UIColor+ColorBlend.swift

extension UIColor {
    /// Blends this color into the specified color, as if this color was overlaid on top of the other at the specified alpha, but our result will instead be opaque. For instance if self was green, and we passed white and 0.1 alpha/opacity, the result would be a light, faded green.
    ///
    /// - Note: This process is also called alpha compositing.
    func blend(intoColor otherColor: UIColor, atOpacity alpha: CGFloat) -> UIColor {
        let sourceRGB = rgb
        let otherRGB = otherColor.rgb
        
        return UIColor(
            red: (sourceRGB.red * alpha) + (otherRGB.red * (1.0 - alpha)),
            green: (sourceRGB.green * alpha) + (otherRGB.green * (1.0 - alpha)),
            blue: (sourceRGB.blue * alpha) + (otherRGB.blue * (1.0 - alpha)),
            alpha: 1.0
        )
    }
    
    var rgb: (red: CGFloat, green: CGFloat, blue: CGFloat) {
        var red: CGFloat = 0.0
        var green: CGFloat = 0.0
        var blue: CGFloat = 0.0
        
        getRed(&red, green: &green, blue: &blue, alpha: nil)
        
        return (red, green, blue)
    }
}

Can be used like:

view.backgroundColor = UIColor(hexcode: "2CB416").blend(intoColor: .white, atAlpha: 0.1)