Question

我想创建一个随机数，以显示在应用程序正面的5个UIImage框中。但是，我希望这些数字不总是在同一范围内。例如，下面的代码显示randomPoolBallIndex3的0 ... 9。但是，我希望它显示0到49之间的任何数字，但不要在其他randomPoolBallIndex上重复相同的数字。因此，每按一次该按钮都不会显示，例如1、1、34、35和50，但是每个数字都会不同。

有没有办法做到这一点？

我将每个randomPoolBallIndex的数组从0 ... 49分解，但是现在它们仅显示我设置的范围，虽然解决了复制问题，但我并不完全满意。

下面的代码：

let ballArray = ["poolball1","poolball2","poolball3","poolball4","poolball5","poolball6","poolball7","poolball8","poolball9","poolball10","poolball11","poolball12","poolball13","poolball14","poolball15","poolball16","poolball17","poolball18","poolball19","poolball20","poolball21","poolball22","poolball23","poolball24","poolball25","poolball26","poolball27","poolball28","poolball29","poolball30","poolball31","poolball32","poolball33","poolball34","poolball35","poolball36","poolball37","poolball38","poolball39","poolball40","poolball41","poolball42","poolball43","poolball44","poolball45","poolball46","poolball47","poolball48","poolball49","poolball50"]

var randomPoolBallIndex: Int = 0
var randomPoolBallIndex1: Int = 0
var randomPoolBallIndex2: Int = 0
var randomPoolBallIndex3: Int = 0
var randomPoolBallIndex4: Int = 0
var randomPoolBallIndex5: Int = 0

@IBOutlet weak var poolBallView1: UIImageView!
@IBOutlet weak var poolBallView2: UIImageView!
@IBOutlet weak var poolBallView3: UIImageView!
@IBOutlet weak var poolBallView4: UIImageView!
@IBOutlet weak var poolBallView5: UIImageView!

@IBAction func buttonPressed(_ sender: UIButton) {
    randomPoolBallIndex1 = Int.random(in: 20 ... 29)
    randomPoolBallIndex2 = Int.random(in: 40 ... 49)
    randomPoolBallIndex3 = Int.random(in: 0 ... 9)
    randomPoolBallIndex4 = Int.random(in: 30 ... 39)
    randomPoolBallIndex5 = Int.random(in: 10 ... 19)

    poolBallView1.image = UIImage(named: ballArray[randomPoolBallIndex1])
    poolBallView2.image = UIImage(named: ballArray[randomPoolBallIndex2])
    poolBallView3.image = UIImage(named: ballArray[randomPoolBallIndex3])
    poolBallView4.image = UIImage(named: ballArray[randomPoolBallIndex4])
    poolBallView5.image = UIImage(named: ballArray[randomPoolBallIndex5])

Answer 1

使用随机播放

我想您只需要从ballArray中获得5个不同的随机池球名称即可。因此，您无需生成任何随机数。只需在buttonPressed中，从改组后的ballArray中创建一个常量

let shuffledBallArray = ballArray.shuffled()

现在只需设置如下图像：

poolBallView1.image = UIImage(named: shuffledBallArray[0])
poolBallView2.image = UIImage(named: shuffledBallArray[1])
...

因此，您的buttonPressed操作应如下所示：

@IBAction func buttonPressed(_ sender: UIButton) {

    let shuffledBallArray = ballArray.shuffled()

    poolBallView1.image = UIImage(named: shuffledBallArray[0])
    poolBallView2.image = UIImage(named: shuffledBallArray[1])
    poolBallView3.image = UIImage(named: shuffledBallArray[2])
    poolBallView4.image = UIImage(named: shuffledBallArray[3])
    poolBallView5.image = UIImage(named: shuffledBallArray[4])
}

创建唯一的随机数

或者您可以创建为您提供5个唯一随机数的函数

func generateNumbers(repetitions: Int, maxValue: Int) -> [Int] {

    var numbers = [Int]()

    for _ in 1...repetitions {
        var n: Int
        repeat {
            n = Int.random(in: 1...maxValue)
        } while numbers.contains(n)
        numbers.append(n)
    }

    return numbers
}

在buttonPressed中，只需为此随机数数组创建常量并设置图像，而无需将任何图像名称保存在具有硬编码的50个名称的ballArray中

@IBAction func buttonPressed(_ sender: UIButton) {

    let randomNumbers = generateNumbers(repetitions: 5, maxValue: 50)

    poolBallView1.image = UIImage(named: "poolBall\(randomNumbers[0])")
    poolBallView2.image = UIImage(named: "poolBall\(randomNumbers[1])")
    poolBallView3.image = UIImage(named: "poolBall\(randomNumbers[2])")
    poolBallView4.image = UIImage(named: "poolBall\(randomNumbers[3])")
    poolBallView5.image = UIImage(named: "poolBall\(randomNumbers[4])")
}

Answer 2

创建一个数组。它们允许存储大量数据，您可以引用所有数据。图片相同

var randomPoolBallIndices:[Int]!
@IBOutlet weak var poolBallViews: [UIImageView]! //Look up how to make array from IBOutlets

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    randomPoolBallIndices = Array(repeating: 0, count: 5)
}

@IBAction func buttonPressed(_ sender: UIButton) {

    for index in randomPoolBallIndices.indices {
        let number = Int.random(in: 0 ... 49)
        while (randomPoolBallIndices.contains(number)) {
            number = Int.random(in: 0 ... 49)
        }
        randomPoolBallIndices[index] = number
        poolBallViews[index] = randomPoolBallIndices[index]
    }
}

Answer 3

生成随机数并将其插入Set中。当设置计数达到5时，中断循环。这样，您可以避免重复。然后从集合中创建随机数数组。

Swift中的随机数

3 个答案:

使用随机播放

创建唯一的随机数