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uniapp 生成商品分享通用海报源码，使用canvas生成海报，圆片加圆角，标题换行显示两排 多余点点，兼容H5端和小程序端。
组件显示代码<template><view><uni-popup ref="popup" type="center" class="poster-alert"><view class="poster"><image :src="poster" @longpress="saveImg"></image></view><view class="hm row-center"><view class="item" @tap="shareWx"><button open-type="share" class="sharebtn"><image :src="util.ossimg('button-wechat.png')"></image></button><text>微信</text></view> <!-- #ifdef MP-WEIXIN --><view class="item" @tap="saveImg"><view class="sharebtn"><image :src="util.ossimg('button-save.png')"></image></view><text>保存图片</text></view><!-- #endif --></view> </uni-popup></view>
</template><script>export default{name:'GoodsPoster', //商品分享海报 data(){return{poster:'',}},methods:{show(){this.$refs.popup.open();},close(){this.$refs.popup.close();},//分享微信好友shareWx(){},//保存图片async saveImg(){// #ifdef MP-WEIXINlet that = this;let imginfo = await uni.getImageInfo({src: that.poster })if(imginfo[1]){uni.saveImageToPhotosAlbum({filePath:imginfo[1].path,success() { that.tips.toast('保存成功') },fail(rej){ that.tips.toast('保存失败'); }})}// #endif },} }
</script><style lang="scss" scoped>.poster-alert{ width:520rpx;.poster{ width:520rpx; height:832rpx; overflow: hidden; background:#fff; border-radius:16rpx;}.hm{ margin-top:60rpx; .item{ text-align: center; margin:0 60rpx;.sharebtn{ background:none; border:0; padding:0; width:100rpx; height:100rpx; margin:0 auto; margin-bottom:12rpx;&:after{display:none;}image{ width:100rpx; height:100rpx; display:block; } }text{ font-size:24rpx; color:#fff;}}}}
</style>
海报生成代码<template><view> <!--分享海报--> <goods-poster ref="poster"></goods-poster><canvas canvas-id="mycanvas" class="mycanvas"></canvas> </view>
</template><script>import GoodsPoster from '@/components/Goods/GoodsPoster.vue'export default{components:{ GoodsPoster },data(){return{}},async onLoad() {this.create();}, methods:{ //生成圆形填充图片//参数：ctx:canvas, img:图片, x:距离X, y:距离Y, r:半径circleImg(ctx, img, x, y, r) {ctx.save();var d =2 * r;var cx = x + r;var cy = y + r;ctx.arc(cx, cy, r, 0, 2 * Math.PI);ctx.clip();ctx.drawImage(img, x, y, d, d);ctx.restore();},//圆角矩形填充图片// 参数：ctx: canvas, img:图片地址, x:距离X，y:距离Y, width:宽, height:高，radius:圆角大小drawRoundRectPath(ctx, img, x, y, width, height, radius) {ctx.save();ctx.translate(x, y);ctx.beginPath(0);ctx.arc(width - radius, height - radius, radius, 0, Math.PI / 2);ctx.lineTo(radius, height);ctx.arc(radius, height - radius, radius, Math.PI / 2, Math.PI);ctx.lineTo(0, radius);ctx.arc(radius, radius, radius, Math.PI, Math.PI * 3 / 2);ctx.lineTo(width - radius, 0);ctx.arc(width - radius, radius, radius, Math.PI * 3 / 2, Math.PI * 2);ctx.lineTo(width, height - radius);ctx.closePath();ctx.clip(); ctx.drawImage(img,0,0,uni.upx2px(460),uni.upx2px(460));ctx.restore();},// 文字自动换行// 参数：ctx:canvas, content:文字, drawX:距离X, drawY:距离Y, lineHeight: 行高, lineMaxWidth最大宽度, lineNum: 行数textPrewrap(ctx, content, drawX, drawY, lineHeight, lineMaxWidth, lineNum) {var drawTxt = ''; // 当前绘制的内容var drawLine = 1; // 第几行开始绘制var drawIndex = 0; // 当前绘制内容的索引// 判断内容是否可以一行绘制完毕if(ctx.measureText(content).width <= lineMaxWidth){ctx.fillText(content, drawX, drawY);} else {for (var i = 0; i < content.length; i++) {drawTxt += content[i];if (ctx.measureText(drawTxt).width >= lineMaxWidth) {if (drawLine >= lineNum) {ctx.fillText(content.substring(drawIndex, i) + '..', drawX, drawY);break;} else {ctx.fillText(content.substring(drawIndex, i + 1), drawX, drawY);drawIndex = i + 1;drawLine += 1;drawY += lineHeight;drawTxt = '';}} else {// 内容绘制完毕，但是剩下的内容宽度不到lineMaxWidthif (i === content.length - 1) {ctx.fillText(content.substring(drawIndex), drawX, drawY);}}}}}, //获取图片信息//微信:要下载远程图片到本地//H5远程图片时要将图片生成base64位,这个可让后台帮生成base64位，前端生成始终有跨域问题头疼, 另一种是将图片放在static目录async getimgInfo(path){// #ifdef MP-WEIXINconst info = await uni.downloadFile({url:path}) return info;// #endif // #ifdef H5const info = [{},{tempFilePath:'/static/img/p.png'}] return info;// #endif },//生成海报async create(){uni.showLoading({title:'海报生成中...'})let ctx = uni.createCanvasContext('mycanvas',this);ctx.fillStyle = "#fff"ctx.fillRect(0,0,uni.upx2px(520),uni.upx2px(845))//头像let head = "https://avatar.csdnimg.cn/8/C/D/0_u012015434.jpg";let headurl = await this.getimgInfo(head);headurl = headurl[1].tempFilePath;this.circleImg(ctx,headurl,uni.upx2px(30),uni.upx2px(30),uni.upx2px(36))//姓名ctx.setFontSize(uni.upx2px(28))ctx.fillStyle = '#000';ctx.fillText("神夜大侠",uni.upx2px(115),uni.upx2px(55))//说明ctx.setFontSize(uni.upx2px(20))ctx.fillStyle = '#000';ctx.fillText("这件商品很棒，推荐给你看看",uni.upx2px(115),uni.upx2px(85))//logolet logo = "https://avatar.csdnimg.cn/8/C/D/0_u012015434.jpg";let logourl = await this.getimgInfo(logo);logourl = logourl[1].tempFilePath;ctx.drawImage(logourl,uni.upx2px(410),uni.upx2px(35),uni.upx2px(80),uni.upx2px(40))//商品图let img = "https://avatar.csdnimg.cn/8/C/D/0_u012015434.jpg";let imgurl = await this.getimgInfo(img);imgurl = imgurl[1].tempFilePath;this.drawRoundRectPath(ctx,imgurl,uni.upx2px(30),uni.upx2px(120),uni.upx2px(460),uni.upx2px(460),uni.upx2px(16)); //商品标题ctx.setFontSize(uni.upx2px(24))ctx.fillStyle = '#333';this.textPrewrap(ctx,"这是商品标题名称商品标题名称",uni.upx2px(30),uni.upx2px(670),uni.upx2px(36),uni.upx2px(250),2);//价格ctx.setFontSize(uni.upx2px(22))ctx.fillStyle = this.config.webColor;ctx.fillText("￥",uni.upx2px(30),uni.upx2px(760))ctx.setFontSize(uni.upx2px(36))ctx.fillStyle = this.config.webColor;ctx.fillText("58.00",uni.upx2px(50),uni.upx2px(760))//二维码let ewm = 'https://avatar.csdnimg.cn/8/C/D/0_u012015434.jpg';let ewmurl = await this.getimgInfo(ewm);ewmurl = ewmurl[1].tempFilePath;ctx.drawImage(ewmurl,uni.upx2px(339),uni.upx2px(620),uni.upx2px(150),uni.upx2px(150))//扫码购买ctx.setFontSize(uni.upx2px(20))ctx.fillStyle = "#333";ctx.fillText("-扫码购买商品-",uni.upx2px(347),uni.upx2px(800)) ctx.draw();setTimeout(()=>{uni.canvasToTempFilePath({canvasId:'mycanvas',success:res=>{this.$refs.poster.poster = res.tempFilePath;this.$refs.poster.show();uni.hideLoading();},fail:err=>{this.tips.toast('海报生成失败')uni.hideLoading();}})},500) }, }}
</script><style lang="scss" scoped> .mycanvas{ width:520rpx; height:845rpx; background:#fff; position: fixed; bottom:1000px; border-radius:16rpx;}
</style>
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