Im working on the following function:

-(void)logResults:(NSDictionary *)results { 
    NSMutableString *logString = [[NSMutableString alloc]init]; 
    for (NSString *key in results) { 
        if([key isEqualToString:@"index"]){ 
            NSString *string = [[NSString alloc]initWithString:[results objectForKey:key]]; 
            string = [string stringByReplacingOccurrencesOfString:@"\n" withString:@""]; 
            [results setValue:string forKey:key]; 
        } 
        NSLog(@"KEY: %@, VALUE: %@", key, [results objectForKey:key]); 
        [logString appendFormat:@"|%@ = %@ \n", key, [results objectForKey:key]]; 
    } 
    self.logInfo.text = [logString stringByAppendingString:self.logInfo.text]; 
}

problem lies within the if, I get the following error: [_NSArrayM length] unrecognised sel...

I was first attempting to use following expression for the if's work:

//[results setValue:[((NSString *)[results objectForKey:key])
stringByReplacingOccurrencesOfString:@"\n" withString:@""] forKey:@"index"];

which resulted in:

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSArrayM stringByReplacingOccurrencesOfString:withString:]