StoryBoard View Backgrounds Black instead of gradient after updating Mac and Xcode

It turns out that the errors were related to a class setup for view with gradient background. The class which seems to be unstable in the current xcode was as follows:

import UIKit
@IBDesignable
class GradientView: UIView {
  @IBInspectable var FirstColor: UIColor = UIColor.clear {
    didSet{
    updateView()
    }}
  @IBInspectable var SecondColor: UIColor = UIColor.clear {
    didSet{
      updateView()
    }}
 
  override class var layerClass: AnyClass {
    get {
      return CAGradientLayer.self
    }
  }
  override func awakeFromNib() {
    super.awakeFromNib()
    self.layer.cornerRadius = 12
    self.clipsToBounds = true
    self.layer.borderWidth = 0.5  }

  func updateView() {
    let layer = self.layer as! CAGradientLayer
    layer.colors = [FirstColor.cgColor, SecondColor.cgColor]
    layer.startPoint = CGPoint(x:0.5,y:1.0)
    layer.endPoint = CGPoint(x:0.5,y:0.0)
  }
}
Using a different method for a gradient view class works fine. There seem to be many other issues with displaying storyboard graphics from the previous version of xcode, but none that produce errors, only lack of defintion of the view controllers... The gradient view class that worked is as follows:

class viewGradient: UIView {
  override func awakeFromNib() {
    super.awakeFromNib()
    let gradientLayer = CAGradientLayer()
    gradientLayer.frame = self.bounds
    gradientLayer.colors = [UIColor.white.cgColor,UIColor.lightGray.cgColor,UIColor.systemTeal.cgColor]
    self.layer.insertSublayer(gradientLayer, at: 0)
  }
  }