metal-metaballs/PixelImage/UIColor.swift

import UIKit

extension UIColor {
    var components: (red: CGFloat, green: CGFloat, blue: CGFloat, alpha: CGFloat) {
        var r: CGFloat = 0, g: CGFloat = 0, b: CGFloat = 0, a: CGFloat = 0
        getRed(&r, green: &g, blue: &b, alpha: &a)
        return (r, g, b, a)
    }
}

extension UIColor {
    convenience init(red255 red: CGFloat, green: CGFloat, blue: CGFloat, alpha: CGFloat) {
        self.init(red: red / 255, green: green / 255, blue: blue / 255, alpha: alpha / 255)
    }
}