Usually, my code is ok to download the files from iCloud. But sometimes the downloading process will not be updated.
Following are some code snips:
start download:
NSFileManager* fm = [NSFileManager defaultManager];
if (![fm startDownloadingUbiquitousItemAtURL:file error:nil]) {
return NO;
}
/////////////////////////
id query = [[icloudClass alloc] init];
_query = query;
[query setSearchScopes:[NSArray arrayWithObject:NSMetadataQueryUbiquitousDocumentsScope]];
NSArray *listItems = [[file path] componentsSeparatedByString:@"/"];
NSPredicate *pred = [NSPredicate predicateWithFormat: @"%K == %@", NSMetadataItemFSNameKey, [listItems objectAtIndex:[listItems count] -1] ];
NSLog(@"filename = %@", [listItems objectAtIndex:[listItems count] -1]);
[query setPredicate:pred];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(updateDownloading:) name:NSMetadataQueryDidUpdateNotification object:query];
[query startQuery];
update download:
-(void)updateDownloading:(NSNotification *)notification {
id query = [notification object];
if ([query resultCount] /*>=*/ == 1) {
for (int i=0; i<[query resultCount]; ++i) {
NSMetadataItem *item = [query resultAtIndex:i];
//debug
NSNumber* isDownloading = [item valueForAttribute:NSMetadataUbiquitousItemIsDownloadingKey];
NSNumber* isDownloaded = [item valueForAttribute:NSMetadataUbiquitousItemIsDownloadedKey];
NSNumber* perDownloading = [item valueForAttribute:NSMetadataUbiquitousItemPercentDownloadedKey];
NSLog(@"isDownloaded=%@", [isDownloaded boolValue]?@"Yes":@"No");
NSLog(@"isDownloading=%@", [isDownloading boolValue]?@"Yes":@"No");
NSLog(@"percent downloaded=%f", [perDownloading doubleValue]);
//
if ([isDownloaded boolValue]) {
[query disableUpdates];
[query stopQuery];
[[NSNotificationCenter defaultCenter] removeObserver:self name:NSMetadataQueryDidUpdateNotification object:query];
_query = nil;
NSLog(@"----------end download!------------------");
}
}//end for
}
}
please note that the update function will only be invoked once with the following console print, and never will be invoked even restart the app.
Jan 10 15:20:27 unknown *[1383] <Warning>: isHasConflict=No
Jan 10 15:20:27 unknown *[1383] <Warning>: isDownloaded=No
Jan 10 15:20:27 unknown *[1383] <Warning>: isDownloading=No
Jan 10 15:20:27 unknown *[1383] <Warning>: percent downloaded=0.000000
Does anyone met this problem before?