Rename an iCloud document - ios

Question

The problem
What I have so far is code that creates a new local file and deletes the iCloud file.
Is it possible to rename an iCloud document, so that it stays in iCloud?
GarageBand can do it. It's possible to rename an iCloud song. After the rename is done, the song is still in iCloud. However GarageBand is an Apple app, so it may use private apis.
My current code:
- (void)moveFrom:(NSURL*)sourceURL
moveTo:(NSString*)destinationName
completion:(void (^)())completion
{
MyDocument *document = [[MyDocument alloc] initWithFileURL:sourceURL];
[document openWithCompletionHandler:^(BOOL success)
{
NSURL *fileURL = [self.localRoot URLByAppendingPathComponent:destinationName];
DLog(#"Create %#", fileURL);
[document saveToURL:fileURL
forSaveOperation:UIDocumentSaveForCreating
completionHandler:^(BOOL success)
{
NSLog(#"Saved %#", fileURL);
[document closeWithCompletionHandler:^(BOOL success) {
// Delete the old document from a secondary thread
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^()
{
NSFileCoordinator* fileCoordinator = [[NSFileCoordinator alloc] initWithFilePresenter:nil];
[fileCoordinator coordinateWritingItemAtURL:sourceURL
options:NSFileCoordinatorWritingForDeleting
error:nil
byAccessor:^(NSURL* writingURL) {
NSFileManager* fileManager = [[NSFileManager alloc] init];
[fileManager removeItemAtURL:writingURL error:nil];
DLog(#"Deleted %#", sourceURL);
completion();
}];
});
}];
}];
}];
}
Update: Still no luck
I have found out that -setUbiquitous:itemAtURL:destinationURL:error: cannot be used for renaming documents.
If I invoke [setUbiquitous:NO itemAtURL:oldLocalURL destinationURL:newLocalURL error:&error] on an already local file, then:
Error Domain=NSCocoaErrorDomain Code=512 "The operation couldn’t be
completed. (Cocoa error 512.)" UserInfo=0x1fdf6730
{NSURL=file://localhost/var/mobile/Applications/4BABA000-B100-49FC-B928-B0F403FC75FF/Documents/LocalDrawing.td2/,
NSUnderlyingError=0x20940e80 "The operation couldn’t be completed.
(LibrarianErrorDomain error 2 - Cannot disable syncing on a unsynced
item.)"}
If I invoke [setUbiquitous:YES itemAtURL:oldCloudURL destinationURL:newCloudURL error:&error] on an already cloud file, then:
Error Domain=NSCocoaErrorDomain Code=512 "The operation couldn’t be
completed. (Cocoa error 512.)" UserInfo=0x208e9820
{NSURL=file://localhost/var/mobile/Library/Mobile%20Documents/22DR89XVRF~com~opcoders~triangle-draw/Documents/CloudDrawing.td2/,
NSUnderlyingError=0x208d45b0 "The operation couldn’t be completed.
(LibrarianErrorDomain error 2 - Cannot enable syncing on a synced
item.)"}
Thus -setUbiquitous:itemAtURL:destinationURL:error: cannot be used for renaming documents.

Answer 1

I have finally solved it. This is my code so far:
- (void)_moveURL:(NSURL*)sourceURL
destURL:(NSURL*)destinationURL
success:(void (^)())successBlock
failure:(void (^)(NSError *))failureBlock
{
NSParameterAssert(sourceURL);
NSParameterAssert(destinationURL);
NSParameterAssert(successBlock);
NSParameterAssert(failureBlock);
// Do the actual renaming
__block NSError *moveError = nil;
__block BOOL moveSuccess = NO;
void (^accessor)(NSURL*, NSURL*) = ^(NSURL *newURL1, NSURL *newURL2) {
NSFileManager *fileManager = [[NSFileManager alloc] init];
moveSuccess = [fileManager moveItemAtURL:sourceURL toURL:destinationURL error:&moveError];
};
// Coordinate renaming
NSError *coordinatorError = nil;
NSFileCoordinator *coordinator = [[NSFileCoordinator alloc] initWithFilePresenter:nil];
[coordinator coordinateWritingItemAtURL:sourceURL
options:NSFileCoordinatorWritingForMoving
writingItemAtURL:destinationURL
options:NSFileCoordinatorWritingForReplacing
error:&coordinatorError
byAccessor:accessor];
if (moveSuccess) {
successBlock();
return;
}
if (moveError) {
failureBlock(moveError);
return;
}
if (coordinatorError) {
failureBlock(coordinatorError);
return;
}
NSAssert(NO, #"should not happen");
}

Answer 2

There is an easier way to rename item at any given URL, including iCloud URLs.
url.setResourceValue(newName, forKey: NSURLNameKey)
I am using this in my cocoa app's production code.
Edit:
In Swift 5, this looks a little different, but still works well:
var resourceValues = URLResourceValues()
resourceValues.name = newName
try previousFileURL.setResourceValues(resourceValues)