Question

除了数组的最后一个元素外，一切都运行良好，我得到了致命错误：当我点击SnapButton时，数组索引超出范围。我试着添加：

//var indexA = getRandomIntFromArray(cardNamesArray)
//var indexB = getRandomIntFromArray(cardNamesArray2)

但我得到的不能用于类型View Controller不确定这意味着什么

var firstRandomNumber = Int()
var secondRandomNumber = Int()

class ViewController: UIViewController {

@IBOutlet weak var FirstCardImageView: UIImageView!
@IBOutlet weak var SecondCardImageView: UIImageView!
@IBOutlet weak var PlayRoundButton: UIButton!
@IBOutlet weak var BackgroundImageView: UIImageView!
@IBOutlet weak var playerScoreLabel: UILabel!

var playerScore: Int = 0

var cardNamesArray = ["acorn", "angry","apple", "rainbow", "sad","boots", "heart", "pumpkin","chestnuts"]
var cardNamesArray2 = ["bellota", "enfadado","manzana", "arcoiris","triste","botas","corazon", "calabaza", "castana"]

  override func viewDidLoad() {

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

}


override func didReceiveMemoryWarning() {

    super.didReceiveMemoryWarning()

    // Dispose of any resources that can be recreated.

}

@IBAction func playRoundTapped(sender: UIButton) {


    firstRandomNumber = GKRandomSource.sharedRandom().nextIntWithUpperBound(cardNamesArray.count)
    FirstCardImageView.image = UIImage(named: cardNamesArray[firstRandomNumber])

    secondRandomNumber = GKRandomSource.sharedRandom().nextIntWithUpperBound(cardNamesArray2.count)
    SecondCardImageView.image = UIImage(named: cardNamesArray2[secondRandomNumber])


}

    func getRandomIntFromArray(array: [String]) -> Int  {

        return GKRandomSource.sharedRandom().nextIntWithUpperBound(cardNamesArray.count)

    }

//var indexA = getRandomIntFromArray(cardNamesArray)
//var indexB = getRandomIntFromArray(cardNamesArray2)



@IBAction func SnapButtonTapped(sender: UIButton) {
    if cardNamesArray.count > 0 {

        if firstRandomNumber == secondRandomNumber {

            cardNamesArray.removeAtIndex(firstRandomNumber)
            cardNamesArray2.removeAtIndex(secondRandomNumber)

            firstRandomNumber = getRandomIntFromArray(cardNamesArray)
            secondRandomNumber = getRandomIntFromArray(cardNamesArray2)


            //on the last element of the array when I click on SnapButtonTapped I get fatal error: Array index out of range
            FirstCardImageView.image = UIImage(named: cardNamesArray[firstRandomNumber])
            SecondCardImageView.image = UIImage(named: cardNamesArray2[secondRandomNumber])
            print(cardNamesArray)


    } else  {
                print("no cards in array")

        }

    }

}

}

Answer 1

您想要从卡中删除图像吗？

如果答案是肯定的，只需将卡片的图像更改为其他内容：

if firstRandomNumber == secondRandomNumber {
        //print("index match")
        //self.playRoundTapped(self.PlayRoundButton) <--- I have tried to recall the playRoundTapped method but it doesn't remove the element and goes crazy

            cardNamesArray.removeAtIndex(firstRandomNumber)<----how can I apply this to a UIImage?
            cardNamesArray2.removeAtIndex(secondRandomNumber)
            FirstCardImageView.image = UIImage(named: "someDefaultImage")
            SecondCardImageView.image = UIImage(named: "someDefaultImage")
        }

Answer 2

您可以在Playground上运行此操作以了解逻辑。

import UIKit
import GameKit

var array1 = ["one", "two"]
var array2 = ["one", "two"]

// Create a helper method to get random int
func getRandomIntFromArray(array: [String]) -> Int {
    return GKRandomSource.sharedRandom().nextIntWithUpperBound(array1.count)
}

var indexA = getRandomIntFromArray(array1)
var indexB = getRandomIntFromArray(array2)

// At snapButtonTapped
// Check the array count first so that you will not get index out of range.
if array1.count > 0 {
    if indexA == indexB {

        // First remove index first
        array1.removeAtIndex(indexA)
        array2.removeAtIndex(indexB)

        // Assign to new random index
        indexA = getRandomIntFromArray(array1)
        indexB = getRandomIntFromArray(array2)

        // After assigned a new random index, set image base on that index
        // FirstCardImageView.image = UIImage(named: array1[indexA])
        // SecondCardImageView.image = UIImage(named: array2[indexB])
    }
} else {
    print("Finished, all array was removed") // Do anything here such as set empty image for FirstCardImageView & SecondCardImageView or success alert.
}

Answer 3

您的数组似乎正在跟踪字符串，而不是图像。

这一行

 SecondCardImageView.image = UIImage(named: secondCardString)

正在创建基于String的图像，该图像未与String引用关联或连接。

如果你想管理图像，你需要保留一组图像而不是字符串。

或者，您可以使用词典Swift Collection Types

使用UIImage从数组中删除索引

3 个答案: