Как вы разбираете этот JSON?

Используйте эту ссылку для создания модели

Используйте классический словарь Swift Key/Value

Вы получаете такую ​​модель: ---

/* 
Copyright (c) 2022 Swift Models Generated from JSON powered by http://www.json4swift.com

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

import Foundation
 
/* For support, please feel free to contact me at https://www.linkedin.com/in/syedabsar */

public class Recent {
    public var gameID : String?
    public var consoleID : String?
    public var consoleName : String?
    public var title : String?
    public var imageIcon : String?
    public var lastPlayed : String?
    public var numPossibleAchievements : String?
    public var possibleScore : String?
    public var numAchieved : String?
    public var scoreAchieved : String?
    public var numAchievedHardcore : Int?
    public var scoreAchievedHardcore : Int?

/**
    Returns an array of models based on given dictionary.
    
    Sample usage:
    let recent_list = Recent.modelsFromDictionaryArray(someDictionaryArrayFromJSON)

    - parameter array:  NSArray from JSON dictionary.

    - returns: Array of Recent Instances.
*/
    public class func modelsFromDictionaryArray(array:NSArray) -> [Recent]
    {
        var models:[Recent] = []
        for item in array
        {
            models.append(Recent(dictionary: item as! NSDictionary)!)
        }
        return models
    }

/**
    Constructs the object based on the given dictionary.
    
    Sample usage:
    let recent = Recent(someDictionaryFromJSON)

    - parameter dictionary:  NSDictionary from JSON.

    - returns: Recent Instance.
*/
    required public init?(dictionary: NSDictionary) {

        gameID = dictionary["GameID"] as? String
        consoleID = dictionary["ConsoleID"] as? String
        consoleName = dictionary["ConsoleName"] as? String
        title = dictionary["Title"] as? String
        imageIcon = dictionary["ImageIcon"] as? String
        lastPlayed = dictionary["LastPlayed"] as? String
        numPossibleAchievements = dictionary["NumPossibleAchievements"] as? String
        possibleScore = dictionary["PossibleScore"] as? String
        numAchieved = dictionary["NumAchieved"] as? String
        scoreAchieved = dictionary["ScoreAchieved"] as? String
        numAchievedHardcore = dictionary["NumAchievedHardcore"] as? Int
        scoreAchievedHardcore = dictionary["ScoreAchievedHardcore"] as? Int
    }

        
/**
    Returns the dictionary representation for the current instance.
    
    - returns: NSDictionary.
*/
    public func dictionaryRepresentation() -> NSDictionary {

        let dictionary = NSMutableDictionary()

        dictionary.setValue(self.gameID, forKey: "GameID")
        dictionary.setValue(self.consoleID, forKey: "ConsoleID")
        dictionary.setValue(self.consoleName, forKey: "ConsoleName")
        dictionary.setValue(self.title, forKey: "Title")
        dictionary.setValue(self.imageIcon, forKey: "ImageIcon")
        dictionary.setValue(self.lastPlayed, forKey: "LastPlayed")
        dictionary.setValue(self.numPossibleAchievements, forKey: "NumPossibleAchievements")
        dictionary.setValue(self.possibleScore, forKey: "PossibleScore")
        dictionary.setValue(self.numAchieved, forKey: "NumAchieved")
        dictionary.setValue(self.scoreAchieved, forKey: "ScoreAchieved")
        dictionary.setValue(self.numAchievedHardcore, forKey: "NumAchievedHardcore")
        dictionary.setValue(self.scoreAchievedHardcore, forKey: "ScoreAchievedHardcore")

        return dictionary
    }

}

Используйте эту модель для извлечения данных json из ответа API, как это: ----

let dataList = [Recent]()


    func getRecentGames(User: String,KEY: String,OtherUser: String){
        let RECENT_URL = "https://ra.hfc-essentials.com/user_recent.php?user=+\(User)+&key=+\(KEY)+&member=\(OtherUser)&results=10&mode=json"
        print(RECENT_URL)
        
        //URLSession.data
        
        let task = URLSession.shared.dataTask(with: URLRequest(url: URL(string: RECENT_URL)!)) { data, response, error in

            if let error = error{
                print(error)
            }
            
            do {
                if let json = try JSONSerialization.jsonObject(with: data!, options: []) as? NSDictionary {
                    print("Response: \(json)")
                    
                    if let data = json.value(forKey: "recent") as? [NSArray] {
                        self.dataList = Recent.modelsFromDictionaryArray(array: data[0])
                    }
                    
                    
                    print(self.dataList.first?.numAchieved)
                    
                    // self.mainResponse(json)
                } else {
                    let jsonStr = NSString(data: data!, encoding: String.Encoding.utf8.rawValue)// No error thrown, but not NSDictionary
                    print("Error could not parse JSON: \(jsonStr)")
                    // self.eroorResponse(jsonStr!)
                }
            } catch let parseError {
                print(parseError)// Log the error thrown by `JSONObjectWithData`
                let jsonStr = NSString(data: data!, encoding: String.Encoding.utf8.rawValue)
                print("Error could not parse JSON: '\(jsonStr)'")
                // self.eroorResponse(jsonStr!)
            }
            
        }
        task.resume()
    }

Мне удалось решить эту проблему, добавив в перечисление следующее свойство, которое можно использовать для простого доступа к значению int.

  var intValue: Int? {
        switch self {
        case .integer(let value): return value
        case .string(let value): return Int(value)
  }