Question

I have an app that presents Table View of different files. I have it set up to Asynchronously download, and would like to have the selected cell show a progress bar. I’ve looked online all afternoon, and everything I have found so far seems real incomplete on how to do this. Here is my code so far for the download, and set up to have a progressview show download status.

Code:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
RSSEntry *entry = [_allEntries objectAtIndex:indexPath.row];
NSURL *url = [NSURL URLWithString:entry.articleUrl];    
self.nameit = entry.articleTitle;
NSURLRequest *theRequest = [NSURLRequest requestWithURL:url         cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:60];   
receivedData = [[NSMutableData alloc] initWithLength:0];
NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self     startImmediately:YES];
}
- (void) connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
progress.hidden = NO;
[receivedData setLength:0];
expectedBytes = [response expectedContentLength];
}

- (void) connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
[receivedData appendData:data];
float progressive = (float)[receivedData length] / (float)expectedBytes;
[progress setProgress:progressive];


}

 - (void) connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
[connection release];
}

- (NSCachedURLResponse *) connection:(NSURLConnection *)connection willCacheResponse:    (NSCachedURLResponse *)cachedResponse {
  return nil;
}

- (void) connectionDidFinishLoading:(NSURLConnection *)connection {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *pdfPath = [documentsDirectory stringByAppendingPathComponent:[currentURL stringByAppendingString:@".mp3"]];
NSLog(@"Succeeded! Received %d bytes of data",[receivedData length]);
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
[receivedData writeToFile:pdfPath atomically:YES];
progress.hidden = YES;
[connection release];
}

Answer 1

First, add an UIProgressView variable to you interface, so that you can reference to it from any method in your class.

Then, when user selects it. you have to initialize it

 - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{

    UITableViewCell *cell =[tableView cellForRowAtIndexPath:indexPath];

    progress = [[UIProgressView alloc]initWithProgressViewStyle:UIProgressViewStyleBar];
    progress.frame = CGRectMake(10, 10, 30, 30);
    progress.progress = 0.0;

    progress.center = CGPointMake(23,21);

    [cell.contentView addSubview:progress];


}

Now you can update a progressBar as the file downloads and after it just send[progress removeFromSuperView]

That’s it!