Agent Skills

Skyline Worklet 动画系统技能。使用 worklet 函数、共享变量(SharedValue)、动画类型(timing/spring/decay)、Easing 缓动函数、组合动画和线程通信(runOnUI/runOnJS)开发高性能交互动画时使用此技能。适用于拖拽、手势跟随、弹簧回弹等需要 UI 线程直接响应的动画场景。触发关键词:worklet、worklet 动画、SharedValue、共享变量、timing、spring、decay、Easing、runOnUI、runOnJS、applyAnimatedStyle、交互动画、手势动画、UI 线程动画。

Install

npx skills add https://github.com/wechat-miniprogram/skyline-skills --skill skyline-worklet
SKILL.md

Worklet 动画系统

适用场景

  • 实现手势跟随、拖拽等交互动画
  • 使用 timing/spring/decay 创建动画效果
  • 通过 SharedValue 驱动节点样式变化
  • 组合多段动画(序列、重复、延迟)
  • 在 UI 线程和 JS 线程间传递数据

核心概念

双线程架构与 Worklet 的意义

小程序双线程架构中,UI 事件需跨线程传递到 JS 线程再回传,交互动画会有明显延迟。Worklet 动画让动画逻辑直接运行在 UI 线程,实现类原生动画体验。

三大核心概念

概念 说明 关键 API
worklet 函数 可运行在 JS 或 UI 线程的函数,顶部声明 'worklet' 指令 runOnUI(), runOnJS()
共享变量 跨线程同步的变量,通过 .value 读写 shared(), derived()
动画驱动 将 SharedValue 绑定到节点样式 applyAnimatedStyle()

基本流程

const { shared, timing } = wx.worklet

// 1. 创建共享变量
const offset = shared(0)

// 2. 绑定到节点样式(updater 为 worklet 函数)
this.applyAnimatedStyle('#box', () => {
  'worklet'
  return { transform: `translateX(${offset.value}px)` }
})

// 3. 修改值驱动动画
offset.value = timing(300, { duration: 200 })

文档索引

根据需求快速定位(路径相对于 references/):

我想要... 查阅文档
了解 worklet 架构和完整概念 core/worklet-overview.md
使用 SharedValue 和 DerivedValue base/shared-derived.md
在 worklet 中操作 scroll-view base/scroll-view-context.md
使用 timing/spring/decay 动画 animation/timing-spring-decay.md
查看 Easing 缓动函数 animation/easing.md
使用序列/重复/延迟组合动画 animation/combine-animation.md
了解 runOnUI/runOnJS 线程通信 tool/thread-communication.md

强制规则

MUST: worklet 函数必须声明 'worklet' 指令

// ✅ Correct
function handleGesture(evt) {
  'worklet'
  offset.value += evt.deltaX
}

// ❌ Incorrect - 缺少 'worklet' 指令,无法在 UI 线程执行
function handleGesture(evt) {
  offset.value += evt.deltaX
}

MUST: SharedValue 必须通过 .value 读写

// ✅ Correct
const offset = shared(0)
offset.value = 100

// ❌ Incorrect - 直接赋值会替换整个 SharedValue 对象
const offset = shared(0)
offset = 100

MUST: 访问非 worklet 函数必须使用 runOnJS

// ✅ Correct
function showModal(msg) {
  wx.showModal({ title: msg })
}
function handleTap() {
  'worklet'
  const fn = this.showModal.bind(this)
  runOnJS(fn)('hello')
}

// ❌ Incorrect - worklet 中直接调用普通函数
function handleTap() {
  'worklet'
  this.showModal('hello')
}

MUST: 页面方法必须通过 this.methodName.bind(this) 访问

// ✅ Correct
handleTap() {
  'worklet'
  const showModal = this.showModal.bind(this)
  runOnJS(showModal)(msg)
}

// ❌ Incorrect - 未 bind(this),this 指向丢失
handleTap() {
  'worklet'
  runOnJS(this.showModal)(msg)
}

MUST: Worklet 动画仅在 Skyline 渲染模式下可用

  • 确保 app.json 配置 "renderer": "skyline"
  • 确保开发者工具勾选「将 JS 编译成 ES5」

NEVER: 在 worklet 函数中直接调用 wx API

必须通过 runOnJS 回到 JS 线程。

NEVER: 通过解构 this.data 访问属性

会导致 Object.freeze 冻结 this.data,setData 将失效。

// ✅ Correct
handleTap() {
  'worklet'
  const msg = this.data.msg
}

// ❌ Incorrect - 解构会冻结整个 this.data
handleTap() {
  'worklet'
  const { msg } = this.data
}

Quick Reference

API 速查表

分类 API 说明
基础 shared(initialValue) 创建 SharedValue
基础 derived(updaterWorklet) 创建衍生值(类比 computed)
基础 cancelAnimation(sharedValue) 取消动画
动画 timing(toValue, options?, callback?) 时间曲线动画(默认 300ms)
动画 spring(toValue, options?, callback?) 弹簧物理动画
动画 decay(options?, callback?) 滚动衰减动画
组合 sequence(anim1, anim2, ...) 依次执行
组合 repeat(anim, reps, reverse?, callback?) 重复(负值=无限)
组合 delay(ms, anim) 延迟执行
工具 runOnUI(workletFn) 在 UI 线程执行
工具 runOnJS(normalFn) 回调 JS 线程

场景 → 方案映射

场景 推荐方案
点击后平滑移动 timing + Easing
手势松开回弹 spring
手势松开惯性滑动 decay + velocity
先移动再弹回 sequence(timing, spring)
循环脉动效果 repeat(timing, -1, true)
延迟后开始动画 delay(ms, timing/spring)

相关技能

场景 推荐技能 说明
手势组件 skyline-components pan/tap/long-press 手势处理
渲染引擎概览 skyline-overview Skyline 配置和迁移
样式开发 skyline-wxss WXSS 支持与差异
路由转场 skyline-route 自定义路由动画

References 目录结构

references/
├── animation/
│   ├── combine-animation.md
│   ├── easing.md
│   └── timing-spring-decay.md
├── base/
│   ├── scroll-view-context.md
│   └── shared-derived.md
├── core/
│   └── worklet-overview.md
└── tool/
    └── thread-communication.md

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