Drupal iOS SDK with blocks instead of delegates - example DIOSView class, with implementation in DrupalMapApp

DIOSView.h

//
//  DIOSView.h
//  DrupalMapApp
//
//  Created by Jeffrey Linwood on 3/17/12.
//  Copyright (c) 2012 Jeff Linwood. All rights reserved.
//

#import <Foundation/Foundation.h>

#import "AFHTTPRequestOperation.h"

@interface DIOSView : NSObject

/**
 Returns the contents of the specified Drupal view. Implementation takes two blocks, one for success, and one for failure. Either parameter may be nil. 
 
 @param success The block to be executed on the completion of a successful request. This block has no return value and takes two arguments: the receiver operation and the object constructed from the response data of the request.
 @param failure The block to be executed on the completion of an unsuccessful request. This block has no return value and takes two arguments: the receiver operation and the error that occured during the request.
 
 */
- (void)getView:(NSString *)viewName success:(void (^)(AFHTTPRequestOperation *operation, id responseObject))success
        failure:(void (^)(AFHTTPRequestOperation *operation, NSError *error)) failure;
@end

DIOSView.m

//
//  DIOSView.m
//  DrupalMapApp
//
//  Created by Jeffrey Linwood on 3/17/12.
//  Copyright (c) 2012 Jeff Linwood. All rights reserved.
//

#import "DIOSView.h"

#import "DIOSSession.h"

@implementation DIOSView

/**
 Returns the contents of the specified Drupal view. Implementation takes two blocks, one for success, and one for failure. Either parameter may be nil. 
 
 @param success The block to be executed on the completion of a successful request. This block has no return value and takes two arguments: the receiver operation and the object constructed from the response data of the request.
 @param failure The block to be executed on the completion of an unsuccessful request. This block has no return value and takes two arguments: the receiver operation and the error that occured during the request.
 
 */
- (void)getView:(NSString *)viewName success:(void (^)(AFHTTPRequestOperation *operation, id responseObject))success
        failure:(void (^)(AFHTTPRequestOperation *operation, NSError *error)) failure {
    [[DIOSSession sharedSession] getPath:[NSString stringWithFormat:@"%@/%@/%@", kDiosEndpoint, kDiosBaseView, viewName] parameters:nil success:success failure:failure];
}

@end

MapViewController.m

- (void)viewDidAppear:(BOOL)animated{
    if ([[[AppData sharedInstance] businesses] count] != 0) {
        //we've already loaded data once for this app, so just display it on the map
        [self loadMapData];
    } else {
        [SVProgressHUD showWithStatus:@"Retrieving Data"];
        
        DIOSView *diosView = [[DIOSView alloc] init];
        [diosView getView:@"businesses.json" success:^(AFHTTPRequestOperation *operation, id responseObject) {
            //store results from the view into the application wide data
            [[AppData sharedInstance] storeResults:responseObject];
            [self loadMapData];
            [SVProgressHUD dismissWithSuccess:@"Downloaded"];
        } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
            [SVProgressHUD dismissWithError:@"Unable to download data" afterDelay:5];
        }];

    }
    
}