scss SCSS mixin支持所有iOS Safari版本的vh和vw单元。基于Patrick Burtchaell的想法:https://gist.github.com/pburtcha

Posted

tags:

篇首语:本文由小常识网(cha138.com)小编为大家整理,主要介绍了scss SCSS mixin支持所有iOS Safari版本的vh和vw单元。基于Patrick Burtchaell的想法:https://gist.github.com/pburtcha相关的知识,希望对你有一定的参考价值。


/**
 * Fix for vw, vh, vmin, vmax on iOS 7.
 * http://caniuse.com/#feat=viewport-units
 *
 * This fix works by replacing viewport units with px values on known screen sizes.
 *
 * iPhone 6 and 6 Plus cannot run iOS 7, so are not targeted by this fix.
 * Target devices running iOS 8+ will incidentally execute the media query,
 * but this will still produce the expected result; so this is not a problem.
 *
 * As an example, replace:
 *
 *   height: 50vh;
 *   font-size: 5vmin;
 *
 * with:
 *
 *   @include viewport-unit(height, 50vh);
 *   @include viewport-unit(font-size, 5vmin);
 */
@mixin viewport-unit($property, $value) {
  #{$property}: $value;

  $unit: unit($value);

  @if (index((vw, vh, vmin, vmax), $unit) != null) {
    $devices: (
      (768px, 1024px), // iPad (all versions)
      (320px, 480px),  // iPhone 4
      (320px, 568px)   // iPhone 5, 5C, 5S
    );

    @each $device in $devices {
      $device-width: nth($device, 1);
      $device-height: nth($device, 2);

      $device-query: "only screen and (-webkit-min-device-pixel-ratio: 1)";
      $device-query: "#{$device-query} and (device-width: #{$device-width})";
      $device-query: "#{$device-query} and (device-height: #{$device-height})";

      $percent: $value / ($value * 0 + 1); // see https://github.com/sass/sass/issues/533

      $percent-width: $device-width * $percent / 100;
      $percent-height: $device-height * $percent / 100;

      @if ($unit == vmin or $unit == vmax) {
        @media #{$device-query} {
          #{$property}: if($unit == vmin, $percent-width, $percent-height);
        }
      }
      @else {
        @media #{$device-query} and (orientation: portrait) {
          #{$property}: if($unit == vw, $percent-width, $percent-height);
        }

        @media #{$device-query} and (orientation: landscape) {
          #{$property}: if($unit == vw, $percent-height, $percent-width);
        }
      }
    }
  }
}

以上是关于scss SCSS mixin支持所有iOS Safari版本的vh和vw单元。基于Patrick Burtchaell的想法:https://gist.github.com/pburtcha的主要内容,如果未能解决你的问题,请参考以下文章

scss Mixins使用flexbox进行跨浏览器支持

scss Linear-Gradient SCSS Mixin使用供应商前缀快速轻松地创建背景渐变,以获得最大的浏览器支持。

scss 灰度和棕褐色滤镜SASS mixin(支持SVG滤镜)

scss 灰度和棕褐色滤镜SASS mixin(支持SVG滤镜)

附加到 SCSS @mixin 的奇怪字符

text 简单但有效,Opacity SCSS Mixin将应用供应商前缀以改进浏览器支持。