Problem

I am using AFNetworking , which generates an NSURLConnection object to load a photo.

NSURLConnection does not make any calls to

- (void)connection:(NSURLConnection __unused *)connection
   didSendBodyData:(NSInteger)bytesWritten
 totalBytesWritten:(NSInteger)totalBytesWritten
totalBytesExpectedToWrite:(NSInteger)totalBytesExpectedToWrite

      

        
        
        
      

    

method. (This is part of the NSURLConnectionDataDelegate protocol defined in NSURLConnection.h)

The request is an HTTP POST request with photos attached (Content-Disposition "form-data", Mime type "image / jpeg"). This should (I think) result in periodic calls to this method as the download progresses.

I need a method to display a progress bar to the user. However, the method was not called.

Note:

• The delegate is set correctly; other delegate methods are called
• File upload successfully

AFNetworking code

I'm pretty sure this is an NSURLConnection issue and not an AFNetworking issue.

But just in case, here's the relevant code from my subclass AFHTTPClient

:

NSMutableURLRequest *request = [self multipartFormRequestWithMethod:@"POST" path:path parameters:parameters constructingBodyWithBlock:constructor];
AFHTTPRequestOperation *operation = [self HTTPRequestOperationWithRequest:request success:success failure:failure];

if (constructor) {
    [operation setUploadProgressBlock:^(NSUInteger bytesWritten, long long totalBytesWritten, long long totalBytesExpectedToWrite) {
        NSLog(@"Sent %lld of %lld bytes", totalBytesWritten, totalBytesExpectedToWrite);
    }];
}

[self enqueueHTTPRequestOperation:operation];

      

        
        
        
      

    

My AFHTTPClient subclass DOES NOT override ANY of the methods I call:

• multipartFormRequestWithMethod: path: parameters: constructingBodyWithBlock:
  
  
• HTTPRequestOperationWithRequest: success: failure:
  
  
• setUploadProgressBlock:
  
  
• enqueueHTTPRequestOperation:
  
  

constructor

is a block with a type (void (^)(id<AFMultipartFormData>))

and not nil

(checked by going through the code).

When I type po operation.uploadProgress

in the debugger I see $0 = 0x1301d9f0 <__NSMallocBlock__: 0x1301d9f0>

, so I think the block is set up correctly.

The file always uploads successfully, but the code in the upload progress block does not run, so the progress bar is never updated.

Questions

Why is NSURLConnection not calling this method?

What are the circumstances in which NSURLConnection is intended? (It does not appear to be documented.)

Most importantly, how can I show the download progress to the user?