使用mj解析多层级json数据笔记

一、数据获取

1.这里是从服务端接口获取的GMTAfterSaleModel的数据源

[
            {
        "status": "403",
        "id": 55,
        "moId": "20210317194857255725536",
        "orderEntityList": [
          {
            "goodsCount": 1,
            "id": "20210317194857255725536",
            "shippingNo": "123",
            "privCouponPrice": 3.9900000000000002,
            "shippingName": "新鹏快递",
            "province": "上海市",
            "goodsId": "98631affe4da53145fb41e40997e9f22",
            "goodsOnSale": true,
            "shippingId": "001e5b2ee3887630aa601807979fb02c",
            "orderGoodsEntityList": [
              {
                "number": 1,
                "orderId": "20210317194857255725536",
                "goodsName": "南国食品壹分",
                "id": "3c592c55675d530caba7a8a7bc92d5ae",
                "goodsId": "98631affe4da53145fb41e40997e9f22",
                "retailPrice": 4,
                "skuText": "规格:默认 ",
                "skuId": "0570c97793da97bbdcd70e4e7f5870ca",
                "listPicUrl": "http://qiniu.hnjzt.ltd/20210202/a10715de398e4a33b9329e7c982eab82.png",
                "goodsSn": "123"
              }
            ],
            "shippingStatus": 3,
            "payStatus": 3,
            "payType": 0,
            "orderStatus": 301,
            "actualPrice": 0.01,
            "refundTime": "2021-03-17 20:03:06",           
            "orderPrice": 4,
            "goodsName": "南国食品壹分",
          }, ]

2.这里是从服务端接口获取到的GMTOurOrderModel的数据源

[{
        "goodsCount": 1,
        "id": "20210323110220436781900",
        "goodsId": "98631affe4da53145fb41e40997e9f22",
        "goodsOnSale": true,
        "orderTypeText": "商城订单",
        "orderGoodsEntityList": [
          {
            "id": "f0cf192112d2fae3a8dafbf7a815b705",
            "couponId": null,
            "payZhi": 0,
            "shippingFee": 0,
            "postscript": null,
            "privCouponPrice": 0,
            "goodsSn": "123",
            "retailPrice": 4,
            "skuId": "0570c97793da97bbdcd70e4e7f5870ca",
            "orderId": "20210323110220436781900",
            "goodsName": "南国食品壹分",
            "number": 1,
            "skuText": "规格:默认 ",
            "listPicUrl": "http://qiniu.hnjzt.ltd/20210202/a10715de398e4a33b9329e7c982eab82.png",
            "goodsId": "98631affe4da53145fb41e40997e9f22",
          }
        ],
        "shippingStatus": 1,
        "payStatus": 2,
        "orderStatus": 0,
        "actualPrice": 0.01,
        "refundTime": null,
        "orderPrice": 4,
      },]

二、数据对比
数据上来讲，字段基本上没有变化，层级有所不同，取值上来讲也是同一种列表需要，因此最基本的实现功能的办法是写三个model,Demo中的 GMTOurOrderModel 、GMTAfterSaleModel 和OrderGoodsEntityList。
具体实现方法这里是常规操作，这里不赘述，下面直接说下优化方案。

将GMTAfterSaleModel数据源中的orderEntityList中的数据提出到外层，（这里是数组，服务端只会返回一个值，没必要放里层，可以提出到外层），期望将GMTAfterSaleModel的数据源变成如下的方案来进行解析。

[
            {
        "status": "403",
        "id": 55,
        "moId": "20210317194857255725536",
        "goodsCount": 1,
            "id": "20210317194857255725536",
            "shippingNo": "123",
            "privCouponPrice": 3.9900000000000002,
            "shippingName": "新鹏快递",
            "province": "上海市",
            "goodsId": "98631affe4da53145fb41e40997e9f22",
            "goodsOnSale": true,
            "shippingId": "001e5b2ee3887630aa601807979fb02c",
            "orderGoodsEntityList": [
              {
                "number": 1,
                "orderId": "20210317194857255725536",
                "goodsName": "南国食品壹分",
                "id": "3c592c55675d530caba7a8a7bc92d5ae",
                "goodsId": "98631affe4da53145fb41e40997e9f22",
                "retailPrice": 4,
                "skuText": "规格:默认 ",
                "skuId": "0570c97793da97bbdcd70e4e7f5870ca",
                "listPicUrl": "http://qiniu.hnjzt.ltd/20210202/a10715de398e4a33b9329e7c982eab82.png",
                "goodsSn": "123"
              }
            "shippingStatus": 3,
            "payStatus": 3,
            "payType": 0,
            "orderStatus": 301,
            "actualPrice": 0.01,
            "refundTime": "2021-03-17 20:03:06",           
            "orderPrice": 4,
            "goodsName": "南国食品壹分",
          }, ]

这样来看既方便解析，又方便取值。
步骤1：需要写的内容是，需要将给GMTAfterSaleModel.h文件中添加goodsCount、shippingNo等属性。
步骤2：在GMTAfterSaleModel.m文件中需要实现的方法是

+(instancetype)mj_objectWithKeyValues:(id)keyValues context:(NSManagedObjectContext *)context {
    NSDictionary * dic = [[NSArray arrayWithArray:keyValues[@"orderEntityList"]] firstObject];
    GMTAfterSaleModel * model = [[[GMTAfterSaleModel alloc] mj_setKeyValues:dic] mj_setKeyValues:keyValues];
    return model;
}

步骤3.里层包含一个orderGoodsEntityList的处理方法

+(NSDictionary *)mj_objectClassInArray {
    return @{@"orderGoodsEntityList":[OrderGoodsEntityList class]};
}

这样就可以将GMTAfterSaleModel完整赋值。

三、设置父类

接下来可以进一步优化，将GMTAfterSaleModel设置为GMTOurOrderModel的子类进行优化，方便取值。还可以删掉GMTAfterSaleModel。

直接上代码

+(NSDictionary *)mj_objectClassInArray {
    return @{@"orderGoodsEntityList":[OrderGoodsEntityList class]};
}

+(instancetype)mj_objectWithKeyValues:(id)keyValues context:(NSManagedObjectContext *)context {
    if ([keyValues objectForKey:@"orderEntityList"]) {
        NSDictionary * dic = [[NSArray arrayWithArray:keyValues[@"orderEntityList"]] firstObject];
        GMTOurOrderModel * model = [[[GMTOurOrderModel alloc] mj_setKeyValues:dic] mj_setKeyValues:keyValues];
        return model;
    }else {
        return  [super mj_objectWithKeyValues:keyValues context:context];
    }
}

else语句处理父类的解析，if语句处理子类的解析，没冲突。

四、整理业务需求

将显示cell所需要的业务数据提前封装，在cell的setModel方法里直接取值

/*
 业务数据
 */

@property(nonatomic,assign)CGRect contentRect;

@property(nonatomic,strong)NSArray * btnsArr;

@property(nonatomic,strong)NSString * title;

实现见demo

demo：
https://gitee.com/xgkp/deal.git