它的工作方式就像它应该使用一段时间,但最终它崩溃了应用程序.

这是代码：

import Foundation


var cardDeck = Array<PlayingCard>()

class Deck {

    func addCard(card : PlayingCard,atTop : Bool = false){

        if atTop {
            cardDeck.insert(card,atIndex: 0);
        }else{
            cardDeck += card
        }
    }

    func drawRandomCard() -> PlayingCard{
        var card = PlayingCard()
        var randomNumber : Int = Int(arc4random()) % (cardDeck.count - 1)
        card = cardDeck[randomNumber]
        cardDeck.removeAtIndex(randomNumber)
        return card
    }

}