Question

I’m trying to receive a certain value in a json using AFNetworking. The value only contains digits and I want to receive it as a NSString. When I compare the received value, I get a exception (exception is also mentioned later in this post)

here is the coding producing the error.

 NSArray *overallGameResultsArray = [resultDictionary valueForKey:@"overall_game_results"];
        winCountDictionary = [[NSDictionary alloc] init];
        for (NSDictionary *gameResultsDictionary in overallGameResultsArray)
        {
            NSString *userId = [gameResultsDictionary valueForKey:@"winner_user_id"];
            NSString *winCount = [gameResultsDictionary valueForKey:@"win_count"];

            if ([winCount isEqualToString:@"0"])
            {
                NSLog(@"0 wins");
            }

        } 

I don’t get the exception if the “if comparison” is commented. The win_count only consists of digits in the jSON response.

Following is the exception error I’m getting.

2012-10-10 15:41:35.086 FMB[3549:c07] -[__NSCFNumber isEqualToString:]: unrecognized selector sent to instance 0x7230af0 2012-10-10 15:41:35.086 FMB[3549:c07] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFNumber isEqualToString:]: unrecognized selector sent to instance 0x7230af0'
*** First throw call stack: (0x1638012 0x1345e7e 0x16c34bd 0x1627bbc 0x162794e 0x11e03 0x20583 0x1fab4 0x245053f 0x2462014 0x24527d5 0x15deaf5 0x15ddf44 0x15dde1b 0x26997e3 0x2699668 0x28d65c 0x2512 0x2445) libc++abi.dylib: terminate called throwing an exception

Answer 1

i think you’ll have to do :

NSString *winCount=[NSString stringWithFormat:@"%d",[[gameResultsDictionary valueForKey:@"win_count"]intValue];

With this, you get the number value into the winCount NSString, and then you can use isEqualToString method