无法从 JSONDecoder 获取数据，没错，我编的结构？

Question

我有这样一个结构，我拿了一块来获取数据。这是我的 code.Why 我不能从 Api 获取数据吗？任何人都可以帮忙吗？在 answer.It 中写的例子似乎都是正确的。我将不胜感激。

[{
    "id": 142636,
    "apiId": 353056,
    "shortName": "K. McKenzie-Lyle",
    "firstName": "Kai",
    "middleName": null,
    "lastName": "McKenzie-Lyle",
    "imageFileName": null,
    "height": 195,
    "weight": 86,
    "birthDate": "1997-11-30T00:00:00",
    "contractExpiration": null,
    "onLoanSquadTillDate": null,
    "oldApiId": 344534,
    "age": 22,
    "birthAreaId": 80,
    "passportAreaId": 110,
    "footName": "Right",
    "male": true,
    "currentSquadId": 20401,
    "parentSquadId": 46,
    "nationalSquadId": 31885,

    }]

我的代码结构尝试了解码和 "id" 等

struct PlayerRoster:Codable {
    let id: String?
    let apiId:String?
    let shortName: String?
    let firstName: String?
    let middleName:String?
    let lastName:String?
    let imageFileName:String?
    let height:Double?
    let weight:Double?


}

我的负载urlapi地址。

func loadingApi(){
            let urlData = "https://apidev.transferroom.com/api/values"

            guard let url = URL(string: urlData) else { return }

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


                guard let data = data else { return }
                guard error == nil else {return}


                    do {
                        let decoder = JSONDecoder()

                        //using the array to put values
                      let player = try decoder.decode(PlayerRoster.self, from: data)
                      self.updatedPlauers = player




                    } catch let error as NSError {
                        print("Failed to load: \(error.localizedDescription)")
                    }
                }


            task.resume()

        }
    }

Answer 1

你需要

let player = try decoder.decode([PlayerRoster].self, from: data)

你的 json 的根是一个由 [] 指示的数组，这样做有助于了解问题

} catch {
   print("Failed to decode : \(error)")
 }

加上

let id: Int?
let apiId:Int?

无法从 JSONDecoder 获取数据，没错，我编的结构？

Unable to get data from JSONDecoder ,that's right, I made up the structure?

ios

swift

xcode

jsondecoder