Flashing the screen in Swift. Sticking this here because it took me a while to work out the right variable types and casting.

flashScreen.swift

    func flashScreen() {
        let inDuration: CGDisplayFadeInterval = 0.5
        let outDuration: CGDisplayFadeInterval = 0.5
        let color = NSColor.redColor()

        var fadeToken: CGDisplayFadeReservationToken = 0
        let colorToUse = color.colorUsingColorSpaceName(NSCalibratedRGBColorSpace)!
        let err = CGAcquireDisplayFadeReservation(inDuration + outDuration, &fadeToken)
        if Int(err) != Int(kCGErrorSuccess.value) {
            NSLog("Error acquiring fade reservation")
            return
        }
        CGDisplayFade(fadeToken, inDuration,
            0.0 as CGDisplayBlendFraction, 0.2 as CGDisplayBlendFraction,
            Float(colorToUse.redComponent), Float(colorToUse.greenComponent), Float(colorToUse.blueComponent),
            boolean_t(1))
        CGDisplayFade(fadeToken, inDuration,
            0.2 as CGDisplayBlendFraction, 0.0 as CGDisplayBlendFraction,
            Float(colorToUse.redComponent), Float(colorToUse.greenComponent), Float(colorToUse.blueComponent),
            boolean_t(1))
    }

Thank you so much, this is literally the only answer on the internet.

I am getting Use of undeclared type errors. how would i fix this. Sorry I am new to swift