UIView containing a CAGradientLayer that will automatically update in response to changes to light/dark mode

GradientView.swift

//  GradientView.swift
//
//  UIView containing a CAGradientLayer that will automatically update in response to changes to light/dark mode

import UIKit

// MARK: - GradientView
public class GradientView: UIView {
    
    // MARK: GradientView (Initializers)
    
    public init(frame: CGRect,
                colors: [UIColor],
                startPoint: CGPoint,
                endPoint: CGPoint,
                locations: [NSNumber],
                cornerRadius: CGFloat = 0) {
        
        self.colors = colors
        super.init(frame: frame)
        
        layer.cornerRadius = cornerRadius
        
        let cgColors = cgColors(for: colors)
        
        gradientLayer.frame = bounds
        gradientLayer.colors = cgColors
        gradientLayer.startPoint = startPoint
        gradientLayer.endPoint = endPoint
        gradientLayer.locations = locations
        gradientLayer.cornerRadius = layer.cornerRadius
        gradientLayer.masksToBounds = true
        
        layer.addSublayer(gradientLayer)
    }
    
    required init?(coder: NSCoder) { fatalError("init(coder:) has not been implemented") }
    
    // MARK: GradientView (Public Methods)
    
    public override func layoutSublayers(of layer: CALayer) {
        super.layoutSublayers(of: layer)
        gradientLayer.frame = self.bounds
    }
        
    public override func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {
        super.traitCollectionDidChange(previousTraitCollection)
        
        let cgColors = cgColors(for: colors)
        gradientLayer.colors = cgColors
    }
    
    // MARK: GradientView (Private Properties)
    
    private var gradientLayer: CAGradientLayer = CAGradientLayer()
    private let colors: [UIColor]

    // MARK: GradientView (Private Methods)
    
    private func cgColors(for uiColors: [UIColor]) -> [CGColor] {
        return uiColors.map({ $0.cgColor })
    }
}