NSDictionary    dictionaryWithObjectsAndKeys

   NSDictionary *parmDic = [NSDictionary dictionaryWithObjectsAndKeys:self.objClass.appId,@"appId",
                                self.objClass.cityCd,@"cityCd",
                                self.objClass.channelID,@"channelId",
                                1,@"currentPage",
                                1,@"pageSize",nil];

    NSDictionary *parmDic = [NSDictionary dictionaryWithObjectsAndKeys:@"SZ100",@"appId",
                                    @"苏州",@"cityCd",@"123",@"modelCd",
                                    1,@"channelId",
                                    1,@"currentPage",
                                    1,@"pageSize",nil];
    

网络传参，走到这一步就挂了，报

EXC_BAD_ACCESS ，90%的错误来源在于对一个已经释放的对象进行release操作。

于是改成下面那样也不行，继续查，才知道是

dictionaryWithObjectsAndKeys方法在遇到nil对象时，会以为是最终的结束标志。

见，

http://www.cocoachina.com/bbs/read.php?tid-124307.html

最后就改成这样，才通过：

    NSMutableDictionary* parmDic = [NSMutableDictionary dictionary];
    [parmDic setValue:self.objClass.appId forKey:@"appId"];
    [parmDic setValue:self.objClass.cityCd forKey:@"cityCd"];
    [parmDic setValue:self.objClass.modelCd forKey:@"modelCd"];
    [parmDic setValue:self.objClass.channelID forKey:@"channelID"];
    [parmDic setValue:@(self.page) forKey:@"currentPage"];
    [parmDic setValue:@(self.pageSize)  forKey:@"pageSize"];