小程序的一个扫码页面，扫码界面一直开着，同时可以处理其他功能，如下：
由于直接调用微信的scanCode，无法自定义界面，所以只能使用原生组件camera，完成这个功能，关于扫描框的四个角的图片，就自己画一下吧，中间的移动横线，使用了小程序的动画功能，在原生camera组件上，覆盖需要用到cover-view和cover-image，同时加入了提示音
/**scan.wxss**/
.scan-view {
width: 100%;
height: 100%;
display: flex;
flex-direction: column;
background-color: #B9BEC4;
position: fixed;
align-items: center;
justify-content: space-around;
}
.scan-border {
width: 94%;
height: 94%;
border: 6rpx solid #08FDFE;
border-radius: 10rpx;
display: flex;
flex-direction: column;
align-items: center;
}
.scan-camera {
width: 500rpx;
height: 500rpx;
border-radius: 6rpx;
margin: 30rpx;
}
.cover-corner {
width: 80rpx;
height: 80rpx;
position: absolute;
}
.cover-left-top {
left: 0;
top: 0;
}
.cover-right-top {
right: 0;
top: 0;
}
.cover-left-bottom {
left: 0;
bottom: 0;
}
.cover-right-bottom {
right: 0;
bottom: 0;
}
.scan-animation {
position: absolute;
top: -10rpx;
left: 10rpx;
width: 480rpx;
height: 8rpx;
background-color: #08FDFE;
border-radius: 50%;
}
<!--scan.wxml-->
<view class="scan-view">
<view class='scan-border'>
<camera class='scan-camera' mode="scanCode" binderror="cameraError" bindscancode='scancode' frame-size='large'>
<cover-image class='cover-corner cover-left-top' src='/images/left-top.png'></cover-image>
<cover-image class='cover-corner cover-right-top' src='/images/right-top.png'></cover-image>
<cover-image class='cover-corner cover-left-bottom' src='/images/left-bottom.png'></cover-image>
<cover-image class='cover-corner cover-right-bottom' src='/images/right-bottom.png'></cover-image>
<cover-view class='scan-animation' animation="{{animation}}"></cover-view>
</camera>
<!-- 这里可以处理其他内容 -->
</view>
</view>
// scan.js
// 移动动画
let animation = wx.createAnimation({});
// 提示音
let innerAudioContext = wx.createInnerAudioContext()
innerAudioContext.src = '/images/beep.mp3'
Page({
data: {
},
onLoad: function () {
},
onShow(){
this.donghua()
},
donghua(){
var that = this;
// 控制向上还是向下移动
let m = true
setInterval(function () {
if (m) {
animation.translateY(250).step({ duration: 3000 })
m = !m;
} else {
animation.translateY(-10).step({ duration: 3000 })
m = !m;
}
that.setData({
animation: animation.export()
})
}.bind(this), 3000)
},
scancode(e){
// 提示音
innerAudioContext.play()
// 校验扫描结果，并处理
let res = e.detail.result
}
})
