Swift extension to get luma value of a UIColor

UIColorExtension.swift

import UIKit

extension UIColor {

    func isLightColor() -> Bool {
        var red : CGFloat = 0
        var green : CGFloat = 0
        var blue : CGFloat = 0
        
        self.getRed(&red, green: nil, blue: nil, alpha: nil)
        self.getRed(nil, green: &green, blue: nil, alpha: nil)
        self.getRed(nil, green: nil, blue: &blue, alpha: nil)
        
        let lumaRed = 0.2126 * Float(red)
        let lumaGreen = 0.7152 * Float(green)
        let lumaBlue = 0.0722 * Float(blue)
        let luma = Float(lumaRed + lumaGreen + lumaBlue)
        
        return luma >= 0.6
    }
}