ios - Swift - 如何让文本字段在测验中识别多个正确答案？

Question

我正在做一个测验，这个问题有多个正确答案。例如，在下面的代码中，对于“病变的颜色是什么”的问题，正确答案是“粉红色”。但我也希望它认识到红色也将被视为正确答案。有没有办法为一个问题编码多个正确答案？任何帮助将不胜感激。谢谢!

import Foundation

import UIKit

class Case1Q2ViewController: UIViewController, UITextFieldDelegate {

@IBOutlet weak var imageButton: UIButton!
@IBOutlet weak var nextButton: UIButton!
@IBOutlet var questionLabel: UILabel!

@IBOutlet var correctAnswerLabel: UILabel!

@IBOutlet var inputTextField: UITextField!

var enteredAnswer: String?

var correctAnswers = ["Pink", "Red"]

override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.
    NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(Case1Q2ViewController.keyboardWillShow(_:)), name: UIKeyboardWillShowNotification, object: nil)
    NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(Case1Q2ViewController.keyboardWillHide), name: UIKeyboardWillHideNotification, object: nil)

    inputTextField.delegate = self

    titlesForLabels()
    nextButton.enabled = false

    imageButton.layer.cornerRadius = 2;
    imageButton.layer.borderWidth = 2;
    imageButton.layer.borderColor = UIColor.blackColor().CGColor

    questionLabel.layer.cornerRadius = 2;
    questionLabel.layer.borderWidth = 2;
    questionLabel.layer.borderColor = UIColor.blackColor().CGColor

}

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

func titlesForLabels() {
    questionLabel.text = "What is the colour of the lesion(s)?"
    correctAnswerLabel.text = correctAnswers.joinWithSeparator(", ")
    correctAnswerLabel.hidden = true

    inputTextField.text = nil
    inputTextField.enabled = true
}

func keyboardWillShow(notification: NSNotification) {
    let userInfo = notification.userInfo!

    let keyboardFrame = (userInfo[UIKeyboardFrameEndUserInfoKey] as! NSValue).CGRectValue()

    UIView.animateWithDuration(0.1, animations: { () -> Void in
        self.view.frame.origin.y = -keyboardFrame.size.height
    })
}

func keyboardWillHide() {
    UIView.animateWithDuration(0.1, animations: { () -> Void in
        self.view.frame.origin.y = 0
    })
}

func textFieldShouldReturn(textField: UITextField) -> Bool {
    textField.resignFirstResponder()

    enteredAnswer = textField.text

    checkForCorrectAnswer()

    return true
}

func checkForCorrectAnswer() {
    let answer = enteredAnswer!.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceCharacterSet())
    if correctAnswers.contains(answer.lowercaseString) {
        print("Correct")
        correctAnswerLabel.textColor = UIColor.greenColor()
        correctAnswerLabel.text = "Correct!"
        nextButton.enabled = true

    } else {
        print("Wrong Answer")
        correctAnswerLabel.textColor = UIColor.redColor()
        correctAnswerLabel.text = "Incorrect! Please try again"
        nextButton.enabled = false

    }
    correctAnswerLabel.hidden = false
}
override func viewWillAppear(animated: Bool) {
    navigationItem.title = "Case 1: Q2"
}

Answer 1

您可以通过替换 var correctAnswer = "Pink" 来保留一系列正确答案符合 var correctAnswers = ["pink", "red"]

然后，在您的 checkForCorrectAnswer() 中方法，您必须检查正确答案数组是否包含输入的答案:

func checkForCorrectAnswer() {
    let answer = enteredAnswer!.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceCharacterSet())
    if correctAnswers.contains(answer.lowercaseString) {
        // Correct
    } else {
        // Incorrect
    }
}