iOS Asynchronously Downloading MP3s

[newtoiphonesdk]

I am having issues getting this accomplished correctly. I have a Table View Controller that parses the XML of the podcast loaded with MP3s. On my did select row, I have:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
RSSEntry *entry = [_allEntries objectAtIndex:indexPath.row];
    NSURL *url = [NSURL URLWithString:entry.articleUrl];    
        NSLog(@"%@", url);
NSURLRequest *theRequest = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:60];
receivedData = [[NSMutableData alloc] initWithLength:0];
NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self startImmediately:YES];
}

The only warning that I get is that connection is unused, but I am trying to set it up the same way the Apple documentation has it. I then have the following methods implemented:

- (void) connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
    [UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
    [receivedData setLength:0];
}

- (void) connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    [receivedData appendData:data];
}

- (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 {
    [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
    [connection release];
}

When I click on the row, the NSLog returns

2012-03-12 12:33:42.154 SMCoC[11283:17f03] http://www.smcoc.net/content/audio/sermons/2012/2012_03_11am_the_big_hunt.mp3#!111433318

When I click the row, networkActivityIndicator starts spinning, and goes for a little while and then stops. I also have a Second Table View for the Saved MP3s, where files is a NSMutableArray:

- (void)viewWillAppear:(BOOL)animated {
	NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
	NSString *documentsDirectoryPath = [paths objectAtIndex:0];
	NSFileManager *manager = [NSFileManager defaultManager];
	self.title = @"Saved Sermons";
	self.files = [[manager contentsOfDirectoryAtPath:documentsDirectoryPath error:nil] retain];
	
	
	
	self.navigationItem.rightBarButtonItem = self.editButtonItem;
	[self.tableView reloadData];
    [super viewDidLoad];
    [super viewWillAppear:animated];
	
}

And for the Rows in Table:

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    // Return the number of rows in the section.
    return [self.files count];
}


// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
	
	
	
	
	
    static NSString *CellIdentifier = @"Cell";
	
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
    }
	
	cell.textLabel.text = [self.files objectAtIndex:indexPath.row];
	UIFont *cellFont = [UIFont fontWithName:@"AmericanTypewriter-Bold" size:17];    
    cell.textLabel.font = cellFont;
   	return cell;  
}

However, when I go to that Saved Table View, nothing appears. Am I doing something obviously wrong that the file is not actually downloading?

 

[Bankerts]

I believe you forgot one key piece: when the data is done downloading, you need to write to the device.

add:

[receivedData writeToFile:localFilename atomically:YES];

to the connectionDidFinishLoading method.

 

[newtoiphonesdk]

I believe you forgot one key piece: when the data is done downloading, you need to write to the device.

add:

[receivedData writeToFile:localFilename atomically:YES];

to the connectionDidFinishLoading method.

Of course...wow. One other question. Some of these files are quite large, and can take a bit of time. I will be learning to add a UIProgressView, but had a question first about download limits. I know that in the Review guidelines, apple states that when streaming stuff, it can't download more than 5 MB in 5 minutes. Does the same rule apply for Asynchronous downloads using NSURLConnection? If so, how in the world are we to download anything over 5MB on a cell connection?