UIImageView cross-fade slideshow autoplay repeat sample in Swift 3 without rotten pods

FxxK_UR_Bikeshed-discussion_language.swift

class ViewController: UIViewController {
    var imagesArraySlideshow : [UIImage] = []
    var slideShowIndex:NSInteger = 0
    var slideShowMax:NSInteger = 0
    
    var ivSlideshow:UIImageView = UIImageView()
    
    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.

        buildImagesArraySlideshow()

        //slideshow
        self.ivSlideshow = (self.view.viewWithTag(Int(114514)) as? UIImageView)! //SET TAG Int(114514) with your UIImageView
        self.slideShowMax = self.imagesArraySlideshow.count
        DispatchQueue.global(qos: .userInteractive).async (
            execute: {() -> Void in
            while 1 == 1 {
                print ("MAX:"+String(self.slideShowMax))
                
                DispatchQueue.main.async(execute: {() -> Void in
                    let toImage = self.imagesArraySlideshow[self.slideShowIndex]
                    print ("index:"+String(self.slideShowIndex))
                    UIView.transition(
                        with: self.ivSlideshow,
                        duration: 0.3,
                        options: .transitionCrossDissolve,
                        animations: {self.ivSlideshow.image = toImage},
                        completion: nil
                    )
                })
                self.slideShowIndex += 1
                if self.slideShowIndex == self.slideShowMax {
                    self.slideShowIndex = 0
                }
                sleep(3)
            }
        })
    }

    func buildImagesArraySlideshow(){
        // example: localImageFilePath:URL = *URLs FOR SOME LOCAL IMAGE FILES*
      
        // for localImageFilePath in YOURIMAGEGFILES {
        do {
            let imageData = try Data(contentsOf: localImageFilePath)
            imagesArraySlideshow.append(UIImage(data: imageData)!)
        } catch {
            print("Error loading image : \(error)")
        }
        // }
    }
}