An AFNetworking RubyMotion iOS Example

An example to demonstrate the use of AFNetworking with RubyMotion.

Quickstart

    git clone https://github.com/ericdagenais/AFNetworking-RubyMotion-Example.git
    cd AFNetworking-RubyMotion-Example

Install both the 'cocoapods' and 'motion-cocoapods' gems via bundler (see this article for more info). Gemfile installs specific versions to workaround an incompatibility with the latest Cocoapods gem.

    # gem install bundler  # install bundler if you don't have it already
    bundle install

Run the example

    rake

Caveats

nil Callback Blocks

The Objective-C examples for AFNetworking often pass in nil as callback blocks. In RubyMotion, passing in nil to these callbacks causes a crash if the callback ever needs to be called. To avoid crashing, pass in an empty proc with the correct number of parameters.

For example, passing in nil to failure: below works in Objective-C but will cause a crash in RubyMotion if the request fails:

NSURL *url = [NSURL URLWithString:@"http://api.twitter.com/1/statuses/public_timeline.json"];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {
    NSLog(@"Public Timeline: %@", JSON);
} failure:nil];
[operation start];

Therefore, the above should be written as the following to avoid problems:

url = NSURL.URLWithString("http://api.twitter.com/1/statuses/public_timeline.json")
request = NSURLRequest.requestWithURL(url)
operation = AFJSONRequestOperation.JSONRequestOperationWithRequest(request, success:lambda {
  |request, response, json|
  NSLog("Public Timeline: %@", json)
}, failure:lambda {
  |request, response, error, json| # correct number of parameters is important
})
operation.start

Groups discussion

Dependencies

• XCode 4.x w/ iOS SDK 5.x
• RubyMotion
• CocoaPods

Interested in RestKit instead of AFNetworking? Checkout RestKitTest.