無法解析 swift 中的 json 數據

Question

我有一個 API 響應，如下所示：

{
    "status": 200,
    "schedule_data": {
        "2020_08_16_1597485600": {
            "schedule_date": "2020-08-16",
            "nanny_id": 2,
            "shift_start": "06:00",
            "shift_end": "13:00",
            "schedule_id": 112
        },
        "2020_08_16": {
            "schedule_date": "2020-08-16",
            "nanny_id": 2,
            "shift_start": "",
            "shift_end": "",
            "schedule_id": 0
        },
        "2020_08_17_1597485600": {
            "schedule_date": "2020-08-17",
            "nanny_id": 2,
            "shift_start": "06:00",
            "shift_end": "22:00",
            "schedule_id": 113
        },
        "2020_08_17": {
            "schedule_date": "2020-08-17",
            "nanny_id": 2,
            "shift_start": "",
            "shift_end": "",
            "schedule_id": 0
        },
        "2020_08_18": {
            "schedule_date": "2020-08-18",
            "nanny_id": 2,
            "shift_start": "",
            "shift_end": "",
            "schedule_id": 0
        },
        "2020_08_19": {
            "schedule_date": "2020-08-19",
            "nanny_id": 2,
            "shift_start": "",
            "shift_end": "",
            "schedule_id": 0
        },
        "2020_08_20": {
            "schedule_date": "2020-08-20",
            "nanny_id": 2,
            "shift_start": "",
            "shift_end": "",
            "schedule_id": 0
        },
        "2020_08_21": {
            "schedule_date": "2020-08-21",
            "nanny_id": 2,
            "shift_start": "",
            "shift_end": "",
            "schedule_id": 0
        },
        "2020_08_22": {
            "schedule_date": "2020-08-22",
            "nanny_id": 2,
            "shift_start": "",
            "shift_end": "",
            "schedule_id": 0
        },
        "2020_08_23": {
            "schedule_date": "2020-08-23",
            "nanny_id": 2,
            "shift_start": "",
            "shift_end": "",
            "schedule_id": 0
        },
        "2020_08_24": {
            "schedule_date": "2020-08-24",
            "nanny_id": 2,
            "shift_start": "",
            "shift_end": "",
            "schedule_id": 0
        },
        "2020_08_25": {
            "schedule_date": "2020-08-25",
            "nanny_id": 2,
            "shift_start": "",
            "shift_end": "",
            "schedule_id": 0
        },
        "2020_08_26": {
            "schedule_date": "2020-08-26",
            "nanny_id": 2,
            "shift_start": "",
            "shift_end": "",
            "schedule_id": 0
        },
        "2020_08_27": {
            "schedule_date": "2020-08-27",
            "nanny_id": 2,
            "shift_start": "",
            "shift_end": "",
            "schedule_id": 0
        },
        "2020_08_28": {
            "schedule_date": "2020-08-28",
            "nanny_id": 2,
            "shift_start": "",
            "shift_end": "",
            "schedule_id": 0
        },
        "2020_08_29": {
            "schedule_date": "2020-08-29",
            "nanny_id": 2,
            "shift_start": "",
            "shift_end": "",
            "schedule_id": 0
        },
        "2020_08_30": {
            "schedule_date": "2020-08-30",
            "nanny_id": 2,
            "shift_start": "",
            "shift_end": "",
            "schedule_id": 0
        },
        "2020_08_31": {
            "schedule_date": "2020-08-31",
            "nanny_id": 2,
            "shift_start": "",
            "shift_end": "",
            "schedule_id": 0
        }
    }
}

我有這個 API 響應的數據 model ，如下所示：

import Foundation

struct Welcome: Codable {
    let status: Int
    let scheduleData: [String: ScheduleDatum]

    enum CodingKeys: String, CodingKey {
        case status
        case scheduleData = "schedule_data"
    }
}

// MARK: - ScheduleDatum
struct ScheduleDatum: Codable {
    let scheduleDate: String?
    let nannyID: Int?
    let shiftStart: String?
    let shiftEnd: String?
    let scheduleID: Int?

    enum CodingKeys: String, CodingKey {
        case scheduleDate = "schedule_date"
        case nannyID = "nanny_id"
        case shiftStart = "shift_start"
        case shiftEnd = "shift_end"
        case scheduleID = "schedule_id"
    }
}

我想要 schedule_id 不為零的數據的 schedule_date 值。此 schedule_data 是一個字典數組。json 解析在 ios Z818056DBD7E2012418CZ88 代碼中以這種方式完成。

let decoder = JSONDecoder()
      
      do {
          
          let user = try decoder.decode(ScheduleListModel.self, from: response.data!)
          self.listdata = user
       

       
        if (self.listdata?.scheduleData.count)! > 0
       {

       }
       else
       {
        self.showAlert(message: "No schedule available")
       }
       
         } catch {
             debugPrint(error)
      }

如何獲取該數組字典中的值？

Answer 1

這里有一些需要改進的地方。 首先，如果鍵永遠不會變為nil ，則 model 屬性不必是可選的。 其次，不需要編碼密鑰，因為可以通過convertFromSnakeCase來實現。

Model：

let data = Data(string.utf8)

struct Welcome: Codable {
    let status: Int
    let scheduleData: [String: ScheduleDatum]
}

struct ScheduleDatum: Codable {
    let scheduleDate: String
    let nannyId: Int
    let shiftStart: String
    let shiftEnd: String
    let scheduleId: Int
}

需要對 model Welcome進行解碼。 此外，遍歷數據以獲取scheduleDates 。 就是這樣：

do {
    let decoder = JSONDecoder()
    decoder.keyDecodingStrategy = .convertFromSnakeCase

    let user = try decoder.decode(Welcome.self, from: response.data)
    var scheduleDates = [String]()

    for schedule in user.scheduleData {
        if schedule.value.scheduleId != 0 {
            scheduleDates.append(schedule.value.scheduleDate)
        }
    }
    print(scheduleDates)
} catch {
    debugPrint(error)
}

Answer 2

您可以根據字典的值過濾字典並獲取日期。 您應該使用Welcome model 來解析 JSON 並進行過濾。

這是代碼：

let decoder = JSONDecoder.init()

let welcomeModel = try! decoder.decode(Welcome.self, from: response.data)

welcomeModel.scheduleData.enumerated().forEach {
    if $1.value.scheduleID != 0 || $1.value.scheduleID != nil {
        print($1.value.scheduleDate ?? "Date is nil")
    } 
}