var type: ModelType?
    var data: PHAsset?
   init(type: ModelType?,data:PHAsset?){
        self.type = type
        self.data = data
    }
      static func ==(lhs: customModel, rhs: customModel) -> Bool {
        return lhs.type == rhs.type && lhs.data == rhs.data
   }}```
实现 Equatable的协议
在检测重复图片时，for循环遍历时 不要将插入操作放入遍历中，不然超级卡顿，访问相册时卡的原因 我遇到的就是这个原因
  ```  for  model in  selectModel{
            if  model == newmodel{
                return
           }
       selectModel.insert(newmodel, at: 0)
}```
存入系统相册
``` func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
       let   img  = info[ UIImagePickerControllerOriginalImage] as!  UIImage       
       PHPhotoLibrary.shared().performChanges({
        let   req = PHAssetChangeRequest.creationRequestForAsset(from: img)  self.cameraidentitifer.append((req.placeholderForCreatedAsset?.localIdentifier)
       }) { (success, err) in
        if success {
            //  加上这句 可以秒刷新视图
            DispatchQueue.main.async {
                self.updateCameraimgs()
            }
        }
       }
        //   将资源放入 当前的cell中
        dismiss(animated: true, completion: nil）
    }```

//根据localindentity更新内容
```  if  self.cameraidentitifer.count == 0 {
            return
        }
        let   fetchresult = PHAsset.fetchAssets(withLocalIdentifiers: self.cameraidentitifer, options: nil)
  fetchresult.enumerateObjects({ (assert,pos, stop) in
            var  phasets = [PHAsset]()
            phasets.append(assert)
  //  加上这句 可以秒刷新视图
            DispatchQueue.main.async {
                self.onImageSelectFinished(images: phasets)
                self.cameraidentitifer.removeAll()
            }
        })```