To change scroll view indicator color

UIKit_ScrollView+IndicatorColor.swift

// MARK: - Extension :: UIScrollViewDelegate ::

extension ViewController: UIScrollViewDelegate {

    func scrollViewDidScroll(_ scrollView: UIScrollView) {
        
        //--- Change Scroll View Indicator Color ---//
        if #available(iOS 13, *) {
            let verticalIndicatorView = (scrollView.subviews[(scrollView.subviews.count - 1)].subviews[0])
            let horizontalIndicatorView = (scrollView.subviews[(scrollView.subviews.count - 2)].subviews[0])
            
            let colors = [UIColor(hex: "#E54F4F")!.cgColor, UIColor(hex: "##E61C1C")!.cgColor, UIColor(hex: "#8E0202")!.cgColor]
            
            verticalIndicatorView.backgroundColor = UIColor.clear
            verticalIndicatorView.setGradient(colors: colors, angle: 90.0)
            
            horizontalIndicatorView.backgroundColor = UIColor.clear
            horizontalIndicatorView.setGradient(colors: colors, angle: 90.0)
            
        } else {
            
            let colors = [UIColor(hex: "#E54F4F")!.cgColor, UIColor(hex: "##E61C1C")!.cgColor, UIColor(hex: "#8E0202")!.cgColor]
            
            if let verticalIndicatorView: UIImageView = (scrollView.subviews[(scrollView.subviews.count - 1)] as? UIImageView) {
                verticalIndicatorView.backgroundColor = UIColor.clear
                verticalIndicatorView.setGradient(colors: colors, angle: 90.0)
            }

            if let horizontalIndicatorView: UIImageView = (scrollView.subviews[(scrollView.subviews.count - 2)] as? UIImageView) {
                horizontalIndicatorView.backgroundColor = UIColor.clear
                horizontalIndicatorView.setGradient(colors: colors, angle: 90.0)
            }
        }
   }
}