小编能力有限，如有错误希望大佬指点（复制可直接使用以组件的形式）
①组件
主要是通过uniapp自带的画布组件，通过鼠标事件，最后转成base64实现
<template>
<view>
<view class="box" :style="{height:height}">
<view class="top">
<canvas class="canvas-box" @touchstart='touchstart' @touchmove="touchmove" @touchend="touchend"
canvas-id="myCanvas">
</canvas>
<view>请在此处签名</view>
</view>
<view class=" bottom">
<u-tag text="完成" mode="dark" @click="finish" />
<u-tag text="重签" mode="dark" @click="clear" />
</view>
</view>
</view>
</template>
<script>
export default {
data() {
return {
ctx: '', //绘图图像
points: [], //路径点集合
height: '10px', //高度
canvasShoww: false, //提示
isDraw: false,
}
},
created() {
let that = this
uni.getSystemInfo({
success: function(res) {
that.height = res.windowHeight + 'px';
},
});
},
mounted() {
this.createCanvas()
},
methods: {
//创建并显示画布
createCanvas() {
this.ctx = uni.createCanvasContext('myCanvas', this); //创建绘图对象
//设置画笔样式
this.ctx.lineWidth = 4;
this.ctx.lineCap = 'round';
this.ctx.lineJoin = 'round';
},
// 触摸开始
touchstart(e) {
this.isDraw = true
let startX = e.changedTouches[0].x;
let startY = e.changedTouches[0].y;
let startPoint = {
X: startX,
Y: startY
};
this.points.push(startPoint);
//每次触摸开始，开启新的路径
this.ctx.beginPath();
},
// 移动
touchmove(e) {
let moveX = e.changedTouches[0].x;
let moveY = e.changedTouches[0].y;
let movePoint = {
X: moveX,
Y: moveY
};
this.points.push(movePoint); //存点
let len = this.points.length;
if (len >= 2) {
this.draw(); //绘制路径
}
},
// 触摸结束，将未绘制的点清空防止对后续路径产生干扰
touchend(e) {
this.points = [];
},
//绘制笔迹
draw() {
let point1 = this.points[0];
let point2 = this.points[1];
this.points.shift();
this.ctx.moveTo(point1.X, point1.Y);
this.ctx.lineTo(point2.X, point2.Y);
this.ctx.stroke();
this.ctx.draw(true);
},
//清空画布
clear() {
let that = this;
if (this.imageShow) {
if (this.imageUrl) {
this.imageUrl = '';
this.imageShow = false;
}
} else {
uni.getSystemInfo({
success: function(res) {
// 设置画笔样式
let canvasw = res.windowWidth;
let canvash = res.windowHeight;
that.ctx.clearRect(0, 0, canvasw, canvash);
that.ctx.draw(true);
}
});
}
this.createCanvas();
},
//完成绘画并保存到本地
finish() {
if (this.isDraw) {
let that = this;
uni.canvasToTempFilePath({
canvasId: 'myCanvas',
success: function(res) {
that.imageShow = true;
that.imageUrl = res.tempFilePath;
that.$emit('change', res.tempFilePath);
}
}, );
return
}
this.$u.func.showToast({
title: '请签名',
})
},
}
}
</script>
<style lang="scss" scoped>
.box {
width: 100%;
display: flex;
flex-direction: column;
background-color: #fff;
.top {
height: 95%;
margin: 50rpx;
border: 1px solid #000;
position: relative;
.canvas-box {
width: 100%;
height: 100%;
}
}
.bottom {
height: 5%;
display: flex;
align-items: flex-start;
justify-content: space-around;
}
}
</style>
②使用以及引入
<template>
<view>
<sign @change="change"></sign>
</view>
</template>
<script>
import sign from '@/components/sign/index.vue'//对应的组件存放地址
export default {
data() {
return {
}
},
components: {
sign
},
methods: {
// 用户签名数据
change(e) {
console.log(e)//获取到base64的图片信息，可实现上传到服务器
//可结合使用uni.uploadFile()实现上传
},
}
}
</script>