[SOLVED] Creating an Array of CGColors from an Array of UIColors or NSColors

Creating an Array of CGColors from an Array of UIColors or NSColors

I've been testing CAGradientLayer to create gradient colors for iOS and Mac OS X (Cocoa). For example, I have the following lines of code to create gradient colors for iOS.

let gradient: CAGradientLayer = CAGradientLayer()
gradient.frame = view.bounds
gradient.colors = [UIColor.orangeColor().CGColor,UIColor.redColor().CGColor]
gradient.locations = [0.1,0.9]
self.view.layer.insertSublayer(gradient,atIndex:0)

Now, what I have is an array of colors (UIColor or NSColor), depending on the development platform. If I create an array containing UIColor (or NSColor) objects programmatically, starting with

var cArray = [UIColor]()

var cArray = [NSColor]()

, how can I create an array containing CGColors with them? I'm thinking that this topic might be related. One problem is that I don't know how to declare and initialize an array of CGColor objects.

Thank you

Solution

You could do:

extension _ArrayType where Generator.Element == UIColor {
    func CGColors() -> [CGColorRef] {
        var cgColorArray: [CGColorRef] = []

        for color in self {
            cgColorArray.append(color.CGColor)
        }

        return cgColorArray
    }
}

Use it like so:

let colors: [UIColor] = [UIColor.redColor(), UIColor.orangeColor()]
colors.CGColors()

Repeat for NSColor.