iCloud UIDocument opening fails after update on iOS 13

Question

I have a simple UIDocument subclass with overriding load and contents functions.

Before updating on iOS 13 json document was saved in url "/private/var/mobile/Library/Mobile Documents/iCloud~appbundle/Documents/EFB7FCBA96684AC0B101E3CD829E6996.json"

In current iOS version 13.2.2 (after updating) this document does not open:

let cloudDocument: ICloudDocument = ICloudDocument(fileURL: url)
cloudDocument.open { (openSuccess) in
    if openSuccess {
        success()
    } else {
        // in my case openSuccess is false
        failure()
    }
}

Debug information.

After overriding handleError in ICloudDocument

override func handleError(_ error: Error, userInteractionPermitted: Bool) {     
    print("userInteractionPermitted - \(userInteractionPermitted)")
    print(error)
}

in console:

userInteractionPermitted - true
Error Domain=NSCocoaErrorDomain Code=256 "The file “EFB7FCBA96684AC0B101E3CD829E6996” couldn’t be opened." UserInfo={NSURL=file:///private/var/mobile/Library/Mobile%20Documents/iCloud~appbundle/Documents/EFB7FCBA96684AC0B101E3CD829E6996.json}

If I use cloudDocument.read method in ICloudDocument it works well with receiving data from file, but open throws the error.

DocumentState cloudDocument.documentState of document is closed.

File options:

> print(FileManager.default.isWritableFile(atPath: url.path))
true
> print(FileManager.default.isReadableFile(atPath: url.path))
true

URLResourceKeys:

URLResourceKey.ubiquitousItemIsUploadingKey - true
URLResourceKey.ubiquitousItemIsUploadedKey - false
URLResourceKey.ubiquitousItemUploadingErrorKey - nil
URLResourceKey.ubiquitousItemHasUnresolvedConflictsKey - false
URLResourceKey.isUbiquitousItemKey - true
URLResourceKey.ubiquitousItemDownloadingStatusKey - "NSURLUbiquitousItemDownloadingStatusCurrent"

I found one link about this problem without answer https://forums.developer.apple.com/thread/126889

Any ideas?

Answer 1

Restaring iOS solved this problem. I think that after updating into iOS 13 and migration, system needs additional reload.