uniapp\ taro 如何使用 UnoCSS 原子化css

unocss-preset-weapp

相较于 tailwindcss 和 windicss, unocss的性能和可扩展性都优于它们

UnoCSS小程序预设 unocss-preset-weapp

内置 transformer 用于兼容小程序

• transformerClass 转换转义类名，解决小程序不支持`\\`，`\:`，`\[`， `\$`，`\.`等转义类名,保持原子化css的规范去书写class
• transformerAttributify，用于支持 attributify mode

---

uniapp-vue3 demo 在线地址​playful-gumption-4bb42b.netlify.app/

使用

uniapp-vue2

使用配置与DEMO

uniapp-vue3

使用配置与DEMO

taro for react vue2 vue3

使用配置与DEMO

原生微信小程序 wxml

使用配置与DEMO

---

其他

修改 w h 默认单位

unocss-preset-weapp，wh默认单位 `rpx`，例如

.text-20 {
 font-size: 20rpx;
}

.h-10 {
 height: 10rpx;
}

.top-10 {
 top: 10rpx;
}

设置 whRpx为 false，修改默认单位，按 rem 规则递增

• unocss.config.ts

import presetWeapp from 'unocss-preset-weapp'
export default defineConfig({
  presets: [
 presetWeapp({
      whRpx: false,
    }),
  ],
})

.text-20 {
 font-size: 160rpx;
}

.h-10 {
 height: 80rpx;
}

.top-10 {
 top: 160rpx;
}

自定义转换规则

如需更改默认的转换规则，可通过  transformRules 进行修改

• unocss.config.js

import presetWeapp from 'unocss-preset-weapp'
import { extractorAttributify, transformerClass } from 'unocss-preset-weapp/transformer'
import { defineConfig } from 'unocss'

const transformRules = {
  '.': '-d111-',
  '/': '-s111-',
  ':': '-c111-',
  '%': '-p111-',
  '!': '-e111-',
  '#': '-w111-',
  '(': '-b111l-',
  ')': '-b111r-',
  '[': '-f111l-',
  ']': '-f111r-',
  '$': '-r111-',
  ',': '-r222-',
}

const { presetWeappAttributify, transformerAttributify } = extractorAttributify({
  transformRules
})

export default defineConfig({
  presets: [
    // https://github.com/MellowCo/unocss-preset-weapp
    presetWeapp({
      transformRules,
    }),
    // attributify autocomplete
    presetWeappAttributify()
  ],
  transformers: [
    // options 见https://github.com/MellowCo/unocss-preset-weapp/tree/main/src/transformer/transformerAttributify
    transformerAttributify({
      transformRules,
    }),

    // options 见https://github.com/MellowCo/unocss-preset-weapp/tree/main/src/transformer/transformerClass
    transformerClass({
      transformRules,
    }),
  ],
})

---

原子化 css 冲突问题

例如  tmui，自身有一套 原子化 css，导致与 unocss 冲突

• unocss.config.ts

presetWeapp 配置  prefix,  transformerAttributify 配置  classPrefix

import presetWeapp from 'unocss-preset-weapp'
import { extractorAttributify, transformerClass } from 'unocss-preset-weapp/transformer'
import { defineConfig } from 'unocss'

const prefix = 'li-'

const { presetWeappAttributify, transformerAttributify } = extractorAttributify({
  classPrefix: prefix
})

export default defineConfig({
  presets: [
    // https://github.com/MellowCo/unocss-preset-weapp
    presetWeapp({
      prefix
    }),
    // attributify autocomplet
    presetWeappAttributify()
  ],
  transformers: [
    // options 见https://github.com/MellowCo/unocss-preset-weapp/tree/main/src/transformer/transformerAttributify
    transformerAttributify(),

    // options 见https://github.com/MellowCo/unocss-preset-weapp/tree/main/src/transformer/transformerClass
    transformerClass(),
  ],
})

这样冲突问题就解决了

  this is a unocss

transform

  this is a unocss

tm-ui-demo

css预设

UnoCSS 文档

Windi CSS文档

默认单位 rpx，w-100 => w-100rpx

渐变背景 (v0.1.12)

gradients

animation (v0.1.9)

参考 windicss-animation @windicss/plugin-animations

相关动画网站 animate.css animista.net

• unocss.config.js 自定义动画

import presetWeapp from 'unocss-preset-weapp'
import { defineConfig } from 'unocss'

export default defineConfig({
  presets: [
    // https://github.com/MellowCo/unocss-preset-weapp
    presetWeapp(),
  ],
  theme: {
    // v0.1.9 加入动画预设
    // https://github.com/MellowCo/unocss-preset-weapp#animation-v019
    // 设置自定义动画
    animation: {
      keyframes: {
        'my-animation': '{0% {letter-spacing: -0.5em;transform: translateZ(-700px);opacity: 0;}40% {opacity: 0.6;}100% {transform: translateZ(0);opacity: 1;}}',
      },
      durations: {
        'my-animation': '0.8s',
      },
      counts: {
        'my-animation': 'infinite',
      },
      timingFns: {
        'my-animation': 'cubic-bezier(0.215, 0.610, 0.355, 1.000)',
      },
    },
  },
})






.animate--fl-4s_linear_0s_infinite_alternate_bounce-fr- {
  -webkit-animation: 4s linear 0s infinite alternate bounce;
  animation: 4s linear 0s infinite alternate bounce;
}

safe-area (v0.1.6)

class	Properties
p-safe	padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left)
pt-safe	padding-top: env(safe-area-inset-top)
pb-safe	padding-bottom: env(safe-area-inset-bottom)
pl-safe	padding-left: env(safe-area-inset-left)
pr-safe	padding-right: env(safe-area-inset-right)

width and height

class	Properties
h-1_2 h-1/2 h-half	height: 50%
w-1_3 w-1/3	width: 33.33333%
h-full	height: 100%
width-20	width: 20r
h-xs	height: 180rpx

预设

export const baseSize = {
  'xs': '180rpx',
  'sm': '220rpx',
  'md': '260rpx',
  'lg': '300rpx',
  'xl': '340rpx',
  '2xl': '390rpx',
  '3xl': '440rpx',
  '4xl': '490rpx',
  '5xl': '540rpx',
  '6xl': '590rpx',
  '7xl': '640rpx',
  '8xl': '690rpx',
  '9xl': '740rpx',
  'full': '100%',
  'half': '50%',
}

---

border

class	Properties
border-2	border-width:2rpx;border-style:solid;
b-2	border-width:2rpx;border-style:solid;
border-dashed	border-style:dashed
rounded-1_2 rounded-1/2 rounded-half	border-radius:50%
rounded-md	border-radius:12rpx

预设

export const borderRadius = {
  'DEFAULT': '8rpx',
  'none': '0',
  'sm': '4rpx',
  'md': '12rpx',
  'lg': '16rpx',
  'xl': '24rpx',
  '2xl': '32rpx',
  '3xl': '48rpx',
  'half': '50%',
  'full': '9999px',
}

---

border-color

class	Properties
border-red-100 border-red-1	--un-border-opacity:1; border-color:rgba(254,226,226,var(--un-border-opacity))
border-opacity-20 border-op-20	--un-border-opacity:0.2
border-black_10 border-black/10 border-black:10	border-color:rgba(0,0,0,0.1)

---

color

class	Properties
op-10 opacity-10	opacity:0.1
color-hex-157 c-hex-157 c-[#157]	--un-text-opacity:1;color:rgba(17,85,119,var(--un-text-opacity))
c-hex-157_10 c-hex-157/10 c-[#157]/10 c-[#157]:10 c-[#157]_10	color:rgba(17,85,119,0.1)
color-blue, color-blue-400, c-blue	--un-text-opacity:1;color:rgba(96,165,250,var(--un-text-opacity))
text-red-100 text-red100 text-red1	--un-text-opacity:1;color:rgba(254,226,226,var(--un-text-opacity))
text-red-100_20 text-red-100/20 text-red-100:20	color:rgba(254,226,226,0.2)

bg

class	Properties
bg-hex-452233_40 bg-[#452233]_40 bg-[#452233]/40 bg-[#452233]:40	background-color:rgba(69,34,51,0.4)
bg-red-100 bg-red1 bg-red100	--un-bg-opacity:1;background-color:rgba(254,226,226,var(--un-bg-opacity))
bg-teal-100_55 bg-teal-100/55 bg-teal-100:55	background-color:rgba(204,251,241,0.55)
bg-opacity-45	--un-bg-opacity:0.45

typography

class	Properties
text-base	font-size:32rpx;line-height:48rpx
text-100 text-size-100	font-size:100rpx
text-2em	font-size:2em
font-900, font-black fw-900	font-weight:900
font-leading-2 leading-2	line-height:16rpx
indent	text-indent:48rpx
indent-2	text-indent:16rpx
indent-1_2 indent-1/2 indent-1:2	text-indent:50%
indent-lg	text-indent:64rpx
text-shadow-lg	--un-text-shadow:6rpx 6rpx 12rpx var(--un-text-shadow-color, rgba(0,0,0,0.26)),0 0 10rpx var(--un-text-shadow-color, rgba(15,3,86,0.22));text-shadow:var(--un-text-shadow)
word-spacing-2	word-spacing:16rpx
tracking-2	letter-spacing:16rpx

fontSize预设  text-base

export const fontSize: Theme['fontSize'] = {
  'xs': ['24rpx', '32rpx'],
  'sm': ['28rpx', '40rpx'],
  'base': ['32rpx', '48rpx'],
  'lg': ['36rpx', '56rpx'],
  'xl': ['40rpx', '56rpx'],
  '2xl': ['48rpx', '64rpx'],
  '3xl': ['60rpx', '72rpx'],
  '4xl': ['72rpx', '80rpx'],
  '5xl': ['96rpx', '1'],
  '6xl': ['120rpx', '1'],
  '7xl': ['144rpx', '1'],
  '8xl': ['192rpx', '1'],
  '9xl': ['256rpx', '1'],
}
text-100 => font-size:100rpx

textIndent 预设  indent-lg

export const textIndent: Theme['textIndent'] = {
  'DEFAULT': '48rpx',
  'xs': '16rpx',
  'sm': '32rpx',
  'md': '48rpx',
  'lg': '64rpx',
  'xl': '80rpx',
  '2xl': '96rpx',
  '3xl': '128rpx',
}

leadings  tracking  word-spacing  indent 计算方式

indent-2 原为 text-indent: 0.5rem 等于 8px ,

小程序使用 750rpx 的基准是 2倍px 等于 16rpx ,

所以计算为 2*0.5*1rem = 2*0.5*16px = 16rpx

indent-2    
text-indent: 0.5rem 
text-indent: 16rpx

tracking-2    
letter-spacing: 0.5rem  
letter-spacing:16rpx

word-spacing-2   
word-spacing: 0.5rem  
word-spacing:16rpx

leadings-2  
line-height: 0.5rem  
line-height:16rpx

spacing

class	Properties
p-2,p2	padding:16rpx
mx-2	margin-left:16rpx;margin-right:16rpx
-m-lg	margin:-36rpx
pl-10px	padding-left:10px
m-10rpx	margin:10rpx
> 预设

export const spacing = {
  'DEFAULT': '32rpx',
  'none': '0',
  'xs': '24rpx',
  'sm': '28rpx',
  'md': '36rpx',
  'lg': '40rpx',
  'xl': '48rpx',
  '2xl': '60rpx',
  '3xl': '72rpx',
  '4xl': '96rpx',
  '5xl': '120rpx',
  '6xl': '144rpx',
  '7xl': '192rpx',
  '8xl': '256rpx',
}

box-shadow

预设

export const boxShadow = {
  'DEFAULT': ['var(--un-shadow-inset) 0 1px 3px 0 rgba(0,0,0,0.1)', 'var(--un-shadow-inset) 0 1px 2px -1px rgba(0,0,0,0.1)'],
  'none': '0 0 rgba(0,0,0,0)',
  'sm': 'var(--un-shadow-inset) 0 1px 2px 0 rgba(0,0,0,0.05)',
  'md': ['var(--un-shadow-inset) 0 4px 6px -1px rgba(0,0,0,0.1)', 'var(--un-shadow-inset) 0 2px 4px -2px rgba(0,0,0,0.1)'],
  'lg': ['var(--un-shadow-inset) 0 10px 15px -3px rgba(0,0,0,0.1)', 'var(--un-shadow-inset) 0 4px 6px -4px rgba(0,0,0,0.1)'],
  'xl': ['var(--un-shadow-inset) 0 20px 25px -5px rgba(0,0,0,0.1)', 'var(--un-shadow-inset) 0 8px 10px -6px rgba(0,0,0,0.1)'],
  '2xl': 'var(--un-shadow-inset) 0 25px 50px -12px rgba(0,0,0,0.25)',
  'inner': 'inset 0 2px 4px 0 rgba(0,0,0,0.05)',
}

连体写法

flex gap

class	Properties
flex-basis-1_2	flex-basis:50%
flex-basis-2	flex-basis:16rpx
gap-4	grid-gap:32rpx;gap:32rpx
gap-x-2	grid-column-gap:16rpx;column-gap:16rpx;