Left and Right arrow scrolling button for horizontal UICollection view

import UIKit

extension CAGradientLayer {

    

    func backgroundGradientColor() -> CAGradientLayer {

        let rightColor = UIColor(red: (210/255.0), green: (210/255.0), blue:(210/255.0), alpha: 1)

        let leftColor = UIColor(red: (230/255.0), green: (230/255.0), blue:(230/255.0), alpha: 0.1)

        let gradientColors: [CGColor] = [rightColor.cgColor, leftColor.cgColor]

        let gradientLayer: CAGradientLayer = CAGradientLayer()

        gradientLayer.colors = gradientColors

        gradientLayer.startPoint = CGPoint(x: 0.0,y :0.0)

        gradientLayer.endPoint = CGPoint(x: 1.0,y :0.0)

        return gradientLayer

        

    }

    

    func backgroundGradientColor2() -> CAGradientLayer {

        let rightColor = UIColor(red: (230/255.0), green: (230/255.0), blue:(230/255.0), alpha: 0.1)

        let leftColor = UIColor(red: (210/255.0), green: (210/255.0), blue:(210/255.0), alpha: 1)

        let gradientColors: [CGColor] = [rightColor.cgColor, leftColor.cgColor]

        let gradientLayer: CAGradientLayer = CAGradientLayer()

        gradientLayer.colors = gradientColors

        gradientLayer.startPoint = CGPoint(x: 0.0,y :0.0)

        gradientLayer.endPoint = CGPoint(x: 1.0,y :0.0)

        return gradientLayer

        

    }

}

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class ViewController: UIViewController{

    

    

    @IBOutlet weak var pickedImaged: UIImageView!

    

    

    @IBOutlet weak var rightarrow: UIButton!

    

    @IBOutlet weak var leftarrow: UIView!

    

    override func viewDidLoad() {

        super.viewDidLoad()

        rightarrowstyle()

        leftarrowstyle()

       

    }

 func rightarrowstyle() {

        let background = CAGradientLayer().backgroundGradientColor2()

        background.frame = self.rightarrow.bounds

        self.rightarrow.layer.insertSublayer(background, at: 0)

    }

    

    func leftarrowstyle() {

        let background = CAGradientLayer().backgroundGradientColor()

        background.frame = self.leftarrow.bounds

        self.leftarrow.layer.insertSublayer(background, at: 0)

    }

}