/**

• 把格式化的JSON格式的字符串转换成字典
• @param jsonString JSON格式的字符串
• @return 返回字典
  */

• (NSDictionary *)dictionaryWithJsonString:(NSString *)jsonString {
  if (jsonString == nil) return nil;
  NSData *jsonData = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
  NSError err;
  NSDictionary dic = [NSJSONSerialization JSONObjectWithData:jsonData
  options:NSJSONReadingMutableContainers
  error:&err];
  if(err) {
  NSLog(@"json解析失败：%@",err);
  return nil;
  }
  return dic;
  }
  /

• 把字典转换成格式化的JSON格式的字符串
• @param dic 字典
• @return JSON格式的字符串
  */

• (NSString *)dictionaryToJson:(NSDictionary *)dic {
  NSError *parseError = nil;
  NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dic options:NSJSONWritingPrettyPrinted error:&parseError];
  return [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
  }