How to tell if iCloud file has been downloaded?

Question

I have the following code. My goal is to decode the data once the file has been downloaded to the device. I used fileExists to check if the file existed on iCloud. And then startDownloadingUbiquitousItem to download it. But I can't figure out how to tell if it has been downloaded. May I ask if there is a way to tell its downloaded? Like a completion handler or notification?

            if paperyCloudURL != nil, FileManager.default.fileExists(atPath: paperyCloudURL!.path, isDirectory: nil) {
                try? FileManager.default.startDownloadingUbiquitousItem(at: paperyCloudURL!)
                //TODO: Should have check if the file exist before load
                let data = try Data(contentsOf: paperyCloudURL!)
                dataModel = try! decoder.decode(DataModel.self, from: data)
            }

Answer 1

You need to test the file NSMetadataQuery object key NSMetadataUbiquitousItemDownloadingStatusKey is set to NSMetadataUbiquitousItemDownloadingStatusCurrent .