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# progressHandler

A block that Photos calls periodically while downloading the image.

```
var progressHandler: PHAssetImageProgressHandler? { get set }
```

## Discussion

If you request an image whose data is not on the local device, and you have enabled downloading with the [`isNetworkAccessAllowed`](/documentation/Photos/PHImageRequestOptions/isNetworkAccessAllowed) property, Photos calls your block periodically to report progress and to allow you to cancel the download.

---

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