fileImporter download progress from files in iCloud Drive

Question

Created Sep ’21

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I'm using fileImporter for a Mac app. If I open a file from iCloud Drive that isn't already downloaded, I need to start the download before I can read the contents of the file. I found that I can download the file by using NSFileCoordinator or FileManager.default.startDownloadingUbiquitousItem.

These APIs will begin the download, but I have no updates on the progress or if the file has been downloaded. I've tried to use NSMetadataQuery with no luck.

Is there a way, either with fileImporter in SwiftUI or an AppKit API that I can receive updates for when a remote file has been downloaded, or do I need to prompt the users to download the file themselves before importing into my app?

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Answer 1

xinthesize OP

Oct ’23

It seems like you can read the download progress from the NSMetadataUbiquitousItemPercentDownloadedKey file metadata key.

You could probably initialize an NSMetadataItem using a URL object, then use the value(forAttribute:) function to fetch the download progress from 0.0 to 1.0.

NSMetadataUbiquitousItemPercentDownloadedKey: https://developer.apple.com/documentation/foundation/nsmetadataubiquitousitempercentdownloadedkey
NSMetadataItem: https://developer.apple.com/documentation/foundation/nsmetadataitem

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