GradientView in Swift/iOS

CustomDarkUIView.swift

import UIKit

class CustomDarkUIView: UIView {

let gradientLayer = CAGradientLayer()

override func layoutSubviews() {

     // resize your layers based on the view's new frame

     super.layoutSubviews()
     gradientLayer.frame = self.bounds
     let color1 = hexStringToUIColor(hex: "498207").cgColor 
     let color2 = hexStringToUIColor(hex: "4C6100").cgColor
  
     gradientLayer.colors = [color1, color2]
     gradientLayer.locations = [0.0, 0.8]
     gradientLayer.startPoint = CGPoint(x: 0, y: 0)
     gradientLayer.endPoint = CGPoint(x: 1, y: 1)

     self.layer.insertSublayer(gradientLayer, at: 0)
}

func hexStringToUIColor (hex:String) -> UIColor {
     var cString:String = hex.trimmingCharacters(in:     .whitespacesAndNewlines).uppercased()

      if (cString.hasPrefix("#")) {
        cString.remove(at: cString.startIndex)
      }

      if ((cString.count) != 6) {
        return UIColor.gray
      }

      var rgbValue:UInt32 = 0
      Scanner(string: cString).scanHexInt32(&rgbValue)
      return UIColor(
      red: CGFloat((rgbValue & 0xFF0000) >> 16) / 255.0,
      green: CGFloat((rgbValue & 0x00FF00) >> 8) / 255.0,
      blue: CGFloat(rgbValue & 0x0000FF) / 255.0,
      alpha: CGFloat(1)
      )
}
}