微信小程序实现自定义摄像头（在摄像头内添加提示信息）

摄像头组件（wxml）

<!-- 拍照功能 自定义摄像头
          bindtap：takePhotoDepot----从图库获取
          bindtap：takePhoto----拍照
          bindtap：takeFrontBack---转换摄像头
 -->

<view wx:if="{
  
   {useCameraTakePhoto}}" class="scan_view">
	<!-- 摄像头组件 -->
    <camera device-position="back" mode="normal" flash="off" binderror="error" device-position="{
  
   {phopo_camera?'front':'back'}}" style="width: 100%; height: 100vh;">
      <!-- 摄像头返回按钮 -->
       <cover-view class="camera_view">
         <cover-view class="back" bindtap="closeCamera">
           返回
         </cover-view>
         <cover-view style="overflow: hidden;margin-top: 80vh;">
           <cover-image bindtap="takePhotoDepot" class="take_photo_depot"src="../../images/phopo.png"></cover-image>
            <cover-image bindtap="takePhoto" class="take_photo" src="../../images/starCamera.png"></cover-image>
            <cover-image bindtap="takeFrontBack" class="take_photo_frontBack" src="../../images/transition.png"></cover-image>
          </cover-view>
        </cover-view>
      </camera>
    </view>

唤醒摄像头组件（wxml）

<view class="conPhopo_camera" bindtap="changePhoto">
        <text>拍摄照片</text>
</view>

自定义展示拍照后的图片（wxml）

<view style="width:100%; overflow: hidden;" wx:if="{
  
   {tempFileList.length>0}}">
<!-- 图片缩小状态  -->
        <view style="position: relative;width: 80rpx;height: 120rpx;float: left;margin-right: 10rpx; margin-top: 10rpx;" wx:for="{
  
   {tempFileList}}" wx:key="index">
          <view class="fileShow" wx:if="{
  
   {item.type ==='image' && item.thumb}}">  
            <image style="display: inline-block;width: 80rpx;height: 120rpx; " src="data:image/png;base64,{
  
   {item.thumb}}" alt="" bindtap="changeMinImage" data-item="{
  
   {item}}" data-index="{
  
   {index}}" data-src='{
  
   {item.thumb}}' data-thumb='true' />
          </view>
          <view class="fileShow" wx:elif="{
  
   {item.type ==='image' &&item.path}}">
            <image style="display: inline-block;width: 80rpx;height: 120rpx; margin-top: 10rpx;" src="{
  
   {item.path}}" alt="" bindtap="changeMinImage" data-item="{
  
   {item}}" data-index="{
  
   {index}}" data-src='{
  
   {item.path}}' />
          </view>
        </view> 
<!-- 点击缩小图片放大展示-->
      <view wx:if="{
  
   {isSrc}}" style="position: absolute;left:0;top: 0; width: 100vw;height: 100vh;background-color: rgba(0, 0, 0, 0.8);padding-top: 20%;">
          <view wx:if="{
  
   {thumb=='true'}}">
            <image style="display: block; width: 80%;height: 80%;margin: 0 auto;opacity: 1; background-color: #09ce9a;" src="data:image/png;base64,{
  
   {src.src}}" alt="" />
          </view>
          <view wx:elif="{
  
   {thumb!='true'}}">
            <image style="display: block; width: 80%;height: 80%;margin: 0 auto;opacity: 1; background-color: aqua;" src="{
  
   {src.src}}" />
          </view>
          <i class="iconfont .icon-quxiao" bindtap="changeMaxImage" style="position: absolute;left: 20rpx;top: 20rpx;color: #fff;font-size: 44rpx;"></i>
        </view> 
</view>

接下来就是关键了，主要还得看js怎么实现

实现的方法

打开摄像头并且拍照

  // 控制摄像头是否显示
  changePhoto(e) {
   
    
    const {
   
    
      currentTab,
      isVideoModel,
    } = this.data;
     let casePhotoList = this.data.casePhotoList; 
     let facePhotoList = this.data.facePhotoList;
     let abnormalPhotoList = this.data.abnormalPhotoList; 
     let accessoryPhotoList = this.data.accessoryPhotoList; 
    const that = this;
    if (currentTab == 2) {
   
    
        // 摄像开始
      wx.chooseVideo({
   
    
        count: 1,
        mediaType: ['video'],
        sourceType: ['camera'],
        success: (res) => {
   
    
          // 添加formData
          let formData = new FormData();
          formData.append('type', currentTab);
          let src = {
   
    
            tempVideoPath: res.tempFilePath,
            size: res.size
          };
          abnormalPhotoList.push(src);
          that.setData({
   
    
            abnormalPhotoList: abnormalPhotoList,
            useCameraTakePhoto: false,
            isVideoModel: !isVideoModel,
          });
          for (const iterator of abnormalPhotoList) {
   
    
            formData.appendFile('files[]', iterator.tempVideoPath);
          }
          let tempFilesPath = abnormalPhotoList.map(item => ({
   
    
            type: item.type ? item.type : 'video', // 文件类型
            path: item.tempVideoPath, // 文件本地路径
            size: item.size ? item.size : '', // 文件大小
          }))
          let {
   
    
            videoTempFileList
          }