Get the point on a color wheel image for a given color

UIImageView+ColorWheel.swift

extension UIImageView {
    func pointOnColorWheel(for color: UIColor) -> CGPoint? {
        guard let image = self.image else { return nil }

        var hue: CGFloat = 0
        var saturation: CGFloat = 0
        var brightness: CGFloat = 0
        color.getHue(&hue, saturation: &saturation, brightness: &brightness, alpha: nil)

        let width = self.frame.size.width
        let radius = width / 2
        let colorRadius = saturation * radius
        let angle = (1 - hue) * (2 * CGFloat.pi)
        let midX = width / 2
        let midY = self.frame.size.height / 2
        let xOffset = cos(angle) * colorRadius
        let yOffset = sin(angle) * colorRadius
        return CGPoint(x: midX + xOffset, y: midY + yOffset)
    }
}