pictureManager.swift

func getRandomPicture(_ picture: inout UIImage?, titles: inout [String], pictureTitleIndex: inout Int) {
        
        guard let pictures = pictures else {
            return
        }
        
        // kiválasztott kép indexe a `pictures` tömbben
        let selectedPictureIndex = Int.random(in: 0...pictures.count-1)
        //Int(arc4random_uniform(UInt32(pictures.count - 1)))
        
        // tömb a még ki nem választott képcímek indexével
        var rangeArray = [Int]()
        for index in 0..<pictures.count {
            rangeArray.append(index)
        }
        rangeArray.remove(at: selectedPictureIndex)
        print("range array: \(rangeArray)")
        
        // egyedi véletlen képcímek kiválasztása
        var titlesToReturn = [String]()
        for _ in 0..<choices - 1 {
            let randomIndex = Int(arc4random_uniform(UInt32(rangeArray.count - 1)))
            if let randomPicture = pictures[rangeArray[randomIndex]] as? [String : String] {
                titlesToReturn.append(randomPicture["title"]!)
            }
            rangeArray.remove(at: randomIndex)
        }
        print("titles: \(titlesToReturn)")
        
        // választott képcím beszúrása a véletlen képcímek közé, véletlen helyre :)
        pictureTitleIndex = Int(arc4random_uniform(UInt32(choices)))
        if let chosenPicture = pictures[selectedPictureIndex] as? [String: String] {
            titlesToReturn.insert(chosenPicture["title"]!, at: pictureTitleIndex)
            picture = UIImage(named: chosenPicture["image"]!)!
        }
        
        titles = titlesToReturn
    }

pictureManager2.swift

override func viewDidLoad() {
  super.viewDidLoad()

  let pictureManager = (UIApplication.shared.delegate as? AppDelegate)?.pictureManager
  var titles = [String]()

  pictureManager?.getRandomPicture(&baseImage, titles: &titles, pictureTitleIndex: &correctAnswer)

  for index in 1...titles.count {
    let button = view.viewWithTag(index) as? UIButton
    button?.setTitle(titles[index - 1], for: .normal)
  }

  if let baseImage = baseImage {
    let cropSize = CGSize(width: 300, height: 200)
    let cropRect = CGRect(x:CGFloat(Int(arc4random()) % Int(baseImage.size.width - cropSize.width)),
                          y:CGFloat(Int(arc4random()) % Int(baseImage.size.height - cropSize.height)),
                          width:cropSize.width * baseImage.scale,
                          height:cropSize.height * baseImage.scale)
    let croppedImageRef = baseImage.cgImage!.cropping(to: cropRect)
    let croppedImage = UIImage(cgImage: croppedImageRef!, scale: baseImage.scale, orientation: baseImage.imageOrientation)
    pictureView.image = croppedImage
  }
}