Set progress bar for downloading NSData

Question

NSURL *url = [NSURL URLWithString:@\"http://i0.kym-cdn.com/entries/icons/original/000/005/545/OpoQQ.jpg?1302279173\"]; 
NSData *data = [NSData dataWithContentsOfURL:url]         


        

Answer 1

You can't get progress call backs by using that method.

You need to use an NSURLConnection and NSURLConnectionDataDelegate.

The NSURLConnection then runs asynchronously and will send callbacks to its delegate.

The main ones to look at are...

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response;
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error;
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data;

and

- (void)connectionDidFinishLoading:(NSURLConnection *)connection;

These are all used for getting the connection to do what you're already doing.

EDIT

Actually, see Marc's answer below. It is correct.