微信小程序实现身份证取景框拍摄

本文实例为大家分享了微信小程序实现身份证取景框拍摄的具体代码，供大家参考，具体内容如下

wxml

<view class="camera_box">
 <camera class="camera" wx:if="{{!show}}" device-position="back" flash="off" binderror="error">
  <cover-view class="id_m">
   <cover-image class="img" src="https://cdn.ctoku.com/201910234221235312.png"></cover-image>
  </cover-view>
 </camera>
 <image class="camera_img" src="{{src}}" wx:if="{{show}}"></image>
 <view class="action">
  <button class="takeBtn" type="primary" bindtap="takePhoto" wx:if="{{!show}}"></button>
  <button class="saveImg" type="primary" bindtap="saveImg" wx:if="{{show}}"></button>
  <button class="cancelBtn" wx:if="{{show}}" type="primary" bindtap="cancelBtn"></button>
 </view>
</view>

wxss

.camera_box {
 height: 100vh; width: 100vw;
 position: relative;
}
.camera {
 height: 85vh; width: 100vw;
 z-index: 1;
}
.id_m {
 height: 85vh; width: 100vw;
 z-index: 999;
 background: rgba(0, 0, 0, 0.1);
 display: flex;
 position: absolute;
}
.id_m .img {
 width: 550rpx;
 height: 900rpx;
 display: block;
 position: absolute;
 left: 0; right: 0; margin: auto auto;
 top: 0; bottom: 0;
}
.id_m .tips_txt {
 transform:rotate(90deg);
}
.camera_box .action {
 height: 15vh;
 position: relative;
 display: flex;
 justify-content: space-around;
 align-items: center;
}
.camera_box .takeBtn {
 height: 120rpx; width: 120rpx; border-radius: 50%;
 font-size: 24rpx;
 background: url('https://cdn.ctoku.com/1123123123123e3241.png') no-repeat center;
 background-size: contain;
 border: none;
}
.camera_box .cancelBtn {
 font-size: 24rpx;
 height: 120rpx; width: 120rpx; border-radius: 50%;
 background: url('https://cdn.ctoku.com/12311123342312231.png') no-repeat center;
 background-size: contain;
 border: none;
}
.camera_box .saveImg {
 background: url('https://cdn.ctoku.com/1232123434231231231.png') no-repeat center;
 font-size: 24rpx;
 height: 120rpx; width: 120rpx; border-radius: 50%;
 background-size: contain;
 border: none;
}
.camera_box .takeBtn::after {
 border: none;
}

.camera_img {
 height: 85vh; width: 100%;
}

js

Page({

 /**
  * 页面的初始数据
  */
 data: {
  src: '',
  show: false
 },
 cancelBtn () {
  this.setData({show: false})
 },
 saveImg () {
  wx.showModal({
   title: '图片地址',
   content: this.data.src,
  })
 },
 takePhoto() {
  const ctx = wx.createCameraContext()
  const listener = ctx.onCameraFrame((frame) => {
   console.log(frame)
  })
  ctx.takePhoto({
   quality: 'high',
   success: (res) => {
    console.log(res)
    this.setData({
     src: res.tempImagePath,
     show: true
    })
    listener.stop({
     success: (res) => {
      console.log(res)
     },
     fail: (err) =>{
      console.log(err)
     }
    })
   },
   fail: (err) => {
    console.log(err)
   }
  })
 },
 error(e) {
  console.log(e.detail)
 },
 /**
  * 生命周期函数--监听页面加载
  */
 onLoad: function (options) {

 },

 /**
  * 生命周期函数--监听页面初次渲染完成
  */
 onReady: function () {

 },

 /**
  * 生命周期函数--监听页面显示
  */
 onShow: function () {

 },

 /**
  * 生命周期函数--监听页面隐藏
  */
 onHide: function () {

 },

 /**
  * 生命周期函数--监听页面卸载
  */
 onUnload: function () {

 },

 /**
  * 页面相关事件处理函数--监听用户下拉动作
  */
 onPullDownRefresh: function () {

 },

 /**
  * 页面上拉触底事件的处理函数
  */
 onReachBottom: function () {

 },

 /**
  * 用户点击右上角分享
  */
 onShareAppMessage: function () {

 }
})

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