Question

我的学校项目是一个儿童数学游戏，它可以测试它们，减法和乘法。我有两个与错误相关的VC。我一直存在的错误是，每当我选择任何选项时，它都会忽略所有其他操作，并遵循乘法指令！我已经尝试了一切，我对这个应用程序感到沮丧。

Option_VC

class Option_VC: UIViewController {

var addition_true: Bool = false
var subtract_true: Bool = false
var multiply_true: Bool = false

override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.
}

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


override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if addition_true == true {
        let nextVC: Quiz_VC = segue.destinationViewController as! Quiz_VC
        nextVC.addition_true = true
    }else if subtract_true == true {
        let nextVC: Quiz_VC = segue.destinationViewController as! Quiz_VC
        nextVC.subtract_true = true
    }else {
        let nextVC: Quiz_VC = segue.destinationViewController as! Quiz_VC
        nextVC.multiply_true = true
    }
}

@IBAction func addition_enter(sender: AnyObject) {
    addition_true = true
    multiply_true = false
    subtract_true = false
}

@IBAction func subtract_enter(sender: AnyObject) {
    subtract_true = true
    addition_true = false
    multiply_true = false
}

@IBAction func multiply_enter(sender: AnyObject) {
    multiply_true = true
    addition_true = false
    subtract_true = false
}

}

Quiz_VC

class Quiz_VC: UIViewController {

@IBOutlet var n1_lbl: UILabel!
@IBOutlet var back: UIButton!
@IBOutlet var next: UIButton!
@IBOutlet var enter: UIButton!
@IBOutlet var answer_field: UITextField!
@IBOutlet var symbol_lbl: UILabel!
@IBOutlet var n2_lbl: UILabel!
@IBOutlet var comment_lbl: UILabel!
@IBOutlet var score_lbl: UILabel!
var addition_true: Bool = false
var subtract_true: Bool = false
var multiply_true: Bool = false
var enter_entered_true: Bool = false
var answer: UInt32 = 0
var finalanswer: UInt32 = 0
var n1: UInt32 = 0
var n2: UInt32 = 0
var count = 0
var score = 0
var temp: UInt32 = 0
var operation: String = ""


override func viewDidLoad() {
    super.viewDidLoad()
    back.hidden = true
    next.hidden = true
    if addition_true == true {
        AdditionQuestions()
    }else if subtract_true == true {
        SubtractionQuestions()
    }
    if multiply_true == true && addition_true == false && subtract_true == false{
        MultiplicationQuestions()
    }
}

func Operation() {
    if addition_true == true {
        operation = "1"
    }else if subtract_true == true {
        operation = "2"
    }else  {
        operation = "3"
    }

    switch operation {
    case "1":
        finalanswer = n1 + n2
    case "2":
        finalanswer = n1 - n2
    case "3":
        finalanswer = n1 * n2
    default: break
    }
}

func AdditionQuestions() {
    n1 = arc4random_uniform(9)+1
    n2 = arc4random_uniform(9)+1
    n1_lbl.text = "\(n1)"
    n2_lbl.text = "\(n2)"
    symbol_lbl.text = "+"
    score_lbl.text = ""
    comment_lbl.text = ""
}

func SubtractionQuestions() {
    n1 = arc4random_uniform(9)+1
    n2 = arc4random_uniform(9)+1
    symbol_lbl.text = "-"
    if n2 > n1 {
        temp = n1
        n1 = n2
        n2 = temp
    }
    n1_lbl.text = "\(n1)"
    n2_lbl.text = "\(n2)"
}

func MultiplicationQuestions() {
    n1 = arc4random_uniform(9)+1
    n2 = arc4random_uniform(9)+1
    symbol_lbl.text = "×"
    n1_lbl.text = "\(n1)"
    n2_lbl.text = "\(n2)"
}

func EndQuiz() {
    if count > 3 {
        enter.hidden = true
        next.hidden = true
        back.hidden = false
        score_lbl.text = "Score: \(score)"
        comment_lbl.text = "Completed Quiz"
    }
}

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

@IBAction func enter_entered(sender: AnyObject) {
    if answer_field.text != nil {
        enter_entered_true = true
        answer = UInt32(answer_field.text!)!
        count = count + 1
        Operation()
        if answer != finalanswer {
            comment_lbl.text = "Incorrect"
        } else {
            comment_lbl.text = "Correct"
            score = score + 1
        }
    } else {
        comment_lbl.text = "Enter a number!"
    }
    enter.hidden = true
    next.hidden = false
}

@IBAction func next_entered(sender: AnyObject) {
    if addition_true == true {
        AdditionQuestions()
        comment_lbl.text = ""
    }else if subtract_true == true {
        SubtractionQuestions()
        comment_lbl.text = ""
    }
    if multiply_true == true && addition_true == false && subtract_true == false{
        MultiplicationQuestions()
        comment_lbl.text = ""
    }
    enter.hidden = false
    next.hidden = true
    EndQuiz()
}

}

Answer 1

在Quiz_VC班级更新 viewDidLoad（）

override func viewDidLoad() {
super.viewDidLoad()
back.hidden = true
next.hidden = true
if addition_true == true {
    AdditionQuestions()
}else if subtract_true == true {
    SubtractionQuestions()
}else if multiply_true == true{
    MultiplicationQuestions()
 }
}

和

func Operation() {
if addition_true == true {
    operation = "1"
}else if subtract_true == true {
    operation = "2"
}else if multiply_true == true  {
    operation = "3"
}

switch operation {
case "1":
    finalanswer = n1 + n2
case "2":
    finalanswer = n1 - n2
case "3":
    finalanswer = n1 * n2
default: break
}
}

也

 @IBAction func next_entered(sender: AnyObject) {
if addition_true == true {
    AdditionQuestions()
    comment_lbl.text = ""
}else if subtract_true == true {
    SubtractionQuestions()
    comment_lbl.text = ""
}else if multiply_true == true{
    MultiplicationQuestions()
    comment_lbl.text = ""
}else{
enter.hidden = false
next.hidden = true
EndQuiz()
  }

  }

Answer 2

当您点击其中一个按钮（添加，减去或相乘）时，应用程序会在执行与这些按钮关联的操作之前立即执行prepareForSegue。因此，addition_true，subtraction_true和multiplication_true都是假的，代码会落到设置乘法选项的else子句中。

解决这个问题：

在故事板中，从三个按钮中删除segues。
从第一个视图控制器添加一个segue到第二个视图控制器（控制从第一个视图控制器顶部的黄色圆圈拖动到第二个视图控制器的主体）。
为segue命名（突出显示segue并在Attributes Inspector中为其命名（＆＃34; mainSegue＆＃34;或其他内容））
在您的代码中，将以下行添加到三个操作（addition_enter等）的每一个的末尾：

performSegueWithIdentifier("mainSegue", sender: self)

这将确保在执行按钮操作后调用segue。

Answer 3

我认为你的@IBAction函数没有被连接，或者没有被调用，因为按钮被链接到一个segue。

这意味着所有Bools在prepareForSegue中都是错误的。在这种情况下，该函数中的逻辑设置QuizVC用于乘法（最后一个else子句没有if限定符）。

所以，在故事板中保留segue。在对象检查器（Xcode右侧的面板）中填充segue标识符字符串。例如，使用ADDITION_SEGUE，MULTIPLY_SEGUE，SUBTRACTION_SEGUE。你不必使用大写和下划线，这只是我的习惯。

然后在prepareForSegue中：你可以告诉哪个segue触发了这个动作。在此基础上设置QuizVC上的属性。那么你在OptionVC中根本不需要那些Bools。

在prepareForSegue中：

if segue.identifier == "ADDITION_SEGUE" {
    destinationViewController...
}

如何将枚举放入QuizVC而不是使用Bools：

enum QuizType {
    case Addition, Subtraction, Multiplication
}

从长远来看，这可能会让事情变得容易一些。它有助于您管理状态，因为测验类型只是三者之一。虽然，如果Bools为你工作那么公平。

我需要帮助调试此错误 - 儿童数学测验

3 个答案: