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前言

Uniapp 实现微信小程序滑动面板功能详解

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一、功能概述

滑动面板是移动端常见的交互组件，通常用于在页面底部展开内容面板。本文将介绍如何使用 Uniapp 开发一个支持手势滑动的底部面板组件，实现以下核心功能：
触摸滑动调整面板高度
边界限制
与地图组件的层级适配

二、实现思路

使用 Uniapp 框架实现跨平台兼容
通过 CSS transform 实现动画效果
基于微信小程序触摸事件体系
结合选择器 API 获取元素尺寸
触摸事件监听：捕获 touchstart/touchmove/touchend 事件
滑动距离计算：通过 clientY 坐标差值计算滑动距离
边界限制：确保面板在允许的高度范围内滑动
弹性动画：使用 CSS transition 实现平滑过渡
层级管理：通过 z-index 控制与其他组件的层级关系

三、代码实现

<template><viewclass="slider-panel"@touchstart="handleTouchStart"@touchmove.stop.prevent="handleTouchMove"@touchend="handleTouchEnd":style="{'min-height': `${initialPosition}px`,transform: `translateY(${translateY}px)`}"><view class="slider-panel-handle"></view><view class="slider-panel-content"><slot></slot></view></view>
</template>
<script>
export default {name: 'SliderPanel',props: {initialPosition: {type: Number,default: 100},deltaYThreshold: {type: Number,default: 100}},data() {return {isDragging: false,startY: 0,translateY: 0,panelHeight: 0,panelInitialShowHeight: 0}},async mounted() {const { height } = await this.getSelectorRect('.slider-panel-content')this.panelHeight = heightif (this.initialPosition > this.panelHeight) {this.panelInitialShowHeight = this.panelHeight} else {this.panelInitialShowHeight = height - this.initialPositionthis.translateY = this.panelInitialShowHeight}},methods: {getSelectorRect(selector) {const query = wx.createSelectorQuery().in(this)return new Promise((resolve) => {query.select(selector).boundingClientRect((rect) => {resolve(rect)}).exec()})},handleTouchStart(event) {const { clientY } = event.touches[0]this.isDragging = truethis.startY = clientY},handleTouchMove(event) {if (this.isDragging) {const { clientY } = event.touches[0]const deltaY = clientY - this.startYthis.startY = clientYthis.translateY += deltaYif (this.translateY < 0) {this.translateY = 0}if (this.translateY > this.panelInitialShowHeight) {this.translateY = this.panelInitialShowHeight}}},handleTouchEnd() {this.isDragging = false}}
}
</script><style scoped lang="scss">
.slider-panel {position: fixed;width: 100%;box-sizing: border-box;left: 0;bottom: 0;background: #fff;padding: 20rpx;border-radius: 24px 24px 0 0;box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.1);z-index: 30;will-change: transform;.slider-panel-handle {width: 60rpx;height: 6rpx;border-radius: 3rpx;background: #f0f0f0;margin: 16rpx auto 24rpx;}
}
</style>

<template><view class="container"><map style="width: 100%; height: 100%" :enable-scroll="false"></map><slider-panel><view v-for="item in 20" :key="item"><view class="item">{{ item }}</view></view></slider-panel></view>
</template>
<script>
import SliderPanel from '@/components/sliderPanel'
export default {components: {SliderPanel},data() {return {}},methods: {}
}
</script><style lang="scss">
page {height: 100%;width: 100%;
}
</style><style scoped lang="scss">
.container {position: relative;height: 100%;width: 100%;overflow: hidden;.item {display: flex;align-items: center;justify-content: center;border-bottom: 1px solid #ccc;height: 80rpx;}
}
</style>

总结

通过 Uniapp 开发滑动面板组件，可以有效实现跨平台兼容。核心在于：
正确处理触摸事件流
合理使用 CSS 动画
精确控制滑动边界
做好性能优化