Compare two NSDictionary

NSDictionary.h

-(BOOL)isEtalonDictionary:(NSDictionary *)etalonDictionary sameAs:(NSDictionary *)dictionary{
    BOOL res = NO;
    for (id item in etalonDictionary){
        NSObject *secondObject = [dictionary objectForKey:item];
        if (secondObject == nil)
            return NO;
        else{
            NSObject *value = [etalonDictionary objectForKey:item];
            if ([value isKindOfClass:[NSString class]]){
                NSString *string = (NSString *) value;
 
                if ([string isEqualToString:(NSString *) secondObject]){
                    res = YES;
                } else {
                    return NO;
                }
            }
 
            if ([value isKindOfClass:[NSNumber class]]){
                NSNumber *number = (NSNumber *) value;
                if([number isEqualToNumber:(NSNumber *) secondObject])
                    res = YES;
                else
                    return NO;
 
            }
 
            if ([value isKindOfClass:[NSDictionary class]]){
                res = [self isEtalonDictionary:(NSDictionary *) value sameAs:(NSDictionary *) secondObject];
                if (!res){
                    return NO;
                }
            }
        }
    }
 
    return res;
}