CGGradient issues with swift 3 [duplicate]

Question

Just in the process of converting my code from swift 2.3 to 3. In the old code I created a gradient through the following code:

        let colours:CFArrayRef = [tColour.CGColor, bColour.CGColor]
        let colorSpace = CGColorSpaceCreateDeviceRGB()
        let gradient = CGGradientCreateWithColors(colorSpace, colours, nil)

When Xcode 8 converted the code it changed it to the following:

    let colours:CFArray = [tColour.cgColor, bColour.cgColor]
    let colorSpace = CGColorSpaceCreateDeviceRGB()
    let gradient = CGGradient(colorsSpace: colorSpace, colors: colours, locations: nil)

However the code produces the following error:

Contextual type 'CFArray' cannot be used with array literal

Can anybody suggest how to convert the code properly.
With thanks
Reza

Answer 1

Cast the type

let colours = [tColour.cgColor, bColour.cgColor] as CFArray
let colorSpace = CGColorSpaceCreateDeviceRGB()
let gradient = CGGradient(colorsSpace: colorSpace, colors: colours , locations: nil)