Cloud moving animation in Swift? Is it possible? - ios

Question

We are following this tutorial to http://www.invasivecode.com/weblog/core-animation-scroll-layer-cascrolllayer
As per their tutorial animation will stop based on the layer bounds reached. How to do the cloud moving animation by using core animation or in Imageview?
Is it possible?
Gif or Lottie animation not needed here, we excepting through code.
Note that we have tried their code and its working but lack is there as i mentioned above.
How to keep on moving animation like cloud does?
Think twice before devoting this question.
Code:
class ViewController: UIViewController {
var translation: CGFloat = 0.0
public var currentWidth : CGFloat = {
let width = UIScreen.main.bounds.width
return width
}()
public var currentHeight : CGFloat = {
let width = UIScreen.main.bounds.height
return width
}()
lazy var scrollLayer : CAScrollLayer = {
let scrollLayer = CAScrollLayer() // 8
scrollLayer.bounds = CGRect(x: 0.0, y: 0.0, width: currentWidth, height: currentHeight) // 9
scrollLayer.position = CGPoint(x: self.view.bounds.size.width/2, y: self.view.bounds.size.height/2) // 10
scrollLayer.borderColor = UIColor.black.cgColor // 11
// scrollLayer.borderWidth = 5.0 // 12
scrollLayer.scrollMode = CAScrollLayerScrollMode.horizontally // 13
return scrollLayer
}()
lazy var displayLink: CADisplayLink = {
let displayLink = CADisplayLink(target: self, selector: #selector(scrollLayerScroll))
if #available(iOS 15.0, *) {
displayLink.preferredFrameRateRange = CAFrameRateRange(minimum: 5.0, maximum: 8.0, __preferred: 6.0)
} else {
displayLink.preferredFramesPerSecond = 5
// Fallback on earlier versions
}
return displayLink
}()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
if let img = UIImage(named: "new") { // 1
let imageSize = img.size
let layer = CALayer() // 2
layer.bounds = CGRect(x: 0.0, y: 0.0, width: currentWidth * 50, height: currentHeight * 5) // 3
// layer.position = CGPoint(x: imageSize.width/2, y: imageSize.height/2) // 4
layer.contents = img.cgImage // 5
view.layer.addSublayer(scrollLayer) // 6
scrollLayer.addSublayer(layer) // 7
}
displayLink.add(to: RunLoop.current, forMode: .common)
}
#objc func scrollLayerScroll() {
let newPoint = CGPoint(x: translation, y: 0.0)
scrollLayer.scroll(newPoint)
translation += 10.0
// if translation > 1600.0 {
//// stopDisplayLink()
// }
}
func stopDisplayLink() {
displayLink.invalidate()
}
}
Here setting width too high for animating the layer extra time
layer.bounds = CGRect(x: 0.0, y: 0.0, width: currentWidth * 50, height: currentHeight * 5) // 3

Answer 1

We ended up with following solution by rob mayoff
Animate infinite scrolling of an image in a seamless loop
Please find the updated code.
class CloudPassingVC: UIViewController {
#IBOutlet weak var imageToAnimate: UIImageView!
var cloudLayer: CALayer? = nil
var cloudLayerAnimation: CABasicAnimation? = nil
override func viewDidLoad() {
super.viewDidLoad()
cloudScroll()
}
func cloudScroll() {
let cloudsImage = UIImage(named: "clouds")
let cloudPattern = UIColor(patternImage: cloudsImage!)
cloudLayer = CALayer()
cloudLayer!.backgroundColor = cloudPattern.cgColor
cloudLayer!.transform = CATransform3DMakeScale(1, -1, 1)
cloudLayer!.anchorPoint = CGPoint(x: 0, y: 1)
let viewSize = imageToAnimate.bounds.size
cloudLayer!.frame = CGRect(x: 0, y: 0, width: (cloudsImage?.size.width ?? 0.0) + viewSize.width, height: viewSize.height)
imageToAnimate.layer.addSublayer(cloudLayer!)
let startPoint = CGPoint.zero
let endPoint = CGPoint(x: -(cloudsImage?.size.width ?? 0.0), y: 0)
cloudLayerAnimation = CABasicAnimation(keyPath: "position")
cloudLayerAnimation!.timingFunction = CAMediaTimingFunction(name: .linear)
cloudLayerAnimation!.fromValue = NSValue(cgPoint: startPoint)
cloudLayerAnimation!.toValue = NSValue(cgPoint: endPoint)
cloudLayerAnimation!.repeatCount = 600
cloudLayerAnimation!.duration = 10.0
applyCloudLayerAnimation()
}
func applyCloudLayerAnimation() {
cloudLayer!.add(cloudLayerAnimation!, forKey: "position")
}
}