Error in parsing JSON using codeable [duplicate] - json

Question

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Can comments be used in JSON?
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Closed 4 years ago.
I am trying to pass some data from a JSON file using the new(ish) codeable capability in Swift. I have used the below syntax before without issue. I believe I may have something set up wrong, however, as I can't seem to understand why I keep receiving the below message when the JSON format has been approved by a JSON parser.
The error message:
error:dataCorrupted(Swift.DecodingError.Context(codingPath: [], debugDescription: "The given data was not valid JSON.", underlyingError: Optional(Error Domain=NSCocoaErrorDomain Code=3840 "JSON text did not start with array or object and option to allow fragments not set." UserInfo={NSDebugDescription=JSON text did not start with array or object and option to allow fragments not set.})))
The code in my QuestionFactory file...
class QuestionFactory {
func parseJSON(filename fileName: String) -> Quiz? {
if let url = Bundle.main.url(forResource: fileName, withExtension: "json") {
print(url)
do {
let data = try Data(contentsOf: url)
let decoder = JSONDecoder()
print("data received is \(data.count) bytes:\n\(data)")
print(data)
print(data as NSData)
let jsonData = try decoder.decode(Quiz.self, from: data)
print(jsonData)
} catch {
print("error:\(error)")
}
}
return nil
}
}
The code in my initial ViewController:
class LaunchScreen: UIViewController {
private var quiz: Quiz?
private let jsonFileName = "QuizData"
func viewDidLoad() {
super.viewDidLoad()
createQuiz()
}
private func createQuiz() {
let questionFactory = QuestionFactory()
guard let parsedQuiz = questionFactory.parseJSON(filename: jsonFileName) else {
print("Error creating quiz")
return
}
quiz = parsedQuiz
}
func movesToMainMenuScreen() {
let transition = CATransition()
transition.duration = 1.5
transition.type = kCATransitionFade
self.navigationController?.view.layer.add(transition, forKey:nil)
let mainMenuVC: UIViewController = MainMenuViewController(quiz: quiz!) >> I am receiving an error here as well, perhaps due to my mainMenuVC's required init?
navigationController?.pushViewController(mainMenuVC, animated: false)
}
In my mainMenuViewController:
class mainMenuViewController: UIViewController {
private var quiz: Quiz! {
didSet {
tableViewAdapter = AnswerTableViewAdapter(answers: quiz.questions[0].answers) >> Although, it is not obviously reaching this far to read through the JSON.
}
required init(quiz: Quiz) {
super.init(nibName: nil, bundle: nil)
defer {
self.quiz = quiz
}
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
The JSON looks like this...
{
"questions":[
{
"text": "1. Where will the 2022 World cup be held?",
"answers": [
{
"text": "Qatar",
"isCorrect": true,
"answerType": "2"
},
{
"text": "دولة قطر",
"isCorrect": true,
"answerType": "1"
},
{
"text": "Jamaica",
"isCorrect": false,
"answerType": "0"
},
{
"image":"qatarFlag",
"isCorrect": true,
"answerType": "3"
}
]
}]
}
The Model files....
Quiz.swift
import Foundation
struct Quiz: Decodable {
var questions: [Question]
}
Question.swift
import Foundation
struct Question: Decodable {
var text: String
var answers: [Answer]
}
Answer.swift
import Foundation
struct Answer: Decodable {
var text: String
var image: String
var isCorrect: Bool
var answerType: String
}

Answer 1

There is extra
]
}
added on last two lines remove these both closing brackets and try to parse JSON.
And make your model's properties to optional to avoid nullable crashes.
The Model files....
Quiz.swift
import Foundation
struct Quiz: Decodable {
var questions: [Question]?
}
Question.swift
import Foundation
struct Question: Decodable {
var text: String?
var answers: [Answer]?
}
Answer.swift
import Foundation
struct Answer: Decodable {
var text: String?
var image: String?
var isCorrect: Bool?
var answerType: String?
}