Cfrgtkky

I'm using a pod from github called Pastel
https://github.com/cruisediary/Pastel
It allows for an easy gradient color animation for background views. My problem is the animated gradient stops when moving to another UIView and going back to the original. Any idea on how to start and stop this animation while going to other tabs or views?
This is the main part of pod file `
import UIKit

open class PastelView: UIView {

private struct Animation {



    static let keyPath = "colors"



    static let key = "ColorChange"



}









//MARK: - Custom Direction







open var startPoint: CGPoint = PastelPoint.topRight.point



open var endPoint: CGPoint = PastelPoint.bottomLeft.point







open var startPastelPoint = PastelPoint.topRight {



    didSet {



        startPoint = startPastelPoint.point



    }



}







open var endPastelPoint = PastelPoint.bottomLeft {



    didSet {



        endPoint = endPastelPoint.point



    }



}







//MARK: - Custom Duration

open var animationDuration: TimeInterval = 5.0

fileprivate let gradient = CAGradientLayer()

private var currentGradient: Int = 0

private var colors: [UIColor] = [UIColor(red: 156/255, green: 39/255, blue: 176/255, alpha: 1.0),

UIColor(red: 255/255, green: 64/255, blue: 129/255, alpha: 1.0),

UIColor(red: 123/255, green: 31/255, blue: 162/255, alpha: 1.0),

UIColor(red: 32/255, green: 76/255, blue: 255/255, alpha: 1.0),

UIColor(red: 32/255, green: 158/255, blue: 255/255, alpha: 1.0),

UIColor(red: 90/255, green: 120/255, blue: 127/255, alpha: 1.0),

UIColor(red: 58/255, green: 255/255, blue: 217/255, alpha: 1.0)]

public override init(frame: CGRect) {

    super.init(frame: frame)

}

public required init?(coder aDecoder: NSCoder) {

    super.init(coder: aDecoder)

}

open override func awakeFromNib() {

    super.awakeFromNib()

}

open override func layoutSubviews() {

    super.layoutSubviews()

    gradient.frame = bounds

}

public func startAnimation() {

    gradient.removeAllAnimations()

    setup()

    animateGradient()

}

fileprivate func setup() {

    gradient.frame = bounds

    gradient.colors = currentGradientSet()

    gradient.startPoint = startPoint

    gradient.endPoint = endPoint

    gradient.drawsAsynchronously = true

    layer.insertSublayer(gradient, at: 0)

}

fileprivate func currentGradientSet() -> [CGColor] {

    guard colors.count > 0 else { return  }

    return [colors[currentGradient % colors.count].cgColor,

            colors[(currentGradient + 1) % colors.count].cgColor]

}

public func setColors(_ colors: [UIColor]) {

    guard colors.count > 0 else { return }

    self.colors = colors

}

public func setPastelGradient(_ gradient: PastelGradient) {

    setColors(gradient.colors())

}

public func addcolor(_ color: UIColor) {

    self.colors.append(color)

}

func animateGradient() {

    currentGradient += 1

    let animation = CABasicAnimation(keyPath: Animation.keyPath)

    animation.duration = animationDuration

    animation.toValue = currentGradientSet()

    animation.fillMode = kCAFillModeForwards

    animation.isRemovedOnCompletion = false

    animation.delegate = self

    animation.autoreverses = true

    animation.repeatCount = Float.infinity

    gradient.add(animation, forKey: Animation.key)

}

open override func removeFromSuperview() {

    super.removeFromSuperview()

    gradient.removeAllAnimations()

    gradient.removeFromSuperlayer()

extension PastelView: CAAnimationDelegate {

public func animationDidStop(_ anim: CAAnimation, finished flag: Bool) {



    if flag {



        gradient.colors = currentGradientSet()



        animateGradient()



    }

}

and is shown in view controller like

override func viewDidAppear(_ animated: Bool) {



    super.viewDidAppear(animated)



    //Moving Gradient View



    let pastelView = PastelView(frame: view.bounds)







    //MARK: -  Custom Direction







    pastelView.startPastelPoint = .bottomRight



    pastelView.endPastelPoint = .topLeft







    //MARK: -  Custom Duration







    pastelView.animationDuration = 1.60







    //MARK: -  Custom Color







    pastelView.setColors([UIColor(red: 255/255, green: 30/255, blue: 140/255, alpha: 1.0),



                          UIColor(red: 255/255, green: 48/255, blue: 129/255, alpha: 1.0),



                          UIColor(red: 254/255, green: 66/255, blue: 121/255, alpha: 1.0),



                          UIColor(red: 253/255, green: 91/255, blue: 114/255, alpha: 1.0),



                          UIColor(red: 253/255, green: 105/255, blue: 109/255, alpha: 1.0),





                          ])

    pastelView.startAnimation()

    view.insertSubview(pastelView, at: 0) 

}