Cannot sync simple text file with iCloud (bad file descriptor) - ios

Question

I'm having trouble synching a simple textfile, I get this error when trying to open it:
{NSFilePath=/private/var/mobile/Library/Mobile Documents/4C224W52W5~com~piso13~opusDomini/currentLogPath, NSUnderlyingError=0xde9b460 "The operation couldn’t be completed. Bad file descriptor"}
This is how I create it
-(BOOL)createLogFolderFile{
NSString *uuid = nil;
CFUUIDRef uuidRef = CFUUIDCreate(nil);
uuid = (NSString*)CFUUIDCreateString(nil, uuidRef);
CFRelease(uuidRef);
NSError *error = nil;
[uuid writeToFile:[self filePath] atomically:NO encoding:NSUTF8StringEncoding error:&error];
if (error) {
NSLog(#"Error trying to create log file %#", error);
return FALSE;
}
else{
return TRUE;
}
}
-(NSString*)filePath{
NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *iCloudPath = [[fileManager URLForUbiquityContainerIdentifier:nil] path];
return [iCloudPath stringByAppendingPathComponent:LOG_FOLDER_FILE_NAME];
}
This is how I read it:
-(NSString*)readLogFolderFromFile{
NSError *error = nil;
NSString *logFolder = [NSString stringWithContentsOfFile:[self filePath] encoding:NSUTF8StringEncoding error:&error];
if (error) {
NSLog(#"Error when trying to read log folder from file: %#" ,error);
return nil;
}
else{
return logFolder;
}
}
I'm using NSMetadataQuery to search for the file,
The notification query finish gathering info results positive.
Help?

Answer 1

The file was not downloaded. It seems NSMetadataQuery notifies about the existence of the file in the cloud. To actually get the file, extra code is needed:
Inside queryDidFinishGathering notification:
NSMetadataItem *item = [query resultAtIndex:0];
self.metadataItem = item;
BOOL isDownloaded = [[item valueForAttribute:NSMetadataUbiquitousItemIsDownloadedKey]boolValue];
if (!isDownloaded) {
NSError *error = nil;
[[NSFileManager defaultManager] startDownloadingUbiquitousItemAtURL: [item valueForAttribute:NSMetadataItemURLKey] error:&error];
NSLog(#"Start downloading file");
if (error) {
NSLog(#"Error trying to download file: %#", error);
}
else{
[self lookForLogFolderFile];
return;
}
}
The lookForLogFolderFile simply starts the query again.
After several calls my item gets downloaded. You can also use a timer to between each call to start a NSMetadataQuery. In my case, is just a text file with one line.