json - 如何使用 Alamofire 和 Swift 4.0 从 JSON 获取值？

Question

    {
  "uri" : "http://www.edamam.com/ontologies/edamam.owl#recipe_f9e656dd9d2b4db9816340687d01722c",
  "calories" : 38,
  "totalWeight" : 113.25,
  "dietLabels" : [ "LOW_FAT" ],
  "healthLabels" : [ "SUGAR_CONSCIOUS", "VEGAN", "VEGETARIAN", "PEANUT_FREE", "TREE_NUT_FREE", "ALCOHOL_FREE" ],
  "cautions" : [ ],
  "totalNutrients" : {
    "ENERC_KCAL" : {
      "label" : "Energy",
      "quantity" : 38.505,
      "unit" : "kcal"
    },
    "FAT" : {
      "label" : "Fat",
      "quantity" : 0.41902500000000004,
      "unit" : "g"
    },
    "FASAT" : {
      "label" : "Saturated",
      "quantity" : 0.044167500000000005,
      "unit" : "g"
    },
    "FAMS" : {
      "label" : "Monounsaturated",
      "quantity" : 0.0124575,
      "unit" : "g"
    },
    "FAPU" : {
      "label" : "Polyunsaturated",
      "quantity" : 0.043035000000000004,
      "unit" : "g"
    }
  }

}

/** 联网方式*/

   func getNutritionData(url: String) {
        Alamofire.request(url, method: .get)
            .responseString { response in
                if response.result.isSuccess {

                    print("Sucess! Got the Nutrition data")
                    let nutritionJSON : JSON = JSON(response.result.value!)
                    //print(nutritionJSON)
                    self.updateNutritionData(json: nutritionJSON)

                } else {
                    print("Error: \(String(describing: response.result.error))")
                    self.caloriesLable.text = "Connection Issues"
                }
        }
    }



func updateNutritionData(json: JSON) {
    let calories = json["calories"].intValue
    print(calories)
}

^ 例如，当我尝试获取卡路里时，我得到了零

在 NutritionData 方法中，我尝试使用 .responseJSON 但它抛出错误，因此我切换到 .responseString。我想从该 JSON 中获取“totalNutrients”信息。如有帮助，我们将不胜感激

Answer 1

最好使用带有 responseJSON 的方法，而不是 responseString

Alamofire.request(url, method: .get, parameters:nil, encoding: JSONEncoding.default).responseJSON { response in
            print(response)

      if let json = response.result.value as? [String:Any] {
         print(json["calories"])
      }


  }

然后尝试