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

"#333" p="x-6 y-10" w100 h200 class="li-bg-red">
  this is a unocss

transform

class="li-bg-red li-bg-#333 li-p-x-6 li-p-y-10 li-w100 li-200">
  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

<view class="bg-gradient-to-t from-#f39c12/60 via-#2ecc71:80 to-#9b59b6_70"></view>

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)',
      },
    },
  },
})
class="animate-pulse">
 
<view class="animate-back-in-down animate-iteration-infinite">view>
 
<view class="animate-[4s_linear_0s_infinite_alternate_bounce]">view>
 
.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)

width and height

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

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

---

color

bg

typography

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

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

<view class="shadow-[0px_4px_4px_0px_rgba(237,_0,_0,_1)]"></view>

flex gap