Question

我想将一个在线json文件加载到我的应用程序中，但我遇到了这个错误：

typeMismatch（Swift.Array， Swift.DecodingError.Context（codingPath：[]，debugDescription： “预计会对Array进行解码，但会找到一本字典。”， underlyingError：nil））

我已经查看了stackoverflow，但其他解决方案并没有帮助解决我的问题。

我的json

我的数据模型：

import Foundation

struct Initial: Codable {
    let copyright: String
    let totalItems: Int
    let totalEvents: Int
    let totalGames: Int
    let totalMatches: Int
    let wait: Int
    let dates: [Dates]
}

struct Dates: Codable {
    let date: String
    let totalItems: Int
    let totalEvents: Int
    let totalGames: Int
    let totalMatches: Int
    let games: [Game]
}

struct Game: Codable {
    let gamePk: Int
    let link: String
    let gameType: String
    let season: String
    let gameDate: String
    let status: Status
    let teams: Team
    let venue: Venue
    let content: Content
}

struct Status: Codable {
    let abstractGameState: String
    let codedGameState: Int
    let detailedState: String
    let statusCode: Int
    let startTimeTBD: Bool
}

struct Team: Codable {
    let away: Away
    let home: Home
}

struct Away: Codable {
    let leagueRecord: LeagueRecord
    let score: Int
    let team: TeamInfo
}

struct Home: Codable {
    let leagueRecord: LeagueRecord
    let score: Int
    let team: TeamInfo
}

struct LeagueRecord: Codable {
    let wins: Int
    let losses: Int
    let type: String
}

struct TeamInfo: Codable {
    let id: Int
    let name: String
    let link: String
}

struct Venue: Codable {
    let name: String
    let link: String
}

struct Content: Codable {
    let link: String
}

这是我的viewcontroller

import UIKit

class TodaysGamesTableViewController: UITableViewController {
    var todaysGamesURL: URL = URL(string: "https://statsapi.web.nhl.com/api/v1/schedule")!

    var gameData: [Dates] = []
    let activityIndicator = UIActivityIndicatorView(activityIndicatorStyle: .gray)

    override func viewDidLoad() {
        super.viewDidLoad()
        loadTodaysGames()
    }

    func loadTodaysGames(){
        print("load Games")

        view.addSubview(activityIndicator)
        activityIndicator.frame = view.bounds
        activityIndicator.startAnimating()

        let todaysGamesDatatask = URLSession.shared.dataTask(with: todaysGamesURL, completionHandler: dataLoaded)

        todaysGamesDatatask.resume()
    }

    func dataLoaded(data:Data?,response:URLResponse?,error:Error?){
        if let detailData = data{
            print("detaildata", detailData)
            let decoder = JSONDecoder()
            do {
                let jsondata = try decoder.decode([Dates].self, from: detailData)
                gameData = jsondata //Hier .instantie wil doen krijg ik ook een error

                DispatchQueue.main.async{
                    self.tableView.reloadData()
                }
            }catch let error{
                print(error)
            }
        }else{
            print(error!)
        }
    }

Answer 1

JSON由您的Initial结构表示，而不是Dates的数组。

变化：

let jsondata = try decoder.decode([Dates].self, from: detailData)

为：

let jsondata = try decoder.decode(Initial.self, from: detailData)

Answer 2

请学习理解解码错误信息，它们非常具有描述性。

错误说您要解码数组，但实际对象是字典（目标结构）。

首先看一下JSON的开头

{
  "copyright" : "NHL and the NHL Shield are registered trademarks of the National Hockey League. NHL and NHL team marks are the property of the NHL and its teams. © NHL 2018. All Rights Reserved.",
  "totalItems" : 2,
  "totalEvents" : 0,
  "totalGames" : 2,
  "totalMatches" : 0,
  "wait" : 10,
  "dates" : [ {
    "date" : "2018-05-04",

它以{开头，它是一个字典（数组是[），但是你要解码一个数组（[Dates]），这是错误信息引用的类型不匹配到。

但这只是解决方案的一半。将该行更改为try decoder.decode(Dates.self后，您将收到另一个错误，即密钥copyright没有任何值。

再次查看JSON并将键与struct成员进行比较。成员与JSON键匹配的结构是Initial，您必须使用dates数组填充gameData。

let jsondata = try decoder.decode(Initial.self, from: detailData)
gameData = jsondata.dates

Answer 3

以前从我的两个朋友那里做出正确答案

但你必须做得更好我会为你提供解决方案，让你的代码更干净，并给你一系列的日期

这是你的可编码模型

   import Foundation

struct Initial: Codable {
    let copyright: String
    let totalItems: Int
    let totalEvents: Int
    let totalGames: Int
    let totalMatches: Int
    let wait: Int
    let dates: [Dates]
}

struct Dates: Codable {
    let date: String
    let totalItems: Int
    let totalEvents: Int
    let totalGames: Int
    let totalMatches: Int
    let games: [Game]
}

struct Game: Codable {
    let gamePk: Int
    let link: String
    let gameType: String
    let season: String
    let gameDate: String
    let status: Status
    let teams: Team
    let venue: Venue
    let content: Content
}

struct Status: Codable {
    let abstractGameState: String
    let codedGameState: Int
    let detailedState: String
    let statusCode: Int
    let startTimeTBD: Bool
}

struct Team: Codable {
    let away: Away
    let home: Home
}

struct Away: Codable {
    let leagueRecord: LeagueRecord
    let score: Int
    let team: TeamInfo
}

struct Home: Codable {
    let leagueRecord: LeagueRecord
    let score: Int
    let team: TeamInfo
}

struct LeagueRecord: Codable {
    let wins: Int
    let losses: Int
    let type: String
}

struct TeamInfo: Codable {
    let id: Int
    let name: String
    let link: String
}

struct Venue: Codable {
    let name: String
    let link: String
}

struct Content: Codable {
    let link: String
}

// MARK: Convenience initializers

extension Initial {
    init(data: Data) throws {
        self = try JSONDecoder().decode(Initial.self, from: data)
    }

}

以下是控制器将使解决方案更容易

class ViewController: UIViewController {
    var todaysGamesURL: URL = URL(string: "https://statsapi.web.nhl.com/api/v1/schedule")!

    var gameData: Initial?
    let activityIndicator = UIActivityIndicatorView(activityIndicatorStyle: .gray)





    override func viewDidLoad() {
        super.viewDidLoad()

        self.loadTodaysGames()

    }

        func loadTodaysGames(){
    print("load Games")
    let todaysGamesDatatask = URLSession.shared.dataTask(with: todaysGamesURL, completionHandler: dataLoaded)
    todaysGamesDatatask.resume()
}
func dataLoaded(data:Data?,response:URLResponse?,error:Error?){
    if let detailData = data {
        if  let inital = try? Initial.init(data: detailData){
           print(inital.dates)
        }else{
             // print("Initial")
        }
    }else{
        print(error!)
    }
}

}

debugDescription：“预计会解码Array <any>，但会找到一个字典。”，underlyingError：nil）

3 个答案: