通过github链接进行下载,然后代码参考如下,功能包含了清空、判断签名内容是否为空、生成png/jpg图片等。
签名效果:
预览效果:
下载 smooth-signature 链接:https://github.com/linjc/smooth-signature
代码参考:
javascript
<template>
<div>
<div class="btn">
<button class="item" @click="submit">确定</button>
<button class="item" @click="clear">清空</button>
</div>
<canvas />
<u-toast ref="uToast" />
</div>
</template>
<script>
import SmoothSignature from "smooth-signature";
export default {
name: "handWriteSign",
data() {
return {
canvas: '',
options: {},
signature: ''
}
},
mounted() {
this.initSignature()
},
methods: {
initSignature() {
// 初始化
this.canvas = document.querySelector("canvas");
// 配置项
this.options = {
// 画布在页面实际渲染的宽度、高度
width: window.innerWidth,
height: window.innerHeight - 100,
// 画布缩放
scale: 2,
minWidth: 4,
maxWidth: 10,
color: '#000',
bgColor: '#fff'
};
this.signature = new SmoothSignature(this.canvas, this.options)
},
clear() {
this.signature.clear()
},
submit() {
// 判断签名内容是否为空
const isEmpty = this.signature.isEmpty();
if (isEmpty) {
return this.$refs.uToast.show({
title: '内容为空,请签名',
type: 'error'
})
}
// 生成旋转后的新画布 -90/90/-180/180
const canvas1 = this.signature.getRotateCanvas(-90)
const pngUrl = canvas1.toDataURL()
// let signPic = this.signature.getPNG()
console.log('signPic', pngUrl);
uni.setStorageSync('signPic', pngUrl)
if (pngUrl) {
uni.navigateBack({
delta: 1, // 返回的页面数,如果是1表示返回上一级
});
}
},
},
};
</script>
<style lang="scss">
.btn {
display: flex;
align-items: center;
height: 80px;
.item {
transform: rotate(90deg);
border-radius: 8px;
border: 1px solid #f0f0f0;
}
}
</style>
然后在要展示签名的页面:
js
// 每次进入页面时执行
onShow() {
this.img1 = uni.getStorageSync('signPic')
},
html
<image :src="img1" style="width: 100%;" mode="widthFix"></image>