For when you work with a designer that goes crazy with the shadows

UIView+Shadow.swift

import UIKit

extension UIView {
    func addShadow() {
        layer.shadowColor = UIColor.black.cgColor
        layer.shadowOpacity = 0.15
        layer.shadowOffset = CGSize(width: 0, height: 3.0)
        layer.shadowRadius = 4
        layer.masksToBounds = false
    }

    func addUpwardsShadow() {
        layer.shadowColor = UIColor.black.cgColor
        layer.shadowOpacity = 0.10
        layer.shadowOffset = CGSize(width: 0, height: -3.0)
        layer.shadowRadius = 4
        layer.masksToBounds = false
    }
}