尝试在 Xcode 7 (Swift 2) 中为 iOS 移动应用编写验证循环 - 陷入无限循环

Question

我正在尝试创建一个应用程序 (iOS)，其中使用随机数生成器来显示算术问题。随机数生成器将决定用户将执行什么操作（乘法、减法、加法）以及使用哪些操作数。用户可以使用分段控件 select 难度级别。

用户可以尝试 3 次来提供正确答案。用户将他们的答案输入文本字段，然后按下按钮提交他们的答案。如果用户在第三次尝试后仍未正确回答，程序将显示正确答案并显示新问题。

我在编写代码时遇到困难，无法为用户提供三种尝试。截至目前，我已经成功地创建了一个无限循环。下面是我的部分代码（注意：int i 目前是一个全局变量）：

@IBAction func submitAnswer(sender: UIButton) {

    var newAnswer=0

    if enteredAnswer.text!.isEmpty {

        let alert = UIAlertController(title: "Warning!", message: "Please enter an answer.", preferredStyle: UIAlertControllerStyle.Alert)

        let cancelAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.Cancel, handler: nil)
        alert.addAction(cancelAction)

        presentViewController(alert, animated: true, completion: nil)
    }

    else {
        let textAnswer: String = enteredAnswer.text!
        let userAnswer = Int(textAnswer)!

        if correctAnswer != userAnswer && i < 3{
            newAnswer = userAnswer

            while newAnswer != correctAnswer {
                feedback.text = "Try Again!"
                enteredAnswer.text = ""
                newAnswer = Int(textAnswer)!
                i+=1
            }

        }

        if correctAnswer == userAnswer {
            feedback.text = "Correct Answer!"
            enteredAnswer.text = ""
            score += 1
            scoreValue.text = String(score)
            i=0
            setProblem()
        }

        else {
            feedback.text = "The correct answer \n in \n \(correctAnswer)!"
            enteredAnswer.text = ""
            score -= 1
            scoreValue.text = String(score)
            i=0
            setProblem()
        }

    }

}

Answer 1

如果只想中断 while 循环：

     while newAnswer != correctAnswer {
                feedback.text = "Try Again!"
                enteredAnswer.text = ""
                newAnswer = Int(textAnswer)!
                i+=1
                if i == 3 {
                    break
                }
            }

如果你想让你的游戏正常运行：

if newAnswer != correctAnswer {
    feedback.text = "Try Again!"
    enteredAnswer.text = ""
    newAnswer = Int(textAnswer)!
    i+=1
    if (i<3){
        return
    }
}

尝试在 Xcode 7 (Swift 2) 中为 iOS 移动应用编写验证循环 - 陷入无限循环

Trying to write a validation loop in Xcode 7 (Swift 2) for an iOS mobile app - stuck on infinite loop

ios

xcode7

swift2