ios - 为什么我不能在按钮操作中使用 var 值？

Question

我想要将值发送到我的按钮...

为什么我不能在按钮操作中使用 quizWord？

出现“使用未解析的标识符...”错误...

    import UIKit

extension Array
{
    /** Randomizes the order of an array's elements. */
    mutating func shuffle()
    {
        for _ in 0..<10
        {
            sort { (_,_) in arc4random() < arc4random() }
        }
    }
}
// random




class QuizViewController: UIViewController {



    var tasks : [Task] = []
    var limitRe:Int = 0
    var cards: [Character] = []
    var quizName = [String]()
    var quizfileName = [String]()

    override func viewDidLoad() {
        super.viewDidLoad()
        //get the data from core data
        getData()

        for q in 0...tasks.count-1 {
            let quiz = tasks[q]
            quizName.append(quiz.name!)
            quizfileName.append(quiz.filename!)
            print(quizName, quizfileName)
        }
        var quizWord = quizName[0]
        var countText: Int = (quizWord.characters.count) - 1

        for _ in 0...countText
        {let index1 = quizWord.index(quizWord.startIndex, offsetBy: limitRe)

            cards.append(quizWord[index1])
            limitRe = limitRe + 1
        }
        cards.shuffle()
        quizPhotoView.image = UIImage(named: "1.jpg")

        if countText >= 0 {lblChar1.text = "\(cards[0])"} else {lblChar1.text = ""}
        if countText >= 1 {lblChar2.text = "\(cards[1])"} else {lblChar2.text = ""}
        if countText >= 2 {lblChar3.text = "\(cards[2])"} else {lblChar3.text = ""}
        if countText >= 3 {lblChar4.text = "\(cards[3])"} else {lblChar4.text = ""}
        if countText >= 4 {lblChar5.text = "\(cards[4])"} else {lblChar5.text = ""}
        if countText >= 5 {lblChar6.text = "\(cards[5])"} else {lblChar6.text = ""}
        if countText >= 6 {lblChar7.text = "\(cards[6])"} else {lblChar7.text = ""}
        if countText >= 7 {lblChar8.text = "\(cards[7])"} else {lblChar8.text = ""}

    }



    @IBOutlet weak var lblChar1: UILabel!
    @IBOutlet weak var lblChar2: UILabel!
    @IBOutlet weak var lblChar3: UILabel!
    @IBOutlet weak var lblChar4: UILabel!
    @IBOutlet weak var lblChar5: UILabel!
    @IBOutlet weak var lblChar6: UILabel!
    @IBOutlet weak var lblChar7: UILabel!
    @IBOutlet weak var lblChar8: UILabel!
    @IBOutlet weak var lblTyped: UILabel!
    @IBOutlet weak var quizPhotoView: UIImageView!


    func getData() {
        let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
        do {
            tasks = try context.fetch(Task.fetchRequest())
        }
        catch {
            print("Failed")
        }
    }


    @IBAction func butChar1(_ sender: UIButton) {
    if (lblTyped.text!.characters.count) > (quizWord.characters.count) - 1 {lblTyped.text = ""}
        lblTyped.text = lblTyped.text! + lblChar1.text!
        if lblTyped.text == quizWord {lblTyped.text = "Good"}}
    @IBAction func butChar2(_ sender: UIButton) {
        if (lblTyped.text!.characters.count) > (quizWord.characters.count) - 1 {lblTyped.text = ""}
        lblTyped.text = lblTyped.text! + lblChar2.text!
        if lblTyped.text == quizWord {lblTyped.text = "Good"}
    }
    @IBAction func butChar3(_ sender: UIButton) {
        if (lblTyped.text!.characters.count) > (quizWord.characters.count) - 1 {lblTyped.text = ""}
        lblTyped.text = lblTyped.text! + lblChar3.text!
        if lblTyped.text == quizWord {lblTyped.text = "Good"}}
    @IBAction func butChar4(_ sender: UIButton) {
        if (lblTyped.text!.characters.count) > (quizWord.characters.count) - 1 {lblTyped.text = ""}
        lblTyped.text = lblTyped.text! + lblChar4.text!
        if lblTyped.text == quizWord {lblTyped.text = "Good"}}
    @IBAction func butChar5(_ sender: UIButton) {
        if (lblTyped.text!.characters.count) > (quizWord.characters.count) - 1 {lblTyped.text = ""}
        lblTyped.text = lblTyped.text! + lblChar5.text!
        if lblTyped.text == quizWord {lblTyped.text = "Good"}}
    @IBAction func butChar6(_ sender: UIButton) {
        if (lblTyped.text!.characters.count) > (quizWord.characters.count) - 1 {lblTyped.text = ""}
        lblTyped.text = lblTyped.text! + lblChar6.text!
        if lblTyped.text == quizWord {lblTyped.text = "Good"}}
    @IBAction func butChar7(_ sender: UIButton) {
        if (lblTyped.text!.characters.count) > (quizWord.characters.count) - 1 {lblTyped.text = ""}
        lblTyped.text = lblTyped.text! + lblChar7.text!
        if lblTyped.text == quizWord {lblTyped.text = "Good"}}
    @IBAction func butChar8(_ sender: UIButton) {
        if (lblTyped.text!.characters.count) > (quizWord.characters.count) - 1 {lblTyped.text = ""}
        lblTyped.text = lblTyped.text! + lblChar8.text!
        if lblTyped.text == quizWord {lblTyped.text = "Good"}}

}

Answer 1

这里您已在 ViewDidLoad 中声明了 quizWord，因此它是一个局部变量，仅在 ViewDidLoad 函数内可用。

如果您希望在整个 viewController QuizViewController 中使用 quizWord，那么您必须在所有函数之外声明它，就像您对 quizfileName 所做的那样>,测验名称等可能就像

   var quizfileName = [String]()
   var quizWord:String?