json格式字符串转字典，字典转json格式字符串

/*!

* @brief 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:jsonDataoptions:NSJSONReadingMutableContainerserror:&err];//反序列化

if(err) {

NSLog(@"json解析失败：%@",err);

return nil;

}

return dic;

}

+(NSString*)dictionaryToJson:(NSDictionary *)dic

{

NSError *parseError = nil;

NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dic

options:NSJSONWritingPrettyPrinted error:&parseError];//序列化

return [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];

}