SketchShadow.swift

import UIKit

// Source: https://sarunw.com/posts/match-view-shadow-to-sketch-shadow/

extension UIView {
    func applySketchShadow(
        color: UIColor = .black,
        alpha: Float = 0.2,
        x: CGFloat = 0,
        y: CGFloat = 2,
        blur: CGFloat = 4,
        spread: CGFloat = 0
    ) {
        layer.shadowColor = color.cgColor
        layer.shadowOpacity = alpha
        layer.shadowOffset = CGSize(width: x, height: y)
        layer.shadowRadius = blur / 2
        if spread == 0 {
            layer.shadowPath = nil
        } else {
            let dx = -spread
            let rect = bounds.insetBy(dx: dx, dy: dx)
            layer.shadowPath = UIBezierPath(rect: rect).cgPath
        }
    }
}