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使用border-image实现类似iOS7的1px底边 #4

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maxzhang opened this issue Aug 2, 2013 · 11 comments
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使用border-image实现类似iOS7的1px底边 #4

maxzhang opened this issue Aug 2, 2013 · 11 comments
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@maxzhang
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maxzhang commented Aug 2, 2013

使用border-image实现类似iOS7的1px底边

iOS7已经发布有一段时间，扁平化设计风格有很多值得称赞的地方，其中有很多设计细节都是值得研究的。

首先，来看下面iOS设置的截图中的border：

从上面的截图可以看到iOS7的设计是非常精细的，border是一根非常细的线。这篇文章将说明如何使用border-image实现iOS7的border效果。

在看下面的内容之前，需要先了解devicePixelRatio和border-image，不熟悉的同学请自行脑补：

border属性实现效果

我们在实现border时通常都是使用border属性，如下：

.border-1px {
    border-width: 1px 0;
    border-style: solid;
    border-color: #333;
}

显示效果对比：

border对比效果

上面这张图片可以看到，在手机上border无法达到我们想要的效果。这是因为devicePixelRatio特性导致，iPhone的devicePixelRatio==2，而border-width: 1px描述的是设备独立像素，所以，border被放大到物理像素2px显示，在iPhone上就显得较粗。

使用border-image属性实现物理1px

通常手机端的页面设计稿都是放大一倍的，如：为适应iphone retina，设计稿会设计成640*960的分辨率，图片按照2倍大小切出来，在手机端看着就不会虚化，非常清晰。

同样，在使用border-image时，将border设计为物理1px，如下：

border image 放大

样式设置：

.border-image-1px {
    border-width: 1px 0px;
    -webkit-border-image: url("border.png") 2 0 stretch;
    border-image: url("border.png") 2 0 stretch;
}

显示效果对比：

border image 对比效果

这里在手机上的效果和iOS7已经非常接近了。

样例：http://maxzhang.github.com/examples/border1px/index.html

Note: border.png也可以直接使用的base64替代

.border-image-1px {
    border-width: 1px 0px;
    -webkit-border-image: url("data:image/png;base64,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") 2 0 stretch;
}

结束语

博客迁移到GitHub的第一篇文章，Hello GitHub!
@yisibl
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yisibl commented May 13, 2014

使用图片当更改颜色的时候，显得不灵活了。

@shinekwow
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颜色会发虚，并且无法支持3倍分辨率啊

@hkongm
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hkongm commented Jul 8, 2014

还好没遇到这么变态的需求过。

@maxzhang
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maxzhang commented Sep 9, 2014

发现一个1px边框生成器，http://retinahairlinegenerator.com/

@smallmacro
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= =.膜拜。。你好能折腾。。

@denvey
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denvey commented Sep 23, 2014

这个好咯

@zhangjianying1
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怎么我这还是一样，没啥变化呢？

@hefangshi
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http://retinahairlinegenerator.com/ 用不了了，弄了个简单的

http://hefangshi.github.io/1px.html

@shinekwow
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OSX10.10和iOS8.0支持半像素了

@media (-webkit-min-device-pixel-ratio: 2) {
    .one-pixel-border {
        border-width: 0.5px;
    }
}

@fanky-c
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fanky-c commented May 26, 2015

我表示遇到过

@huanghuiquan
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使用伪类+缩放完美实现1px 预览效果

@zhongDZ zhongDZ mentioned this issue Feb 9, 2017
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@chen77 chen77 mentioned this issue Jan 10, 2018
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@hefangshi @hkongm @maxzhang @huanghuiquan @shinekwow @yisibl @denvey @smallmacro @zhangjianying1 @fanky-c