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I was curious if downloading ranges of a file would be faster than 1 request. At the same time I was curious about creating an AFNetworking "extension". Putting those two ideas together creates JJAFAcceleratedDownloadRequestOperation, a subclass of AFHTTPOperation that will break up a download request into multiple request "chunks" to download at the same time.

Here is a video of it in action:

JJAFAcceleratedDownloadRequestOperation video


Still a lot of work to do before this is fully useful.

  • Add Resume support for when the download is paused
  • Error handling for when the worst happens
  • Test with (and create progress view for) AppKit downloading on OS X
  • Lots of testing


This project also contains JJChunkedProgressView which allows you to update progress for different parts of a download operation. Potentially needs to be broken out into it's own project. It does support UIAppearance on:

@property (nonatomic, strong) UIColor *progressColor UI_APPEARANCE_SELECTOR;
@property (nonatomic, strong) UIColor *trackBorderColor UI_APPEARANCE_SELECTOR;
@property (nonatomic, strong) UIColor *trackBackgroundColor UI_APPEARANCE_SELECTOR;


This is built on top of the amazing AFNetworking library targeting the latest branch: tagged 1.0.1.


    // Setup Request
    NSURL *url = [NSURL URLWithString:@"<URL to big file>"];
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    // Setup Operation
    JJAFAcceleratedDownloadRequestOperation *operation = [[JJAFAcceleratedDownloadRequestOperation alloc] initWithRequest:request];
    [operation setMaximumChunkSize:JJAFAcceleratedDownloadChunkSizeRecommended];
    // Get Progress Updates
    [operation setProgressBlock:^(NSUInteger chunkIndex, NSUInteger bytesRead, long long totalBytesRead, long long totalBytesExpectedToRead){
        float percentDoneForChunk = ((float)((int)totalBytesRead) / (float)((int)totalBytesExpectedToRead));
        // Use the percentage
    [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
        // responseObject is NSData of the downloaded file
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        NSLog(@"Download Failed");

    [operation start];


As stated above, this is mostly an experimental project build out of curiosity. Probabably no where near ready for use in a production app. However, if you'd like to hack on it, please do and I'd be glad to check it out.


I've added some build tools using xcoder and rake that can help get you started and will soon be able to run some unit tests.

Rake is a ruby tool that can be installed on your machine. The best setup is to use bundler via:

`gem install bundle`

After cloning from github, cd into the project directory and run:

`bundle install`

Finally, setup the project by running:

`rake tools:setup`

Other commands available:

rake build:sample  # Build Sample



JJAFAcceleratedDownloadRequestOperation is available under the MIT License, please see the LICENSE file for more information.


A delightful extension to the delightful AFNetworking to provide accelerated and resumable downloads




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