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POUpdate UIProgressView in UICollectionViewCell for download file
 

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    <p>I'm trying to update the UIProgressView in UICollectionViewCell when I download a file, but sometime the progressView update and sometime doesn't update, and I can't understand why, this is the code to display the UICollectionViewCell:</p> <pre><code>-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath { static NSString *cellIdentifier = @"documentCell"; UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:cellIdentifier forIndexPath:indexPath]; NSManagedObject *doc = [self.magDocument objectAtIndex:indexPath.row]; UIButton *btn = (UIButton *)[cell viewWithTag:2003]; [btn addTarget:self action:@selector(addDocument:) forControlEvents:UIControlEventTouchUpInside]; UIProgressView *progressBar = (UIProgressView *)[cell viewWithTag:2005]; return cell; } </code></pre> <p>This is the button to start the download:</p> <pre><code>- (IBAction)addDocument:(id)sender { self.directCellPath = [self.myCollectionView indexPathForCell:(UICollectionViewCell *)[[sender superview] superview]]; NSManagedObject *document = [self.magDocument objectAtIndex:self.directCellPath.row]; [self loadLink:[document valueForKey:@"docUrl"]]; } - (void)loadLink:(NSString *)urlDownload { UICollectionViewCell *cell = (UICollectionViewCell *)[self.myCollectionView cellForItemAtIndexPath:self.directCellPath]; UIProgressView *prg = (UIProgressView *)[cell viewWithTag:2005]; AFDownloadRequestOperation *request = [[AFDownloadRequestOperation alloc] initWithRequest:requestUrl targetPath:zipDownloadPath shouldResume:YES]; [request setProgressiveDownloadProgressBlock:^(NSInteger bytesRead, long long totalBytesRead, long long totalBytesExpected, long long totalBytesReadForFile, long long totalBytesExpectedToReadForFile) { NSLog(@"%f",totalBytesReadForFile/(float)totalBytesExpectedToReadForFile); NSArray *progress = [NSArray arrayWithObjects:prg,[NSNumber numberWithFloat:totalBytesReadForFile/(float)totalBytesExpectedToReadForFile], nil]; [self performSelectorOnMainThread:@selector(updateProgressBar:) withObject:progress waitUntilDone:NO]; }]; [self.downloadQueue addOperation:request]; } - (void)updateProgressBar:(NSArray *)progress { UIProgressView *pgr = (UIProgressView *)[progress objectAtIndex:0]; [pgr setProgress:[[progress objectAtIndex:1] floatValue]]; } </code></pre> <p>One time the the progress view works, and other one thousand times doesn't work, I can't understand how update the progress view, any help?</p>
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