Block callback support added to the top-of-trunk library

[Greg Robbins]

The top-of-trunk library now includes support for block-style callbacks (completion handlers) as an alternative to separate callback methods.

Blocks are currently supported by Apple just on Mac OS X 10.6; iPhone and Mac OS X 10.4 & 10.5 applications must continue to use method-style callbacks.


Fetching a feed or entry with a block callback looks like this:

[service fetchFeedWithURL:feedURL
        completionHandler:^(GDataServiceTicket *ticket, GDataFeedBase *feed, NSError *error) {
            
    if (error == nil) {
        GDataFeedPhoto *photoFeed = (GDataFeedPhoto *)feed;
        // use photoFeed
    } else {
        // handle error
    }
}];

Just as with method-style callbacks, the completion handler block is executed later, on the same thread and run loop as the fetch, once the fetch has completed.

Block callbacks are also supported by GDataHTTPFetcher.

[Jeff Nichols]

Man I wish I could use that already. Never understood how nice
closures are for async APIs till I started using Javascript heavily.

Anyways, cheers for the update that I should be able to use in 2 or 3
years! ;-)

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