swift - 如何比较两个字符串以查看其中一个是否大于另一个

Question

我正在开发一款基本的纸牌游戏。我让用户洗两张牌，我希望能够知道两张牌是否相等，或者一张牌是否大于另一张或小于另一张。目前我只能判断它们是否相等。

   //Randomize Dealer Card
func randomDealerNumber(){

    let randomNumber = arc4random_uniform(8)
    if randomNumber == 0 {

        dealerNum.text = "10"
    } else if randomNumber == 1 {

        dealerNum.text = "1"
    } else if randomNumber == 2 {

        dealerNum.text = "2"
    } else if randomNumber == 3 {

        dealerNum.text = "3"
    } else if randomNumber == 4 {

        dealerNum.text = "4"
    }else if randomNumber == 5 {

        dealerNum.text = "5"
    } else if randomNumber == 6 {

        dealerNum.text = "6"
    } else if randomNumber == 7 {

        dealerNum.text = "7"
    }
}



let playerCard = playerNum.text
let dealerCard = dealerNum.text
if playerCard == dealerCard {
    print("These two strings are considered equal")
}

Answer 1

您不应在 UIControl 中存储值。这些值应该位于代表您的模型的变量中，然后只需比较模型中的值。

我建议将生成的随机值保留为Int，然后比较它们。向其中添加属性观察器 (didSet) 将允许您在设置这些值时设置标签:

class ViewController: UIViewController {
    @IBOutlet weak var dealerNum: UILabel!
    @IBOutlet weak var playerNum: UILabel!

    var dealerCard = 0 {
        didSet {
            dealerNum.text = String(dealerCard)
        }
    }

    var playerCard = 0 {
        didSet {
            playerNum.text = String(playerCard)
        }
    }

    func randomDealerNumber() {
        var randomNumber = Int.random(in: 0...7)
        if randomNumber == 0 {
            randomNumber = 10
        }
        dealerCard = randomNumber
    }

    func compare() {
        if playerCard == dealerCard {
            print("same")
        } else if playerCard < dealerCard {
            print("less than")
        } else {
            print("greater than")
        }
    }
}