ios - 生成不重复的随机 UIImage

Question

在我的应用程序项目中，我随机显示了 107 张图像，我设置了一个 for 循环，将所有图像放入一个数组中。然后我采用该数组并选择一个随机索引。该索引与图片相关联，然后当用户向左滑动时该图片会出现在屏幕上。我的问题是，我能否做到这一点，以便我的代码不会重复数组中的相同索引，直到随机选择所有索引(或关闭应用程序之前的数量)。这是我的代码

class ViewController: UIViewController {

var pictureArray: [String] = []
@IBOutlet weak var quoteImage: UIImageView!
override func viewDidLoad() {
    super.viewDidLoad()

    for i in 0...107{
        pictureArray.append("quote\(i).jpg")
        print(pictureArray)
    }

    // Do any additional setup after loading the view, typically from a nib.
    let swipeRecognizer = UISwipeGestureRecognizer(target: self, action: #selector (changeQuotes))
    swipeRecognizer.direction = UISwipeGestureRecognizerDirection.left
    self.view.addGestureRecognizer(swipeRecognizer)
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.

}
override var prefersStatusBarHidden: Bool{
    return true
}


@objc func changeQuotes(){

    let numberOfImages: UInt32 = 107
    let randomIndex = Int(arc4random_uniform(UInt32(pictureArray.count)))
    let imageName = "\(pictureArray[randomIndex])"
    print(imageName)
    quoteImage.image = UIImage(named: imageName)


    }
}

感谢您的帮助!

Answer 1

随机刷新你的数组，然后一张一张地得到“排序”的图像。

extension Sequence {
    func randomSorted() -> [Element] {
        var result = Array(self)
        guard result.count > 1 else { return result }

        for (i, k) in zip(result.indices, stride(from: result.count, to: 1, by: -1)) {
            let newIndex = Int(arc4random_uniform(UInt32(k)))
            if newIndex == i { continue }
            result.swapAt(i, newIndex)
        }
        return result
    }
}