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我正在尝试使用 Structs 解码 nfl 播放器的 json 文件，但在检查第一个播放器的 PlayerID 后它一直失败，该播放器从不为空。我不确定我做错了什么，但我真的很感谢你的指导，我想我已经盯着这个看了整整 24 小时。

这是 JSON 文件的示例： 在此处输入图像描述

这是我的结构：

// MARK: PLAYERS.JSON STRUCTS
struct playersArrayJSON: Codable {
    let lastUpdatedOn: String
    let players: Array<nflPlayers>
    
    enum CodingKeys: String, CodingKey {
        case lastUpdatedOn = "lastUpdatedOn"
        case players = "players"
    }
}

struct nflPlayers: Codable {
    let playerID: Int
    let first: String
    let last: String
    let POS: String?
    let team: nflTeam?
    let imageSrc: String?
    let currentInjury: injury?
    
    enum CodingKeys: String, CodingKey {
        case playerID = "id"
        case first = "firstName"
        case last = "lastName"
        case POS = "primaryPosition"
        case team = "currentTeam"
        case imageSrc = "officialImageSrc"
        case currentInjury = "currentInjury"
    }
}

struct nflTeam: Codable {
    let teamID: Int
    let abbv: String
    
    enum CodingKeys: String, CodingKey {
        case teamID = "id"
        case abbv = "abbreviation"
    }
}

struct injury: Codable {
    let description: String
    let designation: String
    
    enum CodingKeys: String, CodingKey {
        case description = "description"
        case designation = "playingProbability"
    }
}

这是我调用来解码 Json 的函数：

func decodePlayersJSON() {
        // Get the players.json from docdir
        if let documentDirectory = FileManager.default.urls(for: .documentDirectory,
            in: .userDomainMask).first {
            let pathWithFileName = documentDirectory.appendingPathComponent("players.json")
            let fileUrl = URL(fileURLWithPath: pathWithFileName.path)
            do { // See if the players.json exist in docdir
                let data = try Data(contentsOf: fileUrl, options: .mappedIfSafe)
                // Exists in DocDir - Try decoding JSON and writing to jsonLocalArray
                if let searchResult: playersArrayJSON = try! JSONDecoder().decode(playersArrayJSON.self, from:data) {
                    jsonLocalArray = searchResult
                    print("Players.Json decoded successfully")
                    DispatchQueue.main.async {
                        self.lblDetails.text = "player's database updated successfully"
                        self.performSegue(withIdentifier: "toQuiz", sender: nil)
                    }
                    print(jsonLocalArray)
                } else {
                    print("Error decoding players.json.")
                }
            } catch {
                print("No data found when decoding players.json")
            }
        }
    }

这是我在控制台中遇到的错误：

致命错误：“试试！” 表达式意外引发错误：Swift.DecodingError.keyNotFound(CodingKeys(stringValue: "id", intValue: nil), Swift.DecodingError.Context(codingPath: [CodingKeys(stringValue: "players", intValue: nil), _JSONKey(stringValue : "Index 0", intValue: 0)], debugDescription: "No value associated with key CodingKeys(stringValue: "id", intValue: nil) ("id").", underlyingError: nil)): 文件 CoachesChallenge/UpdatingVC .swift，第 293 行 2020-10-09 18:08:08.412910-0700 CoachesChallenge[32143:2136162] 致命错误：“尝试！” 表达式意外引发错误：Swift.DecodingError.keyNotFound(CodingKeys(stringValue: "id", intValue: nil), Swift.DecodingError.Context(codingPath: [CodingKeys(stringValue: "players", intValue: nil),

***非常感谢任何帮助和反馈！！！！先感谢您！！！

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