json字符串转成字典

/*
* @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:jsonData

options:NSJSONReadingMutableContainers

error:&err];
if(err) {
NSLog(@"json解析失败：%@",err);
return
nil;
}
return dic;
}