Question

我正在尝试从Nutritionix API的自然语言处理器中查找食谱中每种成分的卡路里。我能够发送带有适当标头的POST请求并接收响应：但是我收到的JSON如下所示：

["foods": <__NSSingleObjectArrayI 0x6000037f8b50>(
{
"alt_measures" =     (
            {
        measure = cup;
        qty = 1;
        seq = 1;
        "serving_weight" = 240;
    },
            {
        measure = g;
        qty = 100;
        seq = "<null>";
        "serving_weight" = 100;
    },
            {
        measure = tsp;
        qty = 1;
        seq = 101;
        "serving_weight" = 5;
    },
            {
        measure = tbsp;
        qty = 1;
        seq = 102;
        "serving_weight" = 15;
    }
);
"brand_name" = "<null>";
"consumed_at" = "2019-04-28T18:54:47+00:00";
"food_name" = "beef stock";
   lat = "<null>";
lng = "<null>";
"meal_type" = 3;
metadata =     {
    "is_raw_food" = 0;
};
"ndb_no" = 6170;
"nf_calories" = "62.4";
"nf_cholesterol" = 0;
"nf_dietary_fiber" = 0;
"nf_p" = "148.8";
"nf_potassium" = 888;
"nf_protein" = "9.460000000000001";
"nf_saturated_fat" = "0.17";
"nf_sodium" = "950.4";
"nf_sugars" = "2.59";
"nf_total_carbohydrate" = "5.76";
"nf_total_fat" = "0.43";
"nix_brand_id" = "<null>";
"nix_brand_name" = "<null>";
"nix_item_id" = "<null>";
"nix_item_name" = "<null>";
photo =     {
    highres = "https://d2xdmhkmkbyw75.cloudfront.net/69_highres.jpg";
    "is_user_uploaded" = 0;
    thumb = "https://d2xdmhkmkbyw75.cloudfront.net/69_thumb.jpg";
};
"serving_qty" = 2;
"serving_unit" = cups;
"serving_weight_grams" = 480;
source = 1;
"sub_recipe" = "<null>";
tags =     {
    "food_group" = "<null>";
    item = "beef stock";
    measure = cups;
    quantity = "2.0";
    "tag_id" = 69;
};
upc = "<null>";
}
)
]

我需要“ nf_calories”的值。如何访问这些数据？这是代码：

func getCalories(ings: [Ingredient]) -> Void
{
    var queryString = ""
    for i in ings
    {
        if i.measurement != nil
        {
        queryString.append("\(i.amount.numerator)/\(i.amount.denominator) \(i.measurement!) \(i.name), ")
        }
        else
        {
        queryString.append("\(i.amount.numerator)/\(i.amount.denominator) \(i.name), ")
        }
    }

    let string = "https://trackapi.nutritionix.com/v2/natural/nutrients"
    let url = NSURL(string: string)
    let request = NSMutableURLRequest(url: url! as URL)
    request.setValue("application/json", forHTTPHeaderField: "Content-Type")
    request.addValue("***", forHTTPHeaderField: "x-app-id")
    request.addValue("***", forHTTPHeaderField: "x-app-key")
    request.addValue("0", forHTTPHeaderField: "x-remote-user-id")
    request.httpMethod = "POST"
    let json: [String:Any] = ["query":queryString, "timezone":"US/Central"]
    let jsonData = try? JSONSerialization.data(withJSONObject: json)
    request.httpBody = jsonData

    let task = URLSession.shared.dataTask(with: request as URLRequest) { data, response, error in
        guard let data = data, error == nil else {
            print(error?.localizedDescription ?? "No Data")
            return
        }
        let responseJSON = try? JSONSerialization.jsonObject(with: data, options: [])
        if let responseJSON = responseJSON as? [String:Any]
        {
            print("\(responseJSON)")
            if let d = responseJSON["foods"] as? [[String:Any]], !d.isEmpty, let cals = d[0]["nf_calories"] as? String
            {
                print(cals)
            }
        }
    }
    task.resume()

}

我对Swift并没有太多的经验，我该怎么做才能进入NSSingleObjectArrayI并提取数据？我在另一篇文章中找到了一种方法，但是当我在代码中实现它时，该方法不起作用。这是完成项目的最后一件事，我非常感谢您的帮助。

如何在JSON数据中访问NSSingleObjectArrayI中的信息？

0 个答案: