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小程序实现身份证取景框拍摄


身份证取景框的实现主要是借助于camera 组件及cover-view组件
先看下案例
在这里插入图片描述
wxml代码

<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>

js代码

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) {
    wx.showModal({
      title: '提示',
      content: '该功能仅供演示,不会上传图片信息,请放心使用!!!',
    })
  },

  /**
   * 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 () {
    
  }
})

css 代码

.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%;
}

更多小程序开发案例请关注微信小程序【插件集】,项目地址:
https://github.com/yancekang/wechat-plug.git

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