/splash-landscape-2688x1242.png" media="(device-width:  414px) and (device-height:  896px) and (-webkit-device-pixel-ratio: 3) and (orientation: landscape)">
<link rel="apple-touch-startup-image" href="/assets/site/img/splash/splash-landscape-2048x1536.png" media="(device-width:  768px) and (device-height: 1024px) and (-webkit-device-pixel-ratio: 2) and (orientation: landscape)">
<link rel="apple-touch-startup-image" href="/assets/site/img/splash/splash-landscape-2224x1668.png" media="(device-width:  834px) and (device-height: 1112px) and (-webkit-device-pixel-ratio: 2) and (orientation: landscape)">
<link rel="apple-touch-startup-image" href="/assets/site/img/splash/splash-landscape-2388x1668.png" media="(device-width:  834px) and (device-height: 1194px) and (-webkit-device-pixel-ratio: 2) and (orientation: landscape)">
<link rel="apple-touch-startup-image" href="/assets/site/img/splash/splash-landscape-2732x2048.png" media="(device-width: 1024px) and (device-height: 1366px) and (-webkit-device-pixel-ratio: 2) and (orientation: landscape)">

（就我个人而言，我将评论保留在 Twig 评论块中，这样我就可以保留信息而不会用过多的文本污染客户的信息。）

我在网上看到的一些例子使用了min-device-*，但在这种情况下这没有意义，因为 Safari 需要（接近）精确尺寸的图片。

我看到的其他一些示例使用了更短的图像（更短 40 或 60 像素，即没有状态栏）。旧版本的 iOS 似乎已经预料到了这样的尺寸，但现在已经不是这样了。

离别思绪

我的 iOS 用户中有 96% 使用 iOS 12.x，所以幸运的是无需太在意较旧的 iOS 版本。但如果我错过了什么，请告诉我。

Android 就像一个大男孩，很乐意将应用程序的图标显示为启动画面的一部分，而 iOS 和 Safari 则迫使我们完成所有这些额外的工作。20 张图像显示一个简单的启动画面！这太疯狂了！将来情况可能会好转，但现在就是这样。

这项基本任务需要大量的编码和测试。我希望它会帮助某人。

我会尽量用更新的分辨率来更新。如果您发现缺少一个，请发表评论。

Answer 6

显然，启动屏幕仅在以下条件下起作用

1) 必须是设备所需的精确尺寸。2) 应用程序启动时，设备必须处于纵向状态。3）一些消息来源说只能使用 png，但 jpg 似乎现在可以使用。