Question

我编写了一个变量来跟踪迷你游戏中的分数，但是在执行某些代码后它并不能反映更新后的值。

我正在制作一个基本的智力竞赛迷你游戏，该游戏嵌入在iOS应用程序中。它在独立的视图控制器中运行，并且不与应用程序的任何其他部分交互。我的代码没有错误，但是当我尝试将UILabel设置为变量的值时，它没有任何变化...

@IBOutlet weak var imgItemImage: UIImageView!
@IBOutlet weak var lblItemName: UILabel!
@IBOutlet weak var lblScore: UILabel!


@IBAction func btnRedBin(_ sender: Any) {
    trackScore(binChoice: "red")
}

@IBAction func btnYellowBin(_ sender: Any) {
    trackScore(binChoice: "yellow")
}

@IBAction func btnGreenBin(_ sender: Any) {
    trackScore(binChoice: "green")
}


var trashList:[String] = ["Can", "Brick", "Sandwich"]
var itemChoice:Int = 0
var score:Int = 0
var gameRound:Int = 0

func itemChange() {
    if gameRound <= 3 {
        itemChoice = Int.random(in: 0...((trashList.count)-1))
        lblItemName.text = trashList[itemChoice]
        imgItemImage.image = UIImage(named: (trashList[itemChoice]))
    } else {
        lblItemName.text = "You scored \(score) points!"
    }
    gameRound += 1
    lblScore.text = "\(score)"
}

func trackScore(binChoice:String){
    switch trashList{
    case ["Can"]:
        if binChoice == "red"{
            score = score - 1
        } else if binChoice == "yellow" {
            score = score + 10
        } else {
            score = score - 5
        }

    case ["Brick"]:
        if binChoice == "red"{
            score = score + 10
        } else if binChoice == "yellow" {
            score = score - 1
        } else {
            score = score - 5
        }

    case ["Sandwich"]:
        if binChoice == "red"{
            score = score + 10
        } else if binChoice == "yellow" {
            score = score - 1
        } else {
            score = score - 5
        }
    default:
        break
    }
    trashList.remove(at: itemChoice)
    itemChange()
}

我希望当按下按钮（动作）之一时，变量“分数”会发生变化。但是，当我这样做并尝试通过将UILabel“ lblScore”设置为其值进行检查时，我总是得到0。

Answer 1

这就是trackScore函数的外观

func trackScore(binChoice:String){
    switch binChoice:String{
    case "Can":
        if binChoice == "red"{
            score = score - 1
        } else if binChoice == "yellow" {
            score = score + 10
        } else {
            score = score - 5
        }

    case "Brick":
        if binChoice == "red"{
            score = score + 10
        } else if binChoice == "yellow" {
            score = score - 1
        } else {
            score = score - 5
        }

    case "Sandwich":
        if binChoice == "red"{
            score = score + 10
        } else if binChoice == "yellow" {
            score = score - 1
        } else {
            score = score - 5
        }
    default:
        break
    }
    trashList.remove(at: itemChoice)
    itemChange()
}

Answer 2

在trackScore()中，您switch正在trashList上，但是它通常包含多个项目，因此与您的情况不符。

您要：

func trackScore(binChoice:String){
    switch trashList[itemChoice] {
    case "Can":
        if binChoice == "red"{
            score = score - 1
        } else if binChoice == "yellow" {
            score = score + 10
        } else {
            score = score - 5
        }

    case "Brick":
        if binChoice == "red"{
            score = score + 10
        } else if binChoice == "yellow" {
            score = score - 1
        } else {
            score = score - 5
        }

    case "Sandwich":
        if binChoice == "red"{
            score = score + 10
        } else if binChoice == "yellow" {
            score = score - 1
        } else {
            score = score - 5
        }
    default:
        break
    }
    trashList.remove(at: itemChoice)
    itemChange()
}

变量未在iOS应用的分数跟踪系统中更新

2 个答案: