UIDocument not saving to file despite indicating success

Question

I\'m trying to open, modify, and save a file in iCloud Drive using UIDocument. When I call save(to:for:completionHandler:) with the file location and u

Answer 1

The way the initial file generation works for me is:

    let doc = YourUIDocumentClass(fileURL: fileURL) 
    doc.save(to: fileURL, for: .forCreating) { success in
        ...            
    }

Then modify the file and then do:

    doc.save(to: fileURL, for: .forOverwriting)  { success in
        ...            
    }

when done. And subsequent accesses to the file are done by:

    doc.open() { success in
        ...
    }

    doc.close() { success in
        ...            
    }

You might also need to do a:

    doc.updateChangeCount(.done)

while the file is open to tell the document there are unsaved changes. Just setting this will cause a save after a few seconds. You don't even need the close to do that.

The ... means that you either have to nest all these or make sure there is enough time between them so they are completed.