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

'libxml/xmlversion.h' file not found

     In Xcode 4.2 and 4.3 when facing this error, you can do following setting to fix it.
     In your build settings, for the key "Header Search Paths", add

"$(SDK_DIR)"/usr/include/libxml2

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My new business with my wife, wholesale meddle-to-high end men's seamless underwear in the Netherlands: https://ecosharelife.com