WeChat applet calls camera to take pictures

This time I will bring you the WeChat applet to call the camera to take pictures. What are the precautions for the WeChat applet to call the camera to take pictures. The following is a practical case, let’s take a look.

In some check-in scenarios, in order to prevent users from selecting photos in the album or not taking pictures in real time, the camera is set to count down and automatically take pictures.

1. The first is the view layer index.wxml. The view layer is mainly responsible for displaying components and pictures.

<!--index.wxml-->
 <view class="userinfo-login">
  <view class="page-body">
   <view class="page-body-wrapper">
    <view wx:if="{{src}}"></view> 
    <!-- 如果存在已经拍好的照片就不再显示调用摄像头的组件-->
    <view wx:else>
     <camera device-position="back" flash="off" binderror="error" style="width: 100%; height: 200px;"></camera>
    <!-- 调用摄像头的组件-->
</view>
    <image wx:if="{{src}}" mode="widthFix" src="{{src}}"></image>
    <!-- 显示拍好的照片-->
    </view>
  </view>
 </view>

2. Logical layer index.js, calls the countdown function and calls the camera to take pictures and save the pictures.

//index.js
const app = getApp()
Page({
 data: {
  userInfo: {},
  counting: false//倒计时
 },
 onLoad: function () {
  this.daojishi();//一进来就拍照倒计时
  this.ctx = wx.createCameraContext()//创建摄像头对象
 },
 //倒计时
 daojishi: function () {
  var that = this;
  if (!that.data.counting) {
   //开始倒计时5秒
   countDown(that, 5);
  }
 }
})
//倒计时函数 在page外
function countDown(that, count) {
 if (count == 0) {
  //等于0时拍照 
  that.ctx.takePhoto({
   quality: 'high',
   success: (res) => {
    that.setData({
     src: res.tempImagePath
    })
    wx.showToast({
     title: '拍照完成',
    })
   }
  })
  that.setData({
   counting: false
  })
  return;
 }
 wx.showLoading({//加载时显示倒计时
  title: '拍照倒计时'+count+'秒',
 })
 setTimeout(function () {
  wx.hideLoading()
 }, 1000)
 that.setData({
  counting: true,
 })
 setTimeout(function () {
  count--;
  countDown(that, count);
 }, 1000);
}

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

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