swift - 在多个 View Controller 上保存标签中的数据

Question

我在应用程序中有多个 View Controller ，它们代表游戏中的不同级别。

ViewController.swiftSecondViewController.Swift 等

每个不同级别上都有几个按钮，1 是正确答案，2 是不正确答案。在每个 View Controller 上，我还有标签来更新按钮内用户的分数...

@IBAction func buttonCorrect(_ sender: UIButton)
{
cScore +=1
aScore +=1

correctScore.text = NSString(format: "%i", cScore) as String
attemptScore.text = NSString(format: "%i", aScore) as String
}

@IBAction func buttonIncorrect(_ sender: UIButton)
{
cScore +=0
aScore +=1
correctScore.text = NSString(format: "%i", cScore) as String
attemptScore.text = NSString(format: "%i", aScore) as String
}

如何保存此级别生成的数据/数字并将其传递到 SecondViewController.swift？

目的是能够在游戏结束时保存数据，并用它来绘制图表，显示用户对问题的尝试次数与他们获得的实际正确分数的数量？

Answer 1

假设您使用 Storyboard 进行布局，我在下面编写了一个可能的解决方案。基本上，您保留 aScore 和 cScore 的运行总计，并使用prepareForSegue 将运行总计传递到下一个 View Controller 的 aScore 和 cScore 变量。我创建了一个名为proceedToNextLevel 的函数，每当您想要进入下一个级别时都会调用该函数。

1 级 View Controller 看起来像这样:

    class Level1ViewController: UIViewController {
        var cScore = 0
        var aScore = 0

        //call this function when you want to proceed to level 2, connect a segue between your level 1 view controller and level 2 view controller give the segue an identifier "ProceedToLevel2Segue"
        func proceedToNextLevel() {
             performSegue(withIdentifier: "ProceedToLevel2Segue", sender: nil)
        }

        //pass the accumulated aScore and cScore for level 1 to level 2's aScore and cScore
        override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
            let destinationVC = segue.destination as! Level2ViewController

            destinationVC.cScore = self.cScore
            destinationVC.aScore = self.aScore

        }

         @IBAction func buttonCorrect(_ sender: UIButton)
         {
         cScore +=1
         aScore +=1

         correctScore.text = NSString(format: "%i", cScore) as String
         attemptScore.text = NSString(format: "%i", aScore) as String
         }

        @IBAction func buttonIncorrect(_ sender: UIButton)
        {
        cScore +=0
        aScore +=1
        correctScore.text = NSString(format: "%i", cScore) as String
        attemptScore.text = NSString(format: "%i", aScore) as String
        }


    }

您的2级 View Controller 的aScore和cScore将由Level1ViewController中的prepareForSegue方法初始化为您在1级中的总数。如果它们未初始化，则默认为2级 View Controller 中给定的零值。我在 2 级 View Controller 中保留了相同的增加 aScore 和 cScore 的逻辑。

    class Level2ViewController: UIViewController {

        //these will be initialized to the running total of aScore and cScore from level 1
        var cScore: Int!
        var aScore: Int!

        //proceed to level 3
        func proceedToNextLevel() {
             performSegue(withIdentifier: "ProceedToLevel3Segue", sender: nil)
        }

        //the running total for aScore and cScore is passed to level 3
        override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
            let destinationVC = segue.destination as! Level3ViewController

            destinationVC.cScore = self.cScore
            destinationVC.aScore = self.aScore

        }

        //your scoring logic
        @IBAction func buttonCorrect(_ sender: UIButton)
         {
         cScore +=1
         aScore +=1

         correctScore.text = NSString(format: "%i", cScore) as String
         attemptScore.text = NSString(format: "%i", aScore) as String
         }

        @IBAction func buttonIncorrect(_ sender: UIButton)
        {
        cScore +=0
        aScore +=1
        correctScore.text = NSString(format: "%i", cScore) as String
        attemptScore.text = NSString(format: "%i", aScore) as String
        }

   }

然后，您可以使用相同的 segue 技术将最终的 aScore 和 cScore 变量传递到最终的 View Controller 并显示您的图表。

注意:如果您希望保留数据，您可以使用 Realm 或 Core Data 等本地数据库来保存 aScore 和 cScore。然后，您可以在prepareForSegue方法中的 View Controller 之间将已保存对象的主ID作为Int传递，而不是aScore或cScore，并使用主ID在下一个 View Controller 中检索分数。