Web view that remains fixed regardless of resolution, compatible with both iPhone and iPhone4 devices

Looking to create a webview with one HTML and one CSS file that displays graphics at the same size, but in their native resolution.

Currently, my webviews built for 320x480 appear sharp when scaled up (text and border-radius), but images are displayed at half resolution in the iPhone4 simulator. Is there a way to simulate the automatic selection of a graphic or its double resolution version using HTML, CSS, or possibly without JavaScript?

I am currently using a viewport declaration like this:

<meta content='initial-scale=0.5; maximum-scale=1.0; minimum-scale=0.5; user-scalable=0;' name='viewport' />

This setting zooms out so image pixels match display pixels at a 1:1 ratio, but it also scales down everything else and makes the content very small on smaller iPhone screens.

I suspect that a viewport size media query might be the solution to this issue.

iphonecssuiwebview

Answer №1

To display a custom stylesheet for iPhone 4, use the following code:

<link
    rel="stylesheet" type="text/css" href="/css/style.css" media="only screen and (-webkit-min-device-pixel-ratio: 2)"
/>

Answer №2

I recently discovered a neat trick:

By using this code snippet, you can load an iPhone 4 stylesheet:

<link
    rel="stylesheet"
    type="text/css"
    href="/css/retina.css"
    media="only screen and (-webkit-min-device-pixel-ratio: 2)"
/>

To make it work, simply set your background size property in the low resolution stylesheet to match the size of the image:

.demoImage
{
    background-image: url(../images/my-image-64.png);
    background-size: 64px 64px;
    background-repeat: no-repeat;
}

In the retina.css file, display the double resolution version like this:

.demoImage
{
    background-image: url(../images/my-image-128.png);
}

With this setup, the CSS background image will show a 128x128 image as if it were 64 CSS pixels, achieving a 1:1 pixel ratio display on an iPhone 4.

Answer №3

I'm facing a similar challenge. Although I haven't had the opportunity to address it yet, my approach involves generating graphics with a higher pixel density and utilizing them for both iPhone 3G(s) and iPhone 4.

I'm uncertain of its success, but it's definitely worth experimenting with.

Answer №4

If you are looking to implement a CSS media query, make sure that it is structured correctly:

@media only screen and (min-resolution: 300dpi) { ... }

In addition, A List Apart has provided a useful technique for serving high-resolution images. Although the article focuses on print styles, the method can easily be applied in other contexts.

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