无法检查 swift 中的数组范围

Question

我有不同的数组，它们存储不同数量的元素，单击按钮时数组的索引增加 1，元素被添加到另一个数组，我做了数组范围检查，但是这是行不通的。可能是什么问题

xCode 控制台：致命错误：索引超出范围：文件

class ViewController: UIViewController {
    var currentIndex = 0
    var arrayIndex = -1
    var arrayWords: [Words]?  {
        didSet {
            //            wordTextLabel.text = arrayWords?[0].arrayWords?[currentIndex].name
            //            wordImage.image = arrayWords?[0].arrayWords?[currentIndex].image
            //            wordArray.append((arrayWords?[0].arrayWords?[currentIndex])!)
        }
    }

    var testArray = ["Hello","Energy","Disk","Duck","Wafles"]

    var wordArray: [String] = [] //[ArrayWords] = []

    lazy var wordTextLabel: UILabel = {
        let label = UILabel()
        label.text = testArray[currentIndex]//arrayWords?[0].arrayWords?[currentIndex].name
        label.textColor = .white
        label.font = UIFont(name: "OpenSans-ExtraBold", size: 20)
        label.textAlignment = .center
        label.translatesAutoresizingMaskIntoConstraints = false
        label.isUserInteractionEnabled = true
        return label
    }()

    lazy var wordImage: UIImageView = {
        let image = UIImageView()
        image.contentMode = .scaleAspectFit
        image.tintColor = .white
        image.translatesAutoresizingMaskIntoConstraints = false
        return image
    }()

    lazy var button1: UIButton = {
        let button = UIButton()
        button.backgroundColor = .white
        button.setTitle("Good", for: .normal)
        button.setTitleColor(.black, for: .normal)
        button.addTarget(self, action: #selector(buttonAction), for: .touchUpInside)
        button.layer.cornerRadius = 40
        button.clipsToBounds = true
        button.translatesAutoresizingMaskIntoConstraints = false
        return button
    }()

    lazy var button2: UIButton = {
        let button = UIButton()
        button.backgroundColor = .white
        button.setTitle("No", for: .normal)
        button.setTitleColor(.black, for: .normal)
        button.layer.cornerRadius = 40
        button.translatesAutoresizingMaskIntoConstraints = false
        return button
    }()

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

    func setupView() {
        view.setGradient(colorOne: Color.purpleColor, colorTwo: Color.pinkColor,
                         startPoint: CGPoint(x: 1.0, y: 0.1), endPoint: CGPoint(x: 0.1, y: 1.0))
        view.addSubview(wordTextLabel)
        //wordTextLabel.addSubview(wordImage)
        //view.addSubview(wordImage)
        view.addSubview(button1)
        view.addSubview(button2)

        NSLayoutConstraint.activate(NSLayoutConstraint.constraints(withVisualFormat: "H:|-120-[v0]-120-|", metrics: nil, views: ["v0": wordTextLabel]))

        button1.bottomAnchor.constraint(lessThanOrEqualTo: view.bottomAnchor, constant: -40).isActive = true
        button1.leftAnchor.constraint(equalTo: view.leftAnchor, constant: 30).isActive = true
        button1.heightAnchor.constraint(equalToConstant: 80).isActive = true
        button1.widthAnchor.constraint(equalToConstant: 80).isActive = true

        button2.bottomAnchor.constraint(lessThanOrEqualTo: view.bottomAnchor, constant: -40).isActive = true
        button2.rightAnchor.constraint(equalTo: view.rightAnchor, constant: -30).isActive = true
        button2.heightAnchor.constraint(equalToConstant: 80).isActive = true
        button2.widthAnchor.constraint(equalToConstant: 80).isActive = true

        //        wordArray.append((arrayWords?[0].arrayWords?[currentIndex])!)

    }

    @objc func buttonAction(sender: Any!) {
        print("Button tapped")
        action()
    }

    func action() {

        if currentIndex < testArray.count/*arrayWords?[0].arrayWords?.count*/ { //!= 2 // !=
            currentIndex += 1

            arrayIndex += 1
            wordTextLabel.text = testArray[currentIndex]//arrayWords?[0].arrayWords?[currentIndex].name

            wordArray.append(testArray[arrayIndex])//((arrayWords?[0].arrayWords?[arrayIndex])!)

        } else if arrayIndex != 3 {
            arrayIndex += 1
            wordArray.append(testArray[arrayIndex])//((arrayWords?[0].arrayWords?[arrayIndex])!)

        }  

    }

}

Answer 1

如下更改action()，它将正常工作。无需维护两个索引变量，如果没有第二个变量，您也不需要 else if...

func action() {
    if currentIndex < testArray.count {
        wordTextLabel.text = testArray[currentIndex]
        wordArray.append(testArray[currentIndex])
    }
    currentIndex += 1
}

无法检查 swift 中的数组范围

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