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Let’s revisit our fetchPhotoDetails: method. 1 2 +(RACReplaySubject *)fetchPhotoDetails:(FRPPhotoModel *)photoModel { RACReplaySubject *subject = [RACReplaySubject subject]; 3 4 5 6 7 8 9 10 11 12 NSURLRequest *request = [self photoURLRequest:photoModel]; [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler: ^(NSURLResponse *response, NSData *data, NSError *connectionError) { if (data) { id results = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil]\ [@"photo"]; 13 14 15 16 [self configurePhotoModel:photoModel withDictionary:results]; [self downloadFullsizedImageForPhotoModel:photoModel]; 17 18 [subject sendNext:photoModel]; ReactiveCocoa in Practice [subject sendCompleted]; } else { [subject sendError:connectionError]; } 19 20 21 22 23 }]; 24 25 return subject; 26 27 } A little messy.

Great. We can now run the app, tap on a photo, and see a full-size version of it. We can also swipe back and forth to see the next and previous photos. Good job! ReactiveCocoa in Practice 52 Revisiting FunctionalReactivePixels We hit a lot of the key parts of using ReactiveCocoa in the last section, but there are more opportunities to use ReactiveCocoa throughout the codebase. We’re going to explore those opportunities now. The first is in our gallery view controller. It’s implementing the methods of three different protocols: the collection view data source, the collection view delegate, the full-sized photo view controller delegate.

It assigns it to the return value of setKeyPath:onObject:. In practice, this method isn’t used a whole lot; we use the RAC C macro instead. We’ll cover that later, though. The subscription is necessary for two reasons. First, we want to dispose of it later, making it not accept new values. Second, the signal its subscribing to is cold, so no work will be done until someone subscribes to it. setKeyPath:onObject: is a method on RACSignal that binds the latest value of the signal to the key path of the object.

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