Swift: PhotoLibrary delete assets and get progress

Question

I need to show progress of deleting photos and videos from photo library. In case of few photos - deletion can take few seconds but in case of 1000 photos - it will take few minutes. So, i need to show a progress somehow. How can I do that?

My code

    PHPhotoLibrary.shared().performChanges({
        PHAssetChangeRequest.deleteAssets(assets as NSFastEnumeration)
    }, completionHandler: { success, error in
        DispatchQueue.main.async {
        if let error = error {
            print(error.localizedDescription)
        }
        }
    })

Answer 1

You can register a PHPhotoLibraryChangeObserver to, as the name suggests, observe changes to the photo library. You can read more about it here.

When the PHPhotoLibraryChangeObserver notices a change, you can then request the details for that change to find out what to do, in this case you'd upload your user interface.

You can read more about PHPhotoLibraryChangeObserver here.

EDIT: As a response to the comment stating that this observer doesn't fire often enough for UI state updates, you could try a different approach, like querying all photos periodically (maybe every few seconds on a repeating timer) and then getting the count of the result. Then when the operation (in this case, deleting the items) is finished you can invalidate the timer.