Question

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        questionLabel.text = questions[currentQuestionIndex]
    }
}
var questionLabel : UILabel!
var answerLabel: UILabel!

    let questions:  [String] = [
    "What is 7+7?",
    "What is the capital of Vermont?",
    "What is cognac made from?",
    ]
    let answers: [String] = [
    "14",
    "Montpelier",
    "Grapes",
]
    var currentQuestionIndex: Int=0
...
func showNextQuestion(_ sender: UIButton) {
    currentQuestionIndex+=1
    if currentQuestionIndex == questions.count  {
            currentQuestionIndex = 0
        }

        let question:  String = questions[currentQuestionIndex]
        questionLabel.text = question
        answerLabel.text = "???"
}

func showAnswer(_ sender: UIButton)  {
        let answer: String = answers[currentQuestionIndex]
        answerLabel.text = answer
}

该代码将无法生成。每当我尝试在func前面添加“ IBAction”时，都会说它需要替换。下划线标有func，错误为“运算符后的期望表达式”。接下来的错误是func showNextQuestion行。请，谢谢你

Answer 1

请检查以下使用您的函数创建的类</ p>

第1类：ViewController

第2类：具有扩展功能的NewController

import UIKit

/// Option 1
class ViewController: UIViewController {

    /*
     /// Add IBOutlets Here

    */

    /// Your Assigned Properties
    private var questionLabel : UILabel!
    private var answerLabel: UILabel!
    private var currentQuestionIndex: Int = 0

    let questions:  [String] = [
        "What is 7+7?",
        "What is the capital of Vermont?",
        "What is cognac made from?",
        ]

    let answers: [String] = [
        "14",
        "Montpelier",
        "Grapes",
        ]

    override func viewDidLoad() {
        super.viewDidLoad()
        /// Assign Question To Label
        questionLabel.text = questions[currentQuestionIndex]
    }

    /// Take These Functions Inside Your Class
    func showNextQuestion(_ sender: UIButton) {
        currentQuestionIndex+=1
        if currentQuestionIndex == questions.count  {
            currentQuestionIndex = 0
        }

        let question:  String = questions[currentQuestionIndex]
        questionLabel.text = question
        answerLabel.text = "???"
    }

    func showAnswer(_ sender: UIButton)  {
        let answer: String = answers[currentQuestionIndex]
        answerLabel.text = answer
    }
}

/// Option 2
class NewController: UIViewController
{
    /*
     /// Add IBOutlets Here

     */

    /// Your Assigned Properties
    private var questionLabel : UILabel!
    private var answerLabel: UILabel!
    private var currentQuestionIndex: Int = 0

    let questions:  [String] = [
        "What is 7+7?",
        "What is the capital of Vermont?",
        "What is cognac made from?",
        ]

    let answers: [String] = [
        "14",
        "Montpelier",
        "Grapes",
        ]

    override func viewDidLoad() {
        super.viewDidLoad()
        /// Assign Question To Label
        questionLabel.text = questions[currentQuestionIndex]
    }
}

//MARK:- Required Functions
extension NewController {

    /// Or Make Separate Extension of Class and Add Functions there
    func showNextQuestion(_ sender: UIButton) {
        currentQuestionIndex+=1
        if currentQuestionIndex == questions.count  {
            currentQuestionIndex = 0
        }

        let question:  String = questions[currentQuestionIndex]
        questionLabel.text = question
        answerLabel.text = "???"
    }

    func showAnswer(_ sender: UIButton)  {
        let answer: String = answers[currentQuestionIndex]
        answerLabel.text = answer
    }
}

犯了错误您在类外声明了函数

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        questionLabel.text = questions[currentQuestionIndex]
    }
}
/// Here - This is Wrong

正确方法

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        questionLabel.text = questions[currentQuestionIndex]
    }

    /// Functions Need to Be Here
}

我的快速代码怎么了？

1 个答案: