Codable Swift JSON 解析嵌套 JSON

Question

我有看起來像這樣的 JSON 數據

{
    "latitude": 34.088051,
    "longitude": -118.296512,
    "timezone": "America/Los_Angeles",
    "daily": {
        "summary": "No precipitation throughout the week, with high temperatures rising to 92°F on Friday.",
        "icon": "clear-day",
        "data": [
            {
                "time": 1535266800,
                "summary": "Mostly cloudy in the morning.",
                "icon": "partly-cloudy-day",
                "sunriseTime": 1535289854,
                "sunsetTime": 1535336915,
                "moonPhase": 0.51}

我想從中提取時間，摘要，圖標。

我創建了一個 WeatherObject 類型的類，但這就是我卡住的地方。 如何創建結構？ 鍵不是蛇形外殼或命名不當，所以我想我可以不使用枚舉來重命名變量名稱。

編輯：做 - 抓住跌倒。 VC 實現協議。 傳遞給協議方法的數據在方法實現中打印，但無法在 do 子句中處理。

protocol NetworkingDelegate: AnyObject {
    func didGetResult(data: Data?) -> Void
}


class Networking: NSObject {

    var data: Data?
    weak var delegate: NetworkingDelegate?

    func makeAPIRequest(apiString: String) -> Void {
        guard let url: URL = URL(string: apiString) else{
            print("ERROR no URL")
            return
        }

        let urlRequest = URLRequest(url: url)

        let dataSession = URLSession.shared
        let dataTask = dataSession.dataTask(with: urlRequest) { (data, response, error) in

            guard error == nil else{
                print("ERROR found in networking call")
                print(error!)
                return
            }

            if data != nil{

                print("Data exists in networking")
                self.delegate?.didGetResult(data: data!)




            }else{
                print("ERROR: did not receive data")
            }
        }

        dataTask.resume()
    }


}

在視圖控制器中

  func didGetResult(data: Data?) {



            do {

                if let dataObject = data{

                    let theString:NSString = NSString(data: dataObject, encoding: String.Encoding.ascii.rawValue)!
                    print(theString)
                }
                let newJSONDecoder = JSONDecoder()
                let weatherObject = try newJSONDecoder.decode(WeatherObj.self, from:data!)
                let dailyObject = weatherObject.daily
                let dataArray = dailyObject.data
                //LOOP THROUGH dataArray and get the required info
                for val in dataArray {
                    print("=======")
                    print(val.time)
                    print(val.summary)
                    print(val.icon)
                    print("=======")
                }
            } catch {
                print("error while parsing:\(error.localizedDescription)")
            }


        }

Answer 1

您可以像這樣創建結構

struct WeatherObject: Codable {
  let latitude: Double
  let longitude: Double
  let timezone: String
  let daily: Daily
}

struct Daily: Codable {
    let summary: String 
    let icon: String
    let data: [Datum]
}

struct Datum: Codable {
    let time: Int
    let summary: String
    let icon: String
    let sunriseTime: Int
    let sunsetTime: Int
    let moonPhase: Double
}

然后你可以解析它並獲得所需的信息

do {
    let newJSONDecoder = JSONDecoder()
    let weatherObject = try newJSONDecoder.decode(WeatherObject.self, from: jsonData)
    let dailyObject = weatherObject.daily
    let dataArray = dailyObject.data
    //LOOP THROUGH dataArray and get the required info
    for val in dataArray {
        print("=======")
        print(val.time)
        print(val.summary)
        print(val.icon)
        print("=======")
    }
} catch {
    print("error while parsing:\(error.localizedDescription)")
}

希望能幫助到你