Shadow style

[artemnovichkov]

Add a style for shadows

import UIKit

open class ShadowStyle {

    public var opacity: CGFloat = 0.0
    public var radius: CGFloat = 0.0
    public var offset: CGSize = .zero
    public var color: UIColor = .clear

    var shadow: NSShadow {
        let shadow = NSShadow()
        shadow.shadowBlurRadius = radius
        shadow.shadowOffset = offset
        shadow.shadowColor = color.withAlphaComponent(opacity)
        return shadow
    }
}

// MARK: - Equatable

extension ShadowStyle: Equatable {
    public static func == (lhs: ShadowStyle, rhs: ShadowStyle) -> Bool {
        return lhs.color == rhs.color &&
               lhs.offset == rhs.offset &&
               lhs.radius == rhs.radius &&
               lhs.opacity == rhs.opacity
    }
}