Usage of colorCurves CIFilter

How can I use my RGB Curve points:

let redCurve = [CIVector(x: 0, y: 0), CIVector(x: 0.235, y: 0.152), CIVector(x: 0.5, y: 0.5), CIVector(x: 1, y: 1)]
let greenCurve = [CIVector(x: 0, y: 0), CIVector(x: 0.247, y: 0.196), CIVector(x: 0.5, y: 0.5), CIVector(x: 1, y: 1)]
let blueCurve = [CIVector(x: 0, y: 0), CIVector(x: 0.235, y: 0.184), CIVector(x: 0.466, y: 0.466), CIVector(x: 1, y: 1)]

in colorCurvesFilter which I've found in Apple Docs:

func colorCurves(inputImage: CIImage) -> CIImage {
    let colorCurvesEffect = CIFilter.colorCurves()
    colorCurvesEffect.inputImage = inputImage
    colorCurvesEffect.curvesDomain = CIVector(x: 0, y: 1)
    colorCurvesEffect.curvesData = Data(
        bytes: [Float32]([
            0.0,0.0,0.0,
            0.8,0.8,0.8,
            1.0,1.0,1.0
        ]), count: 36)
    colorCurvesEffect.colorSpace = CGColorSpaceCreateDeviceRGB()
    return colorCurvesEffect.outputImage!
}