如何从Optional获取值(Optional(<__NSSingleObjectArrayI>(25)

Question

我想知道“价格”键的值是"25“。

我从后端得到了Json的回复

{
  "errorCode": 0,
  "message": "Request successfully served.",
  "data": {
    "games": {
      "TWELVEBYTWENTYFOUR": {
        "jackpot_amount": "KES 40,000.00",
        "draw_date": "2021-05-21 10:59:45",
        "extra": {
          "jackpotAmount": 40000,
          "unitCostJson": [
            {
              "currency": "KES",
              "price": 25
            }
          ]
        },
      }
    },
    "currentTime": {
      "date": "2021-05-20 22:28:18.738038"
    }
  }
}

这是我到目前为止的代码：

fetchData { (dict, error) in

    let playerLoginInfo = dataDict["data"] as? NSDictionary
    let playerGameInfo = playerLoginInfo?.value(forKey: "games") as? NSDictionary
    
    if let TWELVEBYTWENTYFOUR = playerGameInfo?.value(forKey: "TWELVEBYTWENTYFOUR") as? NSDictionary {

            let extra = TWELVEBYTWENTYFOUR.value(forKey: "extra") as? NSDictionary
            let unitCostJson = extra?.value(forKey: "unitCostJson") as? NSArray
            print("price")
            print(unitCostJson?.value(forKey: "price") as? Any)

    }
}

我知道这是控制台：

Optional(Optional(<__NSSingleObjectArrayI 0x600001f091d0>(
25
)
))

我已经看过这个问题了，但我想不出一个解决方案

编辑：

我现在已经使用Codeable来获取数据：

struct Resp: Codable {
    let errorCode: Int
    let message: String
    let data: Dat
}
struct Dat: Codable {
    let games: Games
    let currentTime: CurrentTime
}

struct Games: Codable {
    let game_code: String
    let datetime: String
    let estimated_jackpot: String
    let guaranteed_jackpot: String
    let jackpot_title: String
    let jackpot_amount: String
    let draw_date: String
    let extra: Extra
    let next_draw_date: String
    let active: String
}
struct Extra: Codable {
    let currentDrawNumber: Int
    let currentDrawFreezeDate: String
    let currentDrawStopTime: String
    let jackpotAmount: Int
    let unitCostJson: [UnitCostJson]
}
struct UnitCostJson: Codable {
    let currency: String
    let price: Int
}

struct CurrentTime: Codable {
    let date: String
    let timezone_type: Int
    let timezone: String
}

我现在正在尝试使用下面的代码从价格中获取值

    do{
        let resp:Resp = try JSONDecoder().decode(Resp.self , from:data);
        let data = resp.data
        let games = data.games
        let extra = games.extra
        let unitCostJson = extra.unitCostJson
        print(unitCostJson[0].price) 
    }
    catch{
        GlobalFunctions.shared.callOnMainThread {
            self.showAlert(Message: "Something went wrong. Please retry.")
        }
    }

它正在进入catch，现在我应该如何在unitCostJson上获取内部数据？

Answer 1

我删除了你的结构并删除了所有不相关的属性(与json相比)，如果你想重新添加它们，你需要使用一个CodingKey枚举

struct Resp: Codable {
    let errorCode: Int
    let message: String
    let data: Dat
}
struct Dat: Codable {
    let games: [String:Games]
    let currentTime: CurrentTime
}

struct Games: Codable {
    let extra: Extra
}
struct Extra: Codable {

    let unitCostJson: [UnitCostJson]
}
struct UnitCostJson: Codable {
    let currency: String
    let price: Int
}

struct CurrentTime: Codable {
    let date: String
}

现在您可以像这样访问unitCost

let unitCost = resp.data.games["TWELVEBYTWENTYFOUR"]?.extra.unitCostJson