Convert NSBezierPath to CGPath (Swift 5.1, Xcode 11.3 (11C29))

NSBezierPath+cgPath.swift

extension NSBezierPath {
    
    /// A `CGPath` object representing the current `NSBezierPath`.
    var cgPath: CGPath {
        let path = CGMutablePath()
        let points = UnsafeMutablePointer<NSPoint>.allocate(capacity: 3)

        if elementCount > 0 {
            var didClosePath = true

            for index in 0..<elementCount {
                let pathType = element(at: index, associatedPoints: points)

                switch pathType {
                case .moveTo:
                    path.move(to: points[0])
                case .lineTo:
                    path.addLine(to: points[0])
                    didClosePath = false
                case .curveTo:
                    path.addCurve(to: points[2], control1: points[0], control2: points[1])
                    didClosePath = false
                case .closePath:
                    path.closeSubpath()
                    didClosePath = true
                @unknown default:
                    break
                }
            }

            if !didClosePath { path.closeSubpath() }
        }

        points.deallocate()
        return path
    }
}

If you are targeting macOS 14 then cgPath is already part of the NSBezierPath API - https://developer.apple.com/videos/play/wwdc2023/10054/?time=676

Nice catch! What a time to be alive 😃