swift - 如何根据 swift 中的随机数生成来显示某个 View ？

Question

我正在关注一个教程，这是 git 上的存储库

我有 7 个 View ，代表骰子。还有 6 个标签，每次按下 dieButtonTapped() 按钮时都会显示随机数。当我按下按钮时，第一个标签会出现，并带有生成的随机数，这很好，但我无法显示适当的 View 。因此，如果随机数是 5，标签中会显示数字 5，并且应该显示 7 个 View 中的 5 个，代表骰子。 它现在所做的是显示与标签上显示的随机数不匹配的随机 View 。

请帮助我更正 func rearrangeDie() 函数，以匹配 func updateScore(roll: Int) 返回的内容。

谢谢! 这是我的代码:

class ViewController: UIViewController {


    @IBOutlet weak var view1: UIView!
    @IBOutlet weak var view2: UIView!
    @IBOutlet weak var view3: UIView!
    @IBOutlet weak var view4: UIView!
    @IBOutlet weak var view5: UIView!
    @IBOutlet weak var view6: UIView!
    @IBOutlet weak var view7: UIView!

    @IBOutlet weak var label1: UILabel!
    @IBOutlet weak var label2: UILabel!
    @IBOutlet weak var label3: UILabel!
    @IBOutlet weak var label4: UILabel!
    @IBOutlet weak var label5: UILabel!
    @IBOutlet weak var label6: UILabel!



    override func viewDidLoad() {
        super.viewDidLoad()

        view1.isHidden = true
        view2.isHidden = true
        view3.isHidden = true
        view4.isHidden = true
        view5.isHidden = true
        view6.isHidden = true
        view7.isHidden = true

        label1.isHidden = true
        label2.isHidden = true
        label3.isHidden = true
        label4.isHidden = true
        label5.isHidden = true
        label6.isHidden = true

    }

    @IBAction func dieButtonTapped(_ sender: AnyObject) {

        rearrangeDie()
        updateScore(roll: randomDiceRoll())
    }

    // Returns back a random Int (1, 2, 3, 4, 5, or 6)
    func randomDiceRoll() -> Int {
        return Int(arc4random_uniform(6) + 1)

    }

    func rearrangeDie() {

        if randomDiceRoll() == 1 {
            view7.isHidden = false
        }
        else if randomDiceRoll() == 2 {
            view2.isHidden = false
            view5.isHidden = false
        }
        else if randomDiceRoll() == 3 {
            view2.isHidden = false
            view7.isHidden = false
            view5.isHidden = false
        }
        else if randomDiceRoll() == 4 {
            view1.isHidden = false
            view2.isHidden = false
            view5.isHidden = false
            view6.isHidden = false
        }
        else if randomDiceRoll() == 5 {
            view1.isHidden = false
            view2.isHidden = false
            view5.isHidden = false
            view6.isHidden = false
            view7.isHidden = false
        }
        else if randomDiceRoll() == 6 {
            view1.isHidden = false
            view2.isHidden = false
            view3.isHidden = false
            view4.isHidden = false
            view5.isHidden = false
            view6.isHidden = false
        }


    }


    func updateScore(roll: Int) {

        let diceScore = String(roll)

        if label1.isHidden {
            label1.text = diceScore
            label1.isHidden = false

        }
        else if label2.isHidden {
            label2.text = diceScore
            label2.isHidden = false

        }
        else if label3.isHidden {
            label3.text = diceScore
            label3.isHidden = false

        }
        else if label4.isHidden {
            label4.text = diceScore
            label4.isHidden = false

        }
        else if label5.isHidden {
            label5.text = diceScore
            label5.isHidden = false

        }
        else if label6.isHidden {
            label6.text = diceScore
            label6.isHidden = false

        }
        else {
            viewDidLoad()
        }
    }
}

Answer 1

每次调用randomDiceRoll()时，基本上都会生成一个新的随机数。将其存储在变量中并在整个 if 语句中访问它。

我还强烈建议以编程方式创建布局并进行认真的重构。

func rearrangeDie() {
    let randomDiceRoll = randomDiceRoll()

    if randomDiceRoll == 1 {
        view7.isHidden = false
    }
    else if randomDiceRoll == 2 {
        view2.isHidden = false
        view5.isHidden = false
    }
    else if randomDiceRoll == 3 {
        view2.isHidden = false
        view7.isHidden = false
        view5.isHidden = false
    }
    else if randomDiceRoll == 4 {
        view1.isHidden = false
        view2.isHidden = false
        view5.isHidden = false
        view6.isHidden = false
    }
    else if randomDiceRoll == 5 {
        view1.isHidden = false
        view2.isHidden = false
        view5.isHidden = false
        view6.isHidden = false
        view7.isHidden = false
    }
    else if randomDiceRoll == 6 {
        view1.isHidden = false
        view2.isHidden = false
        view3.isHidden = false
        view4.isHidden = false
        view5.isHidden = false
        view6.isHidden = false
    }
}