Switching to AFNetworking from ASIHTTPRequest - Issue with ASINetworkQueue - objective-c

Question

I'm working on a problem where I have to download around 10 different large files in a queue, and I need to display a progress bar indicating the status of the total transfer. I have this working just fine with ASIHTTPRequest in iOS4, but I'm trying to transition to AFNetworking since ASIHTTPRequest has issues in iOS5 and is no longer maintained.
I know you can report progress on individual requests using AFHTTPRequestOperation's downloadProgressBlock, but I can't seem to find a way to report overall progress of multiple requests that would be executed on the same NSOperationQueue.
Any suggestions? Thanks!

Answer 1

[operation setUploadProgressBlock:^(NSInteger bytesWritten, NSInteger totalBytesWritten, NSInteger totalBytesExpectedToWrite) {
NSLog(#"Sent %d of %d bytes", totalBytesWritten, totalBytesExpectedToWrite);
}];
Operation is AFHTTPRequestOperation

Answer 2

You can subclass AFURLConnectionOperation to have 2 new properties: (NSInteger)totalBytesSent, and (NSInteger)totalBytesExpectedToSend. You should set these properties in the NSURLConnection callback like so:
- (void)connection:(NSURLConnection *)__unused connection
didSendBodyData:(NSInteger)bytesWritten
totalBytesWritten:(NSInteger)totalBytesWritten
totalBytesExpectedToWrite:(NSInteger)totalBytesExpectedToWrite
{
[super connection: connection didSendBodyData:bytesWritten totalBytesWritten:totalBytesWritten totalBytesExpectedToWrite:totalBytesExpectedToWrite];
self.totalBytesSent = totalBytesWritten;
self.totalBytesExpectedToSend = totalBytesExpectedToSend;
}
Your uploadProgress block may look like this:
……(NSInteger bytesWritten, NSInteger totalBytesWritten, NSInteger totalBytesExpectedToWrite) {
NSInteger queueTotalExpected = 0;
NSInteger queueTotalSent = 0;
for (AFURLConnectionOperation *operation in self.operationQueue) {
queueTotalExpected += operation.totalBytesExpectedToSend;
queueTotalSent += operation.totalBytesSent;
}
self.totalProgress = (double)queueTotalSent/(double)queueTotalExpected;
}];

Answer 3

I would try subclassing UIProgressView with a subclass that keeps track of all the different items you are watching and then has logic that adds the progress of them all together.
With code like this perhaps:
#implementation customUIProgressView
-(void) updateItem:(int) itemNum ToPercent:(NSNumber *) percentDoneOnItem {
[self.progressQueue itemAtIndexPath:itemNum] = percentDoneOnItem;
[self updateProgress];
}
-(void) updateProgress {
float tempProgress = 0;
for (int i=1; i <= [self.progressQueue count]; i++) {
tempProgress += [[self.progressQueue itemAtIndexPath:itemNum] floatValue];
}
self.progress = tempProgress / [self.progressQueue count];
}