Thread 1 : Fatal error: Index out of range

Question

Hello,

I have error when i launch my apps Here is my code

import Foundation


class Game {
    var score = 0

    private var questions = [Question]()
    private var currentIndex = 0

    var state: State = .ongoing

    enum State {
        case ongoing, over
    }
    var currentQuestion: Question {
        return questions[currentIndex]
    }

     func refresh ( ) {
        score = 0
        currentIndex = 0
        state = .over
    
        QuestionManager.shared.get { ( questions) in
            self.questions = questions
            self.state = .ongoing
            let name = Notification.Name(rawValue: "QuestionsLoaded")
            let notification = Notification(name: name)
            NotificationCenter.default.post(notification)
        
    }
    }
    private func receiveQuestions(_ questions: [Question]) {
        self.questions = questions
        print(questions)
        state = .ongoing
    }
    
    func answerCurrentQuestion(with answer: Bool) {
        if (currentQuestion.isCorrect && answer) || (!currentQuestion.isCorrect && !answer) {
            score += 1
        }
        goToNextQuestion()
    }

    private func goToNextQuestion() {
        if currentIndex < questions.count - 1 {
            currentIndex += 1
        } else {
            finishGame()
        }
    }
    
    private func finishGame() {
        state = .over
    }
}

Thanks for help

Swift

659

Posted by

Kasiano

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Answer 1

Is it line 16?

please show how you populate questions. Clearly it is not correct.

and tell what is the currentIndex value when it crashes as well as the content of the array (insert a print)

Posted by

Claude31

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Answer 2

Hey, yes is at lane 16.

import UIKit

class QuestionManager {
    private let url = URL(string: "https://opentdb.com/api.php?amount=10&type=boolean")!

    static let shared = QuestionManager()
    private init() {}


    func get(completionHandler: @escaping ([Question]) -> ()) {
        let task = URLSession.shared.dataTask(with: self.url) { (data, response, error) in
            guard error == nil else {
                completionHandler([Question]())
                return
            }
            DispatchQueue.main.async {
                completionHandler(self.parse(data: data))
            }
        }
        task.resume()
    }

    private func parse(data: Data?) -> [Question] {
        guard let data = data,
            let serializedJson = try? JSONSerialization.jsonObject(with: data, options: []),
            let parsedJson = serializedJson as? [String: Any],
            let results = parsedJson["results"] as? [[String: Any]] else {
                return [Question] ( )
        }
        return getQuestionsFrom(parsedDatas: results)
    }

    private func getQuestionsFrom(parsedDatas: [[String: Any]]) -> [Question]{
        var retrievedQuestions = [Question]()

        for parsedData in parsedDatas {
            retrievedQuestions.append(getQuestionFrom(parsedData: parsedData))
        }

        return retrievedQuestions
    }

    private func getQuestionFrom(parsedData: [String: Any]) -> Question {
        if let title = parsedData["question"] as? String,
            let answer = parsedData["correct_answer"] as? String {
            return Question(title: String(htmlEncodedString: title)!, isCorrect: (answer == "True"))
        }
        return Question()
    }
}


extension String {

    init?(htmlEncodedString: String) {

        guard let data = htmlEncodedString.data(using: .utf8) else {
            return nil
        }

        let options: [NSAttributedString.DocumentReadingOptionKey: Any] = [
            NSAttributedString.DocumentReadingOptionKey.documentType: NSAttributedString.DocumentType.html,
            NSAttributedString.DocumentReadingOptionKey.characterEncoding: String.Encoding.utf8.rawValue
        ]

        guard let attributedString = try? NSAttributedString(data: data, options: options, documentAttributes: nil) else {
            return nil
        }

        self.init(attributedString.string)
    }
    
}

Posted by

Kasiano

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Thread 1 : Fatal error: Index out of range

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