Swift 剪刀开关

我想做一个简单的石头剪刀游戏。为此，我使用了一个switch语句，但由于某些原因，它不能正常工作

这就是我制作这个小游戏的结构：

石头、剪刀、布有三个按钮，你必须选择一个。 有一个标签告诉对手（计算机）选择了什么，我把它命名为opponentLabel。 有一个标签告诉结果是什么（“例如，你赢了”），我将其命名为resultLabel

它是这样工作的（这就是它的结构）：

然后我写了一个switch语句，把它们放在一起。 问题是，出于某种原因，当我运行应用程序时，如果我选择摇滚乐，一切都很好，但当我选择纸或剪刀时，结果是错误的

例如，如果我选择了纸（a=1），而对手有纸（这意味着随机数恰好是随机数=1），结果标签不是应该的“画”，而是“你输了”：纸和剪刀不起作用！！我做错了什么？ 以下是完整的代码：

import UIKit

class ViewController: UIViewController {


@IBOutlet weak var opponentLabel: UILabel!
@IBOutlet weak var resultLabel: UILabel!
@IBOutlet weak var rockButton: UIButton!
@IBOutlet weak var paperButton: UIButton!
@IBOutlet weak var scissorsButton: UIButton!






override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    Hide()


}

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



func Hide() {
    opponentLabel.hidden = true
    resultLabel.hidden = true
}

func unHide() {
    opponentLabel.hidden = false
    resultLabel.hidden = false
}


var a = Int()

var randomNumber = Int()

func randomChoice() {

    randomNumber = Int(arc4random() % 3)
    NSLog("randomNumber%ld", randomNumber)



}



func gameOn() {

    switch(randomNumber) { 

    case 0:
        opponentLabel.text = "The opponent chose : ROCK"
        if a == 0 {
            resultLabel.text = "DRAW"
        } else {
            if a == 1 {
                resultLabel.text = "YOU WON!"
            }
            if a == 2 {
                resultLabel.text = "YOU LOST!"
                }
        }
        unHide()
        break

    case 1:
        opponentLabel.text = "The opponent chose: PAPER"
        if a == 0 {
            resultLabel.text = "YOU LOST!"
        } else {
            if a == 1 {
                resultLabel.text = "DRAW"
            }
            if a == 2 {
                resultLabel.text = "YOU WON!"
            }
        }
        unHide()
        break

    case 2:
        opponentLabel.text = "The opponent chose: SCISSORS"
        if a == 0 {
            resultLabel.text = "YOU WON!"
        } else {
            if a == 1 {
                resultLabel.text = "YOU LOST!"
            }
            if a == 2 {
                resultLabel.text = "DRAW"
            }
        }
        unHide()
        break

    default:
        break


    }
}


@IBAction func rockButton(sender: AnyObject) {

    a == 0
    randomChoice()
    gameOn()

}


@IBAction func paperButton(sender: AnyObject) {

    a == 1
    randomChoice()
    gameOn()
}



@IBAction func scissorsButton(sender: AnyObject) {

    a == 2
    randomChoice()
    gameOn()

}



}

---

在@iAction函数中，您将“a”与0、1或2进行比较，而不是给“a”该值

---

更改代码，使其不是a==0，而是a=0。对3个@iBaction执行此操作，然后再试一次，它应该可以工作。

谢谢@AEkon！！它奏效了，而且。。我现在学到了一些新东西！您应该避免使用break语句，默认情况除外（因为其中没有任何操作）

import UIKit

class ViewController: UIViewController {


@IBOutlet weak var opponentLabel: UILabel!
@IBOutlet weak var resultLabel: UILabel!
@IBOutlet weak var rockButton: UIButton!
@IBOutlet weak var paperButton: UIButton!
@IBOutlet weak var scissorsButton: UIButton!






override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    Hide()


}

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



func Hide() {
    opponentLabel.hidden = true
    resultLabel.hidden = true
}

func unHide() {
    opponentLabel.hidden = false
    resultLabel.hidden = false
}


var a = Int()

var randomNumber = Int()

func randomChoice() {

    randomNumber = Int(arc4random() % 3)
    NSLog("randomNumber%ld", randomNumber)



}



func gameOn() {

    switch(randomNumber) { 

    case 0:
        opponentLabel.text = "The opponent chose : ROCK"
        if a == 0 {
            resultLabel.text = "DRAW"
        } else {
            if a == 1 {
                resultLabel.text = "YOU WON!"
            }
            if a == 2 {
                resultLabel.text = "YOU LOST!"
                }
        }
        unHide()
        break

    case 1:
        opponentLabel.text = "The opponent chose: PAPER"
        if a == 0 {
            resultLabel.text = "YOU LOST!"
        } else {
            if a == 1 {
                resultLabel.text = "DRAW"
            }
            if a == 2 {
                resultLabel.text = "YOU WON!"
            }
        }
        unHide()
        break

    case 2:
        opponentLabel.text = "The opponent chose: SCISSORS"
        if a == 0 {
            resultLabel.text = "YOU WON!"
        } else {
            if a == 1 {
                resultLabel.text = "YOU LOST!"
            }
            if a == 2 {
                resultLabel.text = "DRAW"
            }
        }
        unHide()
        break

    default:
        break


    }
}


@IBAction func rockButton(sender: AnyObject) {

    a == 0
    randomChoice()
    gameOn()

}


@IBAction func paperButton(sender: AnyObject) {

    a == 1
    randomChoice()
    gameOn()
}



@IBAction func scissorsButton(sender: AnyObject) {

    a == 2
    randomChoice()
    gameOn()

}



}