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推荐整理分享用uniapp实现微信小程序的电子签名效果(uniapp仿微信),希望有所帮助,仅作参考,欢迎阅读内容。
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画布可以做很多事情,比如可以绘图,也可以做海报。在这里只是想拿它来的实现亲笔签名,开启不一样的亲笔签名姿势。
开发框架:uniapp 开发语言:vue2 展示平台:微信小程序(实际可以兼容多个平台)
标签和样式没什么好说的,这里绘制了简单的页面,见下图:
1、标签和样式<template><view class="page-content"><view class="form"><view class="form-content"><canvas class="form-content__canvas" canvas-id="canvas_sign" @touchstart="touchstart"@touchmove="touchmove" @touchend="touchend" disable-scroll="true"></canvas></view><view class="form-footer"><button class="form-footer__reset" @click="autographClick(1)">重置</button><button class="form-footer__save" @click="autographClick(2)">保存</button><button class="form-footer__preview" @click="autographClick(3)">预览</button></view></view></view></template><style lang="scss" scoped>/** 横屏后的适配方案* @param $rpx为需要转换的字号* @参考 https://blog.csdn.net/sdfsfsdscd/article/details/91375066**/@function tovmin($rpx) {@return #{$rpx * 100 / 750}vmin;}.page-content {width: 100vw;height: 100vh;.form {display: flex;flex-direction: column;width: 100%;height: 100%;.form-content {width: 100%;height: 100%;&__canvas {height: calc(100vh - tovmin(20) - tovmin(120) - constant(safe-area-inset-bottom));height: calc(100vh - tovmin(20) - tovmin(120) - env(safe-area-inset-bottom));width: 100vw;}}.form-footer {padding-top: tovmin(20);height: calc(tovmin(120) + constant(safe-area-inset-bottom));height: calc(tovmin(120) + env(safe-area-inset-bottom));width: 100%;display: flex;flex-direction: row;background: #FFFFFF;box-shadow: 0 tovmin(4) tovmin(20) tovmin(2) rgba(183, 183, 183, 0.20);button {width: 20vw;height: tovmin(88);line-height: tovmin(88);border-radius: tovmin(48);text-align: center;font-size: tovmin(36);font-weight: bold;}button::after {border: none;}&__reset {color: #008AFE;border: tovmin(1) solid #008AFE;}&__save {background-image: linear-gradient(135deg, #1BC5FF 0%, #008AFE 100%);}&__preview {color: #008AFE;border: tovmin(1) solid #008AFE;}}}}</style>2、横屏切换到【pages.json】文件中添加横屏切换配置 注意:不同的平台横屏切换将有所不一样。这里是针对微信小程序的横屏适配
{"pages": [ //pages数组中第一项表示应用启动页,参考:https://uniapp.dcloud.io/collocation/pages{"path": "pages/index/index","style": {"navigationBarTitleText": "亲笔签名",//导航栏标题"pageOrientation": "landscape",//切换横屏"enablePullDownRefresh": false,//关闭下拉刷新"disableScroll": true // 整体页面禁止上下滑动}}],"globalStyle": {"navigationBarTextStyle": "black","navigationBarBackgroundColor": "#FFFFFF","backgroundColor": "#f5f5f5","navigationStyle": "default", // default/custom。custom即取消默认的原生导航栏"mp-alipay": {"transparentTitle": "always","titlePenetrate": "YES"}}}然后是绘制逻辑处理,注意点在代码中备注:
3、绘图3.1、初始化数据会吧?data() {return {canvasCtx: '', //绘图图像points: [], //路径点集合hasSign: false,isInit: false,}},onLoad(query) {this.canvasCtx = uni.createCanvasContext('canvas_sign', this) //创建绘图对象//设置画笔样式this.canvasCtx.lineWidth = 6// 设置线条的端点样式this.canvasCtx.lineCap = 'round'// 设置线条的交点样式this.canvasCtx.lineJoin = 'round'},3.2、触摸开始时获取起点,会吧?touchstart: function(e) {if (!this.isInit) {this.isInit = truethis.autographClick(1);}let startX = e.changedTouches[0].xlet startY = e.changedTouches[0].ylet startPoint = {X: startX,Y: startY}this.points.push(startPoint)//每次触摸开始,开启新的路径this.canvasCtx.beginPath()},3.3、触摸移动获取路径点,会吧?touchmove: function(e) {let moveX = e.changedTouches[0].xlet moveY = e.changedTouches[0].ylet movePoint = {X: moveX,Y: moveY}this.points.push(movePoint) //存点let len = this.points.lengthif (len >= 2) {this.draw() //绘制路径}},3.4、触摸结束,将未绘制的点清空防止对后续路径产生干扰,简单吧?touchend: function() {this.points = []this.canvasCtx.draw(true)},3.5、绘制笔迹,没得问题吧?这里有几个注意点:
1.为保证笔迹实时显示,必须在移动的同时绘制笔迹 2.为保证笔迹连续,每次从路径集合中区两个点作为起点(moveTo)和终点(lineTo) 3.将上一次的终点作为下一次绘制的起点(即清除第一个点)
draw: function() {let point1 = this.points[0]let point2 = this.points[1]this.points.shift()this.canvasCtx.moveTo(point1.X, point1.Y)this.canvasCtx.lineTo(point2.X, point2.Y)this.canvasCtx.stroke()this.canvasCtx.draw(true)this.hasSign = true},4、扫尾处理上面的实现了,说明就可以签下你大名了。这里扫尾工作(按钮点击功能实现)只是景上添花。根据实际情况不一定要做。
<script>export default {methods: {// 底部按钮点击操作autographClick(type) {let that = thisif (type === 1) {//清空画布this.hasSign = falseuni.getSystemInfo({success: function(res) {let canvas = uni.createSelectorQuery().select('.form-content__canvas')canvas.boundingClientRect().exec(function(data) {console.log('canvas', data)console.log('canvas wh:' + data[0].width + 'X' + data[0].height)let canvasw = Math.ceil(data[0].width)let canvash = Math.ceil(data[0].height)that.canvasCtx.fillStyle = '#fff'that.canvasCtx.fillRect(0, 0, canvasw, canvash)that.canvasCtx.draw(true)})}})} else {if (!this.hasSign) {uni.showToast({title: '签名不能为空',icon: 'none',duration: 2000})return}uni.getSystemInfo({success: function(res) {let canvas = uni.createSelectorQuery().select('.form-content__canvas')canvas.boundingClientRect().exec(function(data) {console.log('canvas saveSign:', data[0].width + 'X' + data[0].height)let canvasw = Math.ceil(data[0].width)let canvash = Math.ceil(data[0].height)uni.canvasToTempFilePath({destWidth: canvasw,destHeight: canvash,fileType: 'jpg',canvasId: 'canvas_sign',success: function(res) {console.log('图片导出成功:', res)let path = res.tempFilePath// 保存图片if (type === 2) {that.uploadPic(path)} else if (type === 3) {// 预览图片uni.previewImage({urls: [path]})}},fail: (err) => {// http://tmp/2LVQyvzddk2R820a9009dff43323d8e7fc9ef7a8d076.jpgconsole.log('图片导出失败:', err)}})})}})}},// 图片上传处理uploadPic(tempFile) {// 1、将本地图片上传到服务器(假装是七牛云服务器)// 2、将七牛云返回的链接,上传到我们的服务器平台console.log("------:", tempFile);uni.showLoading({title: '正在上传中...'})setTimeout(() => {uni.showToast({title: '假装签名上传成功',duration: 2000,icon: 'none'});}, 1000);}}}</script>demo地址: 1、CSDN资源库地址:https://download.csdn.net/download/weixin_38633659/85343244 2、gitee地址:https://gitee.com/chenzm_186/autograph-mini.git
**🏆结束语🏆 **
🌹🌹:以上功能已全部实现,那么你想已怎么样的姿势开启你的亲笔签名模式呢?欢迎留言评论! 🌹🌹:最后如果觉得我写的文章对您有帮助的话,欢迎点赞✌,收藏✌,加关注✌哦,谢谢谢谢!!
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