我想说我是一个学生，并且目前正在学习SWIFT，所以我很想开始学习。我没有100％的理解。
嘿，所以我的按钮一直与代码混在一起。我告诉按钮在单击标签时在标签上显示一条消息，但是它显示了我让另一个按钮执行的其他操作。抱歉，我不知道该怎么解释。
我的顶部按钮（共有四个）显示为“您是对的！”并且还有一个用代码编写的按钮，但是当我按下该按钮时，当我运行该应用程序时，它会显示“ You Are Wrong！”，这是所有其他按钮应该说的。
它是一个带有音乐相关条款的问答游戏。
我尝试更改按钮（1-4）的标签，但是没有用，我还尝试了将它们断开连接，从故事板上删除它们，然后重新添加所有内容，但是那也没有工作。
import UIKit
class QuizVC: UIViewController {
@IBOutlet weak var questionLabel: UILabel!
@IBOutlet weak var answerLabel: UILabel!
@IBOutlet weak var button1: UIButton!
@IBOutlet weak var button2: UIButton!
@IBOutlet weak var button3: UIButton!
@IBOutlet weak var button4: UIButton!
@IBOutlet weak var Next: UIButton!
var CorrectAnswer = String()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
RandomQuestions()
}
func RandomQuestions() {
var RandomNumber = arc4random() % 5
var RandomQuestion = arc4random() % 4
RandomQuestion += 1
RandomNumber += 1
Next.isHidden = true
switch(RandomNumber) {
case 1:
if RandomQuestion == UInt32(1) {
questionLabel.text = "What is the tail end of a piece of music?"
button1.setTitle("Coda", for: UIControl.State.normal)
button2.setTitle("Da Capo", for: UIControl.State.normal)
button3.setTitle("Forte", for: UIControl.State.normal)
button4.setTitle("Largo", for: UIControl.State.normal)
CorrectAnswer = "1"
} else if RandomQuestion == UInt32(2) {
questionLabel.text = "What is the tail end of a piece of music?"
button1.setTitle("Da Capo", for: UIControl.State.normal)
button2.setTitle("Largo", for: UIControl.State.normal)
button3.setTitle("Coda", for: UIControl.State.normal)
button4.setTitle("Forte", for: UIControl.State.normal)
CorrectAnswer = "3"
} else if RandomQuestion == UInt32(3) {
questionLabel.text = "What is the tail end of a piece of music?"
button1.setTitle("Largo", for: UIControl.State.normal)
button2.setTitle("Da Capo", for: UIControl.State.normal)
button3.setTitle("Forte", for: UIControl.State.normal)
button4.setTitle("Coda", for: UIControl.State.normal)
CorrectAnswer = "4"
} else {
questionLabel.text = "What is the tail end of a piece of music?"
button1.setTitle("Largo", for: UIControl.State.normal)
button2.setTitle("Coda", for: UIControl.State.normal)
button3.setTitle("Forte", for: UIControl.State.normal)
button4.setTitle("Da Capo", for: UIControl.State.normal)
CorrectAnswer = "2"
}
break
case 2:
if RandomQuestion == UInt32(1) {
questionLabel.text = "Another name for Majestically?"
button1.setTitle("Lunga", for: UIControl.State.normal)
button2.setTitle("Dolce", for: UIControl.State.normal)
button3.setTitle("Maestoso", for: UIControl.State.normal)
button4.setTitle("Molto", for: UIControl.State.normal)
CorrectAnswer = "3"
} else if RandomQuestion == UInt32(2) {
questionLabel.text = "Another name for Majestically?"
button1.setTitle("Dolce", for: UIControl.State.normal)
button2.setTitle("Lunga", for: UIControl.State.normal)
button3.setTitle("Molto", for: UIControl.State.normal)
button4.setTitle("Maestoso", for: UIControl.State.normal)
CorrectAnswer = "4"
} else if RandomQuestion == UInt32(3) {
questionLabel.text = "Another name for Majestically?"
button1.setTitle("Molto", for: UIControl.State.normal)
button2.setTitle("Maestoso", for: UIControl.State.normal)
button3.setTitle("Lunga", for: UIControl.State.normal)
button4.setTitle("Dolce", for: UIControl.State.normal)
CorrectAnswer = "2"
} else {
questionLabel.text = "Another name for Majestically?"
button1.setTitle("Maestoso", for: UIControl.State.normal)
button2.setTitle("Dolce", for: UIControl.State.normal)
button3.setTitle("Lunga", for: UIControl.State.normal)
button4.setTitle("Molto", for: UIControl.State.normal)
CorrectAnswer = "1"
}
break
case 3:
if RandomQuestion == UInt32(1) {
questionLabel.text = "Another name for Time/Speed?"
button1.setTitle("Largo", for: UIControl.State.normal)
button2.setTitle("Soli", for: UIControl.State.normal)
button3.setTitle("Tenuto", for: UIControl.State.normal)
button4.setTitle("Tempo", for: UIControl.State.normal)
CorrectAnswer = "4"
} else if RandomQuestion == UInt32(2) {
questionLabel.text = "Another name for Time/Speed?"
button1.setTitle("Soli", for: UIControl.State.normal)
button2.setTitle("Tenuto", for: UIControl.State.normal)
button3.setTitle("Tempo", for: UIControl.State.normal)
button4.setTitle("Largo", for: UIControl.State.normal)
CorrectAnswer = "3"
} else if RandomQuestion == UInt32(3) {
questionLabel.text = "Another name for Time/Speed?"
button1.setTitle("Tempo", for: UIControl.State.normal)
button2.setTitle("Largo", for: UIControl.State.normal)
button3.setTitle("Soli", for: UIControl.State.normal)
button4.setTitle("Tenuto", for: UIControl.State.normal)
CorrectAnswer = "1"
} else {
questionLabel.text = "Another name for Time/Speed?"
button1.setTitle("Largo", for: UIControl.State.normal)
button2.setTitle("Tempo", for: UIControl.State.normal)
button3.setTitle("Tenuto", for: UIControl.State.normal)
button4.setTitle("Soli", for: UIControl.State.normal)
CorrectAnswer = "2"
}
break
case 4:
if RandomQuestion == UInt32(1) {
questionLabel.text = "Another name for Softly"
button1.setTitle("Piano", for: UIControl.State.normal)
button2.setTitle("Forte", for: UIControl.State.normal)
button3.setTitle("Segno", for: UIControl.State.normal)
button4.setTitle("Tacet", for: UIControl.State.normal)
CorrectAnswer = "1"
} else if RandomQuestion == UInt32(2) {
questionLabel.text = "Another name for Softly"
button1.setTitle("Forte", for: UIControl.State.normal)
button2.setTitle("Tacet", for: UIControl.State.normal)
button3.setTitle("Piano", for: UIControl.State.normal)
button4.setTitle("Segno", for: UIControl.State.normal)
CorrectAnswer = "3"
} else if RandomQuestion == UInt32(3) {
questionLabel.text = "Another name for Softly"
button1.setTitle("Tacet", for: UIControl.State.normal)
button2.setTitle("Segno", for: UIControl.State.normal)
button3.setTitle("Forte", for: UIControl.State.normal)
button4.setTitle("Piano", for: UIControl.State.normal)
CorrectAnswer = "4"
} else {
questionLabel.text = "Another name for Softly"
button1.setTitle("Forte", for: UIControl.State.normal)
button2.setTitle("Piano", for: UIControl.State.normal)
button3.setTitle("Segno", for: UIControl.State.normal)
button4.setTitle("Tacet", for: UIControl.State.normal)
CorrectAnswer = "2"
}
break
case 5:
if RandomQuestion == UInt32(1) {
questionLabel.text = "Another name for Really Fast?"
button1.setTitle("Staccato", for: UIControl.State.normal)
button2.setTitle("Fermata", for: UIControl.State.normal)
button3.setTitle("Presto", for: UIControl.State.normal)
button4.setTitle("Mezzo", for: UIControl.State.normal)
CorrectAnswer = "3"
} else if RandomQuestion == UInt32(2) {
questionLabel.text = "Another name for Really Fast?"
button1.setTitle("Fermata", for: UIControl.State.normal)
button2.setTitle("Presto", for: UIControl.State.normal)
button3.setTitle("Staccato", for: UIControl.State.normal)
button4.setTitle("Mezzo", for: UIControl.State.normal)
CorrectAnswer = "2"
} else if RandomQuestion == UInt32(3) {
questionLabel.text = "Another name for Really Fast?"
button1.setTitle("Fermata", for: UIControl.State.normal)
button2.setTitle("Mezzo", for: UIControl.State.normal)
button3.setTitle("Staccato", for: UIControl.State.normal)
button4.setTitle("Presto", for: UIControl.State.normal)
CorrectAnswer = "4"
} else {
questionLabel.text = "Another name for Really Fast?"
button1.setTitle("Presto", for: UIControl.State.normal)
button2.setTitle("Mezzo", for: UIControl.State.normal)
button3.setTitle("Staccato", for: UIControl.State.normal)
button4.setTitle("Fermata", for: UIControl.State.normal)
CorrectAnswer = "1"
}
default:
break
}
}
@IBAction func NextAction(_ sender: Any) {
RandomQuestions()
answerLabel.text = ""
}
@IBAction func button1Action(_ sender: Any) {
if (CorrectAnswer == "1"){
answerLabel.text = "You Are Correct!"
Next.isHidden = false
} else {
answerLabel.text = "You Are Wrong!"
Next.isHidden = true
}
}
@IBAction func button2Action(_ sender: Any) {
if (CorrectAnswer == "2"){
answerLabel.text = "You Are Correct!"
Next.isHidden = false
} else {
answerLabel.text = "You Are Wrong!"
Next.isHidden = true
}
}
@IBAction func button3Action(_ sender: Any) {
if (CorrectAnswer == "3"){
answerLabel.text = "You Are Correct!"
Next.isHidden = false
} else {
answerLabel.text = "You Are Wrong!"
Next.isHidden = true
}
}
@IBAction func button4Action(_ sender: Any) {
if (CorrectAnswer == "4"){
answerLabel.text = "You Are Correct!"
Next.isHidden = false
} else {
answerLabel.text = "You Are Wrong!"
Next.isHidden = true
}
}
}
为什么会这样？我该如何解决？ 我浏览了一下代码，没有看到任何错误，但是我可能只是经验不足，无法真正注意到真正的错误。
答案 0 :(得分：1)
您的代码中有很多重复项。如果您使用按钮tag，则可以为所有应答按钮共享@IBAction。另外，如果您shuffle()的答案，您可以消除更多重复的代码。
您对按钮的混淆可能是因为您将按钮意外连接到多个@IBAction。如果在连接后在情节提要中复制按钮，则可能会发生这种情况。然后添加第二个连接导致该按钮调用两个@IBAction。此更新的代码更加简单明了，应该消除这种混淆。
import UIKit
// The format of the data is ["Question", "correct answer", "wrong answer 1", "wrong answer 2",
// "wrong answer 3"]. The answers will be shuffled after a random question has been chosen.
let quizData: [[String]] = [
["What is the tail end of a piece of music?", "Coda", "Da Capo", "Forte", "Largo"],
["Another name for Majestically?", "Maestoso", "Dolce", "Lunga", "Molto"],
["Another name for Time/Speed?", "Tempo", "Largo", "Soli", "Tenuto"],
["Another name for Softly", "Piano", "Forte", "Segno", "Tacet"],
["Another name for Really Fast?", "Presto","Mezzo", "Staccato", "Fermata"]
]
class QuizVC: UIViewController {
@IBOutlet weak var questionLabel: UILabel!
@IBOutlet weak var answerLabel: UILabel!
@IBOutlet weak var button1: UIButton!
@IBOutlet weak var button2: UIButton!
@IBOutlet weak var button3: UIButton!
@IBOutlet weak var button4: UIButton!
@IBOutlet weak var nextButton: UIButton!
var correctAnswer = 0
override func viewDidLoad() {
super.viewDidLoad()
// Set tag for each button. This could also be done in Storyboard
for (idx, button) in [button1, button2, button3, button4].enumerated() {
button?.tag = idx + 1
}
randomQuestions()
}
func randomQuestions() {
// Pick a random question
let questionData = quizData.randomElement()
let rightAnswer = questionData[1]
// Shuffle the answers
let randomAnswers = questionData.dropFirst().shuffled()
// Find out where the correct answer ended up
correctAnswer = randomAnswers.firstIndex(of: rightAnswer)! + 1
questionLabel.text = questionData[0]
for (idx, button) in [button1, button2, button3, button4].enumerated() {
button?.setTitle(randomAnswers[idx], for: .normal)
}
nextButton.isHidden = true
}
@IBAction func nextAction(_ sender: UIButton) {
randomQuestions()
answerLabel.text = ""
}
// Connect buttons 1 through 4 to this action
@IBAction func buttonAction(_ sender: UIButton) {
if correctAnswer == sender.tag {
answerLabel.text = "You Are Correct!"
nextButton.isHidden = false
} else {
answerLabel.text = "You Are Wrong!"
nextButton.isHidden = true
}
}
}