Question

*****问题更新*****我以为我已经找到了所有这些东西，但最后遇到了另外一个问题。我的问题类（见下文）接受一个Int作为参数，以便定义一个＆＃34;答案＆＃34;财产到＆＃34;问题＆＃34;我正在创造的对象。

当我在视图控制器中时，我需要访问此answer属性才能进行检查。在我的checkAnswer函数中，（参见下面视图控制器中的代码）我正在订阅一个名为questionNumber的变量。我知道这是不正确的，我试图访问这个名为＆＃34的参数;正确答案＆＃34;在我的＆＃34;问题＆＃34;的初始化类。

我是不是错了？

感谢上百万人的帮助。

******上一个问题********

我是使用Swift在我的第一个iOS应用上工作的新手。当我尝试让UIButton按下访问捆绑包中的随机声音文件数组时，我遇到了问题。我通过创建文件夹引用将文件添加到我的项目大纲中。

我设置了一个带有＆＃34;问题的模型＆＃34;需要一些参数的文件（不确定我是否正确...）

import Foundation

class Question {

var questionText: URL
var answer: Int

init(text: String, correctAnswer: Int){
    questionText = Bundle.main.url(forResource: text, withExtension: "m4a", subdirectory: "Sounds")!
    answer = correctAnswer

}


}

然后我做了一个＆＃34;问题库＆＃34;文件添加一些属性（即答案Int）

import AVFoundation
import Foundation

class QuestionBank {


var list = [Question]()

init(){

    // creating a quiz item and appending it to the list
    let item = Question(text: "13", correctAnswer: 0)

    // add question to the list of items
    list.append(item)

    //creating the quiz item inside the append function
    list.append(Question(text: "14", correctAnswer: 1))
    list.append(Question(text: "15", correctAnswer: 2))
    list.append(Question(text: "16", correctAnswer: 2))
    list.append(Question(text: "17", correctAnswer: 1))
    list.append(Question(text: "18", correctAnswer: 0))
    list.append(Question(text: "19", correctAnswer: 0))
    list.append(Question(text: "20", correctAnswer: 1))
    list.append(Question(text: "21", correctAnswer: 2))
    list.append(Question(text: "22", correctAnswer: 2))
    list.append(Question(text: "23", correctAnswer: 0))
    list.append(Question(text: "24", correctAnswer: 1))

}

}

我在View Controller中创建了一个处理按钮按下的功能。我在＆＃34;尝试使用audioPlayer ...＆＃34;表示＆＃34;不能转换类型值的问题＆＃39;问题＆＃39;预期的论点＆＃39; URL＆＃39;

func playRandomSound() {


    let sound1URL = allQuestions.list[0].questionText
    let sound2URL = allQuestions.list[1].questionText
    let sound3URL = allQuestions.list[2].questionText
    let sound4URL = allQuestions.list[3].questionText
    let sound5URL = allQuestions.list[4].questionText
    let sound6URL = allQuestions.list[5].questionText
    let sound7URL = allQuestions.list[6].questionText
    let sound8URL = allQuestions.list[7].questionText
    let sound9URL = allQuestions.list[8].questionText
    let sound10URL = allQuestions.list[9].questionText
    let sound11URL = allQuestions.list[10].questionText
    let sound12URL = allQuestions.list[11].questionText

    let soundURLArray = [sound1URL, sound2URL, sound3URL, sound4URL, sound5URL, sound6URL, sound7URL, sound8URL, sound9URL, sound10URL, sound11URL, sound12URL]

    let randNo = Int(arc4random_uniform(UInt32(allQuestions.list.count)))

    do {
        try AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback)
        try AVAudioSession.sharedInstance().setActive(true)
        try audioPlayer = AVAudioPlayer(contentsOf: (soundURLArray[randNo]))
        audioPlayer.prepareToPlay()
        audioPlayer.play()

    } catch {
        print(error)
    }

}

我还创建了一个响应＆＃34;答案＆＃34;我在＆＃34;问题库中创建了＃34;文件...

当我运行应用程序时，答案似乎正在起作用，但它们并不与从该捆绑包中播放的声音文件相关联。

不确定我到底搞砸了什么。

这里是我的View Controller文件中的所有代码供参考：

import UIKit
import AVFoundation

class ViewController: UIViewController {

@IBOutlet weak var feedbackLabel: UILabel!    
@IBOutlet weak var scoreLabel: UILabel!
@IBOutlet weak var playButton: UIButton!
@IBOutlet weak var progressLabel: UILabel!
@IBOutlet weak var progressBar: UIView!


let allQuestions = QuestionBank()
var pickedAnswer: Int?
var questionNumber: Int = 0
var score: Int = 0
var currentQuestion: Question?
var audioPlayer = AVAudioPlayer()

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    feedbackLabel.alpha = 0
    progressBar.alpha = 0


}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}


@IBAction func playButtonPressed(_ sender: UIButton) {

    playRandomSound()
    feedbackLabel.text = "Listen..."
    feedbackLabel.alpha = 1

}

@IBAction func answerButtonPressed(_ sender: UIButton) {


    if sender.tag == 1 {
        pickedAnswer = 0
    } else if sender.tag == 2 {
        pickedAnswer = 1
    } else if sender.tag == 3 {
        pickedAnswer = 2
    }

    progressBar.alpha = 1

    checkAnswer()

    questionNumber += 1

    nextQuestion()

}

func playRandomSound() {


    let sound1URL = allQuestions.list[0].questionText
    let sound2URL = allQuestions.list[1].questionText
    let sound3URL = allQuestions.list[2].questionText
    let sound4URL = allQuestions.list[3].questionText
    let sound5URL = allQuestions.list[4].questionText
    let sound6URL = allQuestions.list[5].questionText
    let sound7URL = allQuestions.list[6].questionText
    let sound8URL = allQuestions.list[7].questionText
    let sound9URL = allQuestions.list[8].questionText
    let sound10URL = allQuestions.list[9].questionText
    let sound11URL = allQuestions.list[10].questionText
    let sound12URL = allQuestions.list[11].questionText

    let soundURLArray = [sound1URL, sound2URL, sound3URL, sound4URL, sound5URL, sound6URL, sound7URL, sound8URL, sound9URL, sound10URL, sound11URL, sound12URL]

    let randNo = Int(arc4random_uniform(UInt32(allQuestions.list.count)))

    do {
        try AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback)
        try AVAudioSession.sharedInstance().setActive(true)
        try audioPlayer = AVAudioPlayer(contentsOf: (soundURLArray[randNo]))
        audioPlayer.prepareToPlay()
        audioPlayer.play()

    } catch {
        print(error)
    }

}

func updateUI() {

    scoreLabel.text = "Score: \(score)"
    progressLabel.text = "Round \(questionNumber) of \(String(allQuestions.list.count))"
    progressBar.frame.size.width = (view.frame.size.width / 12) * CGFloat(questionNumber) //make this dynamic (the 12)
}


func nextQuestion() {

    do{

        updateUI()

            if questionNumber <= allQuestions.list.count - 1 {

            let randNo = Int(arc4random_uniform(UInt32(allQuestions.list.count)))

            currentQuestion = allQuestions.list[randNo]

            try audioPlayer = AVAudioPlayer(contentsOf: (currentQuestion!.questionText))

        }

        else {

            let alert = UIAlertController(title: "Game Over", message: "Start Over?", preferredStyle: .alert)
            let restartAction = UIAlertAction(title: "Restart", style: .default, handler: { (UIAlertAction) in
            self.startOver()
        })

            alert.addAction(restartAction)

            present(alert, animated: true, completion: nil)

        }
    }  catch {
        print (error)


    }

}

func startOver() {

    questionNumber = 0
    feedbackLabel.alpha = 0
    score = 0
    progressBar.alpha = 0
    scoreLabel.text = "0"
    progressLabel.text = "0"

}

func checkAnswer() {


    let correctAnswer = currentQuestion?.answer

    if correctAnswer == pickedAnswer {
        feedbackLabel.text = "You Got it! ✔️"

        score += 1

    } else {

        feedbackLabel.text = "Wrong ✖️"
    }
}   
}

非常感谢任何帮助!!!!

Answer 1

在playRandomSound函数中，您要在allQuestions.list中设置对象的URL，这是一个Question对象列表。您需要获取.questionText属性才能获取路径。像这样：

let sound1URL = allQuestions.list[0].questionText
let sound2URL = allQuestions.list[1].questionText
let sound3URL = allQuestions.list[2].questionText

也在您的问题类中，更改：

var questionText = Bundle.main.paths(forResourcesOfType: "mp3", inDirectory: "Sounds")

为：

var questionText: URL

并将以下内容添加到init（）：

Bundle.main.url(forResource: text, withExtension: "mp3", subdirectory: "Sounds")

目前您正在将questionText设置为包含传入init的文本的String数组。

新的问题类看起来像这样：

class Question {

    var questionText: URL
    let answer: Int

    init(text: String, correctAnswer: Int){
        questionText = Bundle.main.url(forResource: text, withExtension: "mp3", subdirectory: "Sounds")
        answer = correctAnswer
    }
}

关于您的新问题，请尝试通过将其设置为nextQuestion方法来跟踪当前问题：

if questionNumber <= allQuestions.list.count - 1 {
    let randNo = Int(arc4random_uniform(UInt32(allQuestions.list.count)))
    currentQuestion = allQuestions.list[randNo] //Add this line
    try audioPlayer = AVAudioPlayer(contentsOf: currentQuestion.questionText) //You would no longer need the array of all URLs

}

在playRandomSound（）方法中，用相同的方法替换soundArray：

let randNo = Int(arc4random_uniform(UInt32(allQuestions.list.count)))
currentQuestion = allQuestions.list[randNo]

用随机播放声音尝试audioPlayer = AVAudioPlayer（contentsOf：currentQuestion.questionText）

代替soundArray中的条目

然后在checkAnswer中你可以：

let correctAnswer = currentQuestion.answer

而不是基于你的questionNumber变量。

使用UIButton

1 个答案: