有没有一个函数可以用来查找按下了哪个UIButton并返回true或false

Question

我创建了一个测试测验，其中有3个问题，你必须选择正确的按钮。显示的每个按钮都有一个带有正确答案的选项。因此，假设用户选择正确的按钮，并在调试区域中告知。

然而，我点击哪个按钮并不重要。我得到的答案是一样的，"糟透了"。

有人能帮我吗？

这是我的问题Brain swift文件。

struct Quiz {
let userQuestions = [
Questions(q: "2 + 2", button1: "4", button2: "6", a: "4"),
Questions(q: "20 x 2", button1: "10", button2: "40", a: "40"),
Questions(q: "10 - 5", button1: "3", button2: "5", a: "5")
]
var questionNumber = 0

//Check answers
func checkAnswer(_ userAnswer: String) -> String{

if userAnswer == userQuestions[questionNumber].a {
return "True"
}

else {
return "False"
}
}
}

我的viewController的主要代码。

class ViewController: UIViewController {
@IBOutlet weak var questionLabel: UILabel!
@IBOutlet weak var headerLabel: UILabel!
@IBOutlet weak var leftButtonLabel: UIButton!
@IBOutlet weak var rightButtonLabel: UIButton!

var appQuiz = Quiz()

@IBAction func userAnswerButton(_ sender: UIButton) {
let userAnswer = sender.currentTitle!
let questionAnswer = appQuiz.checkAnswer(userAnswer)

if userAnswer == questionAnswer {
print("True")
}
else {
print("sucks")
}
appQuiz.getNextQuestion()
nextQuestion()
}

func nextQuestion(){
headerLabel.text = appQuiz.getQuestionText()
questionLabel.text = appQuiz.getQuestionAmount()
leftButtonLabel.setTitle(appQuiz.getButtonText1(), for: .normal)
rightButtonLabel.setTitle(appQuiz.getButtonText2(), for: .normal)
}

}

我的问题在这里：

@IBAction func userAnswerButton(_ sender: UIButton) {
let userAnswer = sender.currentTitle!
let questionAnswer = appQuiz.checkAnswer(userAnswer)

if userAnswer == questionAnswer {
print("True")
}
else {
print("sucks")
}
appQuiz.getNextQuestion()
nextQuestion()
}

Answer 1

只需将sender与按钮进行比较：

if sender === leftButtonLabel {
// left clicked
} else {
// right clicked
}

关于你的Questions结构，最好说哪个答案是正确的，而不是重复：

Questions(q: "2 + 2", button1: "4", button2: "6", leftCorrect: true)

然后检查正确答案将按照以下方式进行：

let leftClicked = (sender === leftButtonLabel)
let correct = (leftClicked == userQuestions[questionNumber].leftCorrect)

事实上，对多个答案进行一点扩展，它可能看起来像这样：

Questions(q: "2 + 2", possibleAnswers: ["4", "6"], correctIndex: 0]

带有

struct Questions {
let q: String
let possibleAnswers: [String]
let correctIndex: Int
}

将您的按钮放入阵列：

var answerButtons: [UIButton] {
return [leftButtonLabel, rightButtonLabel]
}

设置问题：

for (possibleAnswer, button) in zip(question.possibleAnswers, buttons) {
button.setTitle(possibleAnswer, for: .normal)
}

检查正确答案：

let buttonIndex = buttons.index(of: sender) ?? 0
let answeredCorrectly = (question.correctIndex == buttonIndex)