antd-mobile 移动端使用ImagePicker手机上拍照后反显时图片会旋转90度问题

解决方案：

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<div style={{padding:'10px 0'}}>
  <span className={s.fileStyle}>
     <img src={this.state.imgSrc}  alt="" className={s.imgs} id='imgBox'/>
        <ImagePicker
           length={1}
           files={this.state.files}
           onChange={this.onChange}
           onImageClick={(index, fs) => console.log(index, fs)}
           selectable={true}
           accept="image/gif,image/jpeg,image/jpg,image/png"
           disableDelete
     />
　　</span>
</div>
//js代码
onChange = (files, type, index) => {
   console.log(files, type, index);
   if (type == 'add') {
     this.setState({
       files,
     });
     var file=files[files.length - 1].file;
     const windowURL = window.URL || window.webkitURL;//实现预览
     var u = navigator.userAgent;
     var isiOS = !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/);
     var isAndroid = u.indexOf('Android') > -1 || u.indexOf('Adr') > -1; //android终端
     if(isiOS){
          console.log('ios');
          console.log(file.size/1024+'kb')
          const isLt400K = file.size /1024 < 200;
          if(!isLt400K){
            return this.getsmallpic(file)
          }else{
            this.setState({
              imgArr:files[files.length - 1].file,
              imgSrc:files[files.length - 1].url
            })
          }
        }else if(isAndroid){
          console.log('Android');
          var that=this;
          this.rotateImg(files[files.length - 1].file).then(blob => {
            document.getElementById('imgBox').src = URL.createObjectURL(blob) // 转换后的img
            this.blobToDataURL(blob, function(dataurl) {
              console.log(file.size/1024+'kb')
              const isLt400K = file.size /1024 < 200;
              if(!isLt400K){
                return that.getsmallpic(that.dataURLtoFile(dataurl,file.name))
              }else{
                this.setState({
                  imgArr:files[files.length - 1].file
                })
              }
            });
          });
        }else{
          console.log('pc')
          console.log(file.size/1024+'kb')
          const isLt400K = file.size /1024 < 200;
          if(!isLt400K){
            return this.getsmallpic(file)
          }else{
            this.setState({
              imgArr:files[files.length - 1].file,
              imgSrc:files[files.length - 1].url
            })
          }
        }
      }
    }
  blobToDataURL(blob, callback) {
    var a = new FileReader();
    a.onload = function(e) {
      callback(e.target.result);
    }
    a.readAsDataURL(blob);
    return a;
  }
  
//图片翻转
   rotateImg(file) {
    return new Promise((resolve, reject) => {
      let img = new Image();
      img.src = window.URL.createObjectURL(file);
      img.onload = () => {
        util.addScript('https://cdn.jsdelivr.net/npm/exif-js', () => {
          var EXIF=window.EXIF;
          // 获取图片源数据 上面已经引入EXIF全局变量
          EXIF.getData(img, function () {
            // 获取图片orientation值
            console.log(EXIF.getAllTags(this))
            let orientation = EXIF.getTag(this, "Orientation");
            let canvas = document.createElement("canvas");
            let ctx = canvas.getContext("2d");
            switch (orientation) {
              case 3: // 旋转180°
                canvas.width = img.width;
                canvas.height = img.height;
                ctx.rotate((180 * Math.PI) / 180);
                ctx.drawImage(img, -img.width, -img.height, img.width, img.height);
                break;
              case 6: // 旋转90°
                canvas.width = img.height;
                canvas.height = img.width;
                ctx.rotate((90 * Math.PI) / 180);
                ctx.drawImage(img, 0, -img.height, img.width, img.height);
                break;
              case 8: // 旋转-90°
                canvas.width = img.height;
                canvas.height = img.width;
                ctx.rotate((-90 * Math.PI) / 180);
                ctx.drawImage(img, -img.width, 0, img.width, img.height);
                break;
              default: // 没有源信息的图片和正常的图片是不需要旋转的
                canvas.width = img.width;
                canvas.height = img.height;
                ctx.drawImage(img, 0, 0, img.width, img.height);
                break;
            }
            // 处理完返回 (这里返回都是被压缩的，根据实际情况更改正常的图片处理方式)
            canvas.toBlob(file => resolve(file), 'image/jpeg', 0.8)
          })
        });
      }
    })
  }
　//图片压缩
  dataURLtoFile(dataurl, filename) {
      var arr = dataurl.split(','), mime = arr[0].match(/:(.*?);/)[1],
        bstr = atob(arr[1]), n = bstr.length, u8arr = new Uint8Array(n);
      while(n--){
        u8arr[n] = bstr.charCodeAt(n);
      }
      return new File([u8arr], filename, {type:mime});
    }
    // 图片压缩
    getsmallpic(file){
      return new Promise((resolve,reject)=>{
        //对图片进行压缩
        const reader = new FileReader()
        const image = new Image()
        image.onload = (imageEvent) => {
          const canvas = document.createElement('canvas');
          const context = canvas.getContext('2d');
          const width = image.width * 0.5
          const height = image.height * 0.5
          canvas.width = width;
          canvas.height = height;
          context.clearRect(0, 0, width, height);
          context.drawImage(image, 0, 0, width, height);
          const dataUrl = canvas.toDataURL(file.type);
          const blobData = this.dataURLtoFile(dataUrl,file.name);
          if(blobData){
            if(blobData.size /1024 < 400){
              Object.assign(blobData,{uid:blobData.lastModified});
              const windowURL = window.URL || window.webkitURL;//实现预览
              resolve(blobData)
              this.setState({
                imgSrc:windowURL.createObjectURL(blobData)
              })
              this.setState({
                imgArr:blobData
              })
            }else{
              this.getsmallpic(blobData)
            }
  
          }else{
            reject()
          }
  
        }
        reader.onload = (e => { image.src = e.target.result; });
        reader.readAsDataURL(file);
      })
    }
  
//css片段
  
.fileStyle{
  position: relative;
  display: block;
  width: 160px;
  height: 160px;
  border-radius: 50%;
  text-align: center;
  background: #f5f5f5;
  margin: 0 auto;
  border: 1px solid #0486FE;
  overflow: hidden;
}
.imgs {
  width: 160px !important;
  height: 160px !important;
  border-radius: 50%;
  position: relative;
}
.fileStyle input {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 9;
  width: 160px;
  height: 160px;
  opacity: 0;
}
:global(.am-image-picker .am-image-picker-list .am-flexbox){
  width: 165px !important;
  height: 165px !important;
  border-radius: 50%;
  position: absolute;
  top:0;
  left: 0;
  background-color: transparent!important;
}
:global(.am-image-picker-list){
  padding: 0 0 0 0!important;
  margin-bottom: 0!important;
}
:global(.am-image-picker-upload-btn){
  border-radius: 50% !important;
  border: 0 !important;
}
:global(.am-image-picker-list .am-image-picker-item .am-image-picker-item-content){
  border-radius: 50% !important;
  border: 0 !important;
}
:global(.am-image-picker-list .am-image-picker-item){
  opacity: 0!important;
}