Asynchronous NSURLConnection with NSOperation

     When I work on NSURLConnection with NSOperation today, I alloc a NSURLConnection like this

NSURLConnection* connection = [[NSURLConnection alloc]  initWithRequest:urlRequest delegate:self]; And implements the delegate methods, but it seems that those methods are not called at all. I search the problem in stackOverflow  for some time and find a blog(here) that helps me know and solve the issue. "If you are performing this on a background thread, the thread is  probably exiting before the delegates can be called." So I follow codes in that blog and modify code in my NSOperation object  to keep the runloop form exiting is to just put it in an infinite loop: - (void) start {   if (![self isCancelled])   {     connection_ = [[NSURLConnection alloc] initWithRequest:                            [NSURLRequest requestWithURL:download_.url                             cachePolicy:NSURLRequestReloadIgnoringLocalCacheData                            timeoutInterval:15] delegate:self];      if (connection_ != nil)         {        [self willChangeValueForKey:@"isExecuting"];        executing_ = YES;        [self didChangeValueForKey:@"isExecuting"];      }         else      {              [self willChangeValueForKey:@"isExecuting"];        finished_ = YES;        [self didChangeValueForKey:@"isExecuting"];      }      while(!finished_)      {        [[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode                                 beforeDate:[NSDate distantFuture]];      }    }   else   { // If it's already been cancelled, mark the operation as finished.     [self willChangeValueForKey:@"isFinished"];      {        finished_ = YES;      }      [self didChangeValueForKey:@"isFinished"];    } } This works well now :) ------ My new business with my wife, wholesale meddle-to-high end men's seamless underwear in the Netherlands: https://ecosharelife.com