nsdictionary to jsonString

by lesvio

+ (NSData *)toJSONData:(id)theData{        NSError *error = nil;    NSData *jsonData = [NSJSONSerialization dataWithJSONObject:theData                                                       options:NSJSONWritingPrettyPrinted                                                         error:&error];    if ([jsonData length] > 0 && error == nil){        return jsonData;    }else{        return nil;    }}+ (NSString *)dictionaryToJsonString:(NSDictionary *)dict {    NSString *jsonString = [[NSString alloc] initWithData:[self toJSONData:dict]                                                 encoding:NSUTF8StringEncoding];    return jsonString;}