If you have a class that uses NSURLConnectionDataDelegate and does asynchronous work via the NSURLConnectionDataDelegate methods
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- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response; - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data; - (void)connectionDidFinishLoading:(NSURLConnection *)connection; ....etc |
do not pair it with GCD because it itself is a separate worker thread that does the connections for you. Hence use NSURLConnection async by itself.
If you use NSURLConnection sync version, then you can use it with GCD.