Question

I’ve implemented the AFNetworking framework, however I was trying to figure out a way of having the AFJSONRequestOperation function in a separate class and calling it from my individual view controllers.

What I’ve done is create a class method that takes the params in a dictionary and the webservice url. I would like this to be able to return the JSON array and the Http Code from the success block, however this is not working.

If I change the public function to have a return type and return a value at the end of the method, it returns before the success block has completed.

Any suggestions?

+ (void)RequestJSON:(NSDictionary *)params:(NSString *)webServicePath {

    NSURL *url = [NSURL URLWithString:@"http://api.website.com/"];

    AFHTTPClient *httpClient = [[AFHTTPClient alloc] initWithBaseURL:url];

    NSMutableURLRequest *request = [httpClient requestWithMethod:@"POST" path:webServicePath parameters:params];
    NSLog(@"%@", request);

    AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request

    success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON)
                                         {

                                           NSString *httpCode = [[JSON valueForKey:@"meta"]valueForKey:@"code"];
                                             NSLog(@"code=%@", httpCode);

                                         }

    failure:^(NSURLRequest *request , NSURLResponse *response , NSError *error , id JSON)
                                         {
                                             NSLog(@"Failed: %@",[error localizedDescription]);

                                         }];
    [operation start];

}

Answer 1

From recommendation by other users, I ended up creating my own Delegate that performs two selectors, didReceiveJSON and didNotReceiveJSON in the success and failure methods.

Edit: Here’s my code 🙂

JSONRequest.h

#import <Foundation/Foundation.h>

@class JSONRequest;

@protocol JSONRequest <NSObject>

- (void)didReceiveJSONResponse:(NSDictionary*)JSONResponse;
- (void)didNotReceiveJSONResponse;

@end

@interface JSONRequest : NSObject {

    id <JSONRequest> delegate;
}

@property (strong, nonatomic) id <JSONRequest> delegate;

- (void)RequestJSON:(NSDictionary* )params:(NSString*)webServicePath;

@end

JSONRequest.m

#import "JSONRequest.h"
#import "AFHTTPClient.h"
#import "AFJSONRequestOperation.h"

@implementation JSONRequest
@synthesize delegate;

- (void)RequestJSON:(NSDictionary *)params:(NSString *)webServicePath {

    NSURL *url = [NSURL URLWithString:@"http://api.mysite.com"];

    AFHTTPClient *httpClient = [[AFHTTPClient alloc] initWithBaseURL:url];

    NSMutableURLRequest *request = [httpClient requestWithMethod:@"POST" path:webServicePath parameters:params];
    NSLog(@"%@", request);

    AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request

    success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON)
                                         {
                                             NSDictionary *jsonDictionary = JSON;
                                             [delegate performSelector:@selector(didReceiveJSONResponse:) withObject:jsonDictionary];
                                         }

    failure:^(NSURLRequest *request , NSURLResponse *response , NSError *error , id JSON)
                                         {
                                             NSLog(@"Failed: %@",[error localizedDescription]);
                                             [delegate performSelector:@selector(didNotReceiveJSONResponse)];

                                         }];
    [operation start];

}

@end